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Inductive Modem Module (IMM) User`s Manual

1. SampleEraseAll Unconditionally erases all samples in Sample Data Allowed from Host Yes IM Yes Group Yes Format sampleeraseall 00sampleeraseall IG1 sampleeraseall Modifies Sample Data Reguires Nothing Effects Erases all Samples in Sample memory Returns lt Executed gt SampleEraseMultiple Erases multiple samples starting with the specified SampleID and including all lower SampleIDs Allowed from Host Yes IM Yes Group No Format sampleerasemultiple FF 00sampleerasemultiple FF Argument A 32 bit hex SampleID must follow the colon Modifies Sample Data Requires Nothing Effects Erases the Sample with specified SampleID and all Samples in Sample Data with lower Sample IDs Returns INVALID ARGUMENT Error if there is not a properly formatted SampleID after the colon Returns INVALID ARGUMENT Error if the specified SampleID does not exist Returns lt Executed gt SampleGetData Retrieves the data of a specified sample in Sample Data Allowed from Host Yes IM Yes Group No Format samplegetdata FF 00samplegetdata FF Argument A 32 bit hex SampleID must follow the colon Modifies Nothing Requires Nothing Effects Returns data Returns INVALID ARGUMENT Error if there is not a properly formatted SampleID after the colon Returns
2. If the Host takes several seconds to enter data as in a typical SampleAdd command the IMM might act on the command stored in its IM receive buffer when it finishes processing the host command This could cause the IMM to send a lt Busy gt reply tens of seconds after the IM command actually arrived This late reply might collide with other signals on the IM line Clearing the IM receive buffer after each host command prevents this problem 19 This test should not interfere with incoming communications from the IM line Section 3 IMM Operating Modes 3 5 Power Cycling IMM The IMM contains EEPROM memory which may be unreliable if power is removed during a write operation The safest way to power down the IMM is to first use RELEASELINE to explicitly terminate the IM session if the IM line was captured then send the PWROFF command wait 100 milliseconds and then disconnect power and set the logic level serial input to floating or logic low state This power off procedure is primarily a concern for applications where the IMM will be power cycled in the field If the IMM is power cycled in the field remove power for at least 15 seconds before re connecting The IMM will not fully power on until the input voltage rises above 6 volts Section 4 Reply Tags and XML like Formatting 4 Reply Tags and XML like Formatting The IMM uses an XML like format to pass information from the IMM to the host in Host Service mode and from the IMM
3. 6 2 Sending Data After capturing the IM line the host may send data to other devices on the line The IMM supports the old ii and ii command formats as well as new serial number and group command addressing schemes See Section 11 IMM Commands for a complete description Note that any outgoing IM command may return a NOT ALLOWED Error if the line is not captured or a FAILED Error and a POWER FAIL Error if the transmit voltage is too low 6 3 Sending Wake up Tone Older IM devices required a wake up tone before they would power up and start receiving data from the IM line The IMM does not wait for a wake up tone but starts receiving as soon as a carrier signal is detected To support legacy devices the host may send a wake up tone to the line with the SendWakeupTone command 6 4 Releasing IM Line After completing a session on the IM line the host device may use the RELEASELINE command to close the IM session RELEASELINE automatically sends PWROFF to the IM line to switch remote IM devices out of receive mode back into Sleep power mode Alternatively the host may send the PwrOff command to the IMM which also causes the IMM to automatically send the power off signal to remote devices and release the IM line if it is captured and then tells the IMM to return to Sleep mode Notes 1 Ifthe IM line is not properly released all IM devices on the mooring stay awake for up to 2 minutes causing an unnecessary drain on their batteries
4. The Inductive Cable Coupler is an electrical device analogous to an antenna which inductively couples the IMM s DPSK Transceiver to an inductive mooring cable If the Inductive Cable Coupler is damaged or incorrectly installed the communications system will not be reliable The IMM has the ability to measure the performance of an assembled cable coupler There are two classes of Inductive Cable Couplers 100 turn and 20 turn The IMM is optimized for low power with the 100 turn coupler but does work with the older 20 turn coupler Although different classes of cable couplers may be used on the same mooring it is generally not recommended The Inductive Cable Coupler is also available in various forms such as for integration with the instrument as in the SBE 37 IM 37 IMP 39 IM 16plus IM or 51 for use as an external coupler as in the connection to a buoy or for use as a test coupler for laboratory testing of the system Note An IMM in the buoy can be operated without a cable coupler if using a direct cable connection configuration this requires an external transformer in place of the cable coupler The detector should be disabled only in an IMM with a host device that initiates all mooring communications This is typical of many buoy controllers Section 2 IMM Conceptual Model 2 1 5 Power Input The IMM may be directly connected to batteries or power may be supplied by the host instrument The IMM will not power u
5. 00txtest Requires Nothing Modifies Nothing Effects Sends 10 seconds of silence followed by 250 U characters at maximum speed followed by 250 U characters at pseudo random intervals Section 12 IMM Commands 11 6 Config Type 2 Set Commands In Config Type 2 all commands that change the Configuration Data begin with the keyword Set and end with followed by some argument All Set command arguments are tested for minimum and maximum values If the argument is a string it is tested for minimum and maximum length If the command contains the keyword Enable then the argument must be 1 or 0 If the argument is not valid the IMM replies with INVALID ARGUMENT Error Some parameters respond with the lt ConfirmationRequired gt tag indicating the command must be repeated to take effect The IMM always sends the lt Executed gt tag even when the parameter is not changed the Executed tag indicates the processing of the command is complete it does not indicate that the command had any effect SetBaudRate x x Baud rate for host communication 1200 2400 4800 9600 192007 Returns ConfirmationRequired tag and Warning tag The IMM goes to sleep after this command is accepted When it is woken up again it uses the new baud rate SetBaudRate is allowed from the host only Factory default is 9600 Baud rate is not affected by a change in Interface mode SetConfigT ype x x 1 Configuration Type 1 SIM Compatibility
6. 29 THost5 29 Timeout tag 16 Timeouts 19 28 TModem2 20 TModem3 20 TModem4 20 V Volatile structures 10 Voltage 59 W Wake up tone 21 23 Waking IMM 23 Warning tag 15 X XML like format 14
7. 0 9 leHostFlagTerm 0 bleSerialIMMWakeup 1 leHostPromptConfirm 1 leHostServeOnPwrup 1 bleAutoIMFlag 1 55 5 Do 2 z Oo nablePrompt 1 nableHostWakeupCR 1 nableHostWakeupBreak 0 nableEcho 1 jo Oo bleSignalDetector 1 bleToneDetect 0 bleFullPwrTX 0 bleBackSpace 1 bleGDataToSample 0 bleStripHostEcho 0 EnableBinaryData 1 SerialType 1 ermToHost 254 TermFromHost 254 SerialBreakLen 5 MaxNumSamples 40 GroupNumber 3 HOSTO 0 HOST1 5 HOST2 1000 HOST3 12000 HOST4 500 HOS 5 ODEM2 500 ODEM3 18000 ODEM4 100 gt ConfigurationData gt Executed gt faa w d Ad 5 o D S w J E e E a a a HO Hd Hd Hd ee A A GetConfigType Get Configuration Type 1 SIM Compatibility 2 Standard IMM Allowed from Host Yes IM Yes Group No Format getconfigtype 00getconfigtype Modifies Nothing Requires Nothing Effects Returns data Returns lt ConfigType T 2 gt Returns lt ConfigType T 1 gt GetEC Get Event Counter values nonzero entries only Allowed from Host Yes IM Yes Group No Format getec 00getec Modifies Nothing Requires Nothing Effects Returns data Returns IMM gt getec lt EventSummary numEvents 187 gt lt EventList DeviceType SBE90554 IMM SerialNumber 700000
8. 0 3 amp hours e Total for 1 year at 1 sample per hour 2 minute receive per sample 0 42 amp hours e Total for 1 year at 6 samples per hour 2 minute receive per sample 1 2 amp hours Some early hardware versions draw 33uA in Sleep mode These devices have serial numbers lt 70000050 Section 14 Firmware Revision History 14 Firmware Revision History Version 1 09 1 Corrected error in samplegetdata caused some sample retrieval errors 2 Added additional data structure protection to IM receive code should have no visible effect Version 1 08 1 Removed testHF code this test code was not supposed to be released 2 Added lt PowerOn gt and lt PowerOff gt tags lt PowerOn gt is sent when IMM enters Host Service Mode lt PowerOff gt is sent when IMM exits Host Service Mode 3 Added SVS monitoring IMM resets immediately if internal supply voltage falls below 2 5V Version 1 07 1 Fixed sample storage error in SampleAddLine AppendLine and GData Sample data was not added correctly Version 1 06 1 Fixed TONE SENT in debuglevel gt 3 sendwakeuptone wasn t in an XML comment Added MLS shortcut for MeasureLineSignal command IMM incorrectly waited for reply to g00 was ok for G00 Added 0 3 second max wait for first sign of standard reply this prevents full TModem2 delay on a quiet line when remote device isn t responding Updated firmware loader Discovery timeout period changed from 5 sec to 8 sec Commands less
9. Do not repeat if more than one IM device is coupled to the line lt WARNING gt lt ConfirmationRequired gt lt Executed gt lt RemoteReply gt lt Executed gt IMM gt id 01 lt RemoteReply gt lt Executed gt lt RemoteReply gt lt Executed gt Init Resets IMM connected to host to factory state Allowed from Host Yes IM No Group No Format init Modifies All IMM settable parameters Serial Type Baud Rate Configuration Data Host File Sample Data GData String Event Counters etc Requires Nothing Effects Resets the IMM to the factory default state Returns WARNING tag Returns ConfirmationRequired tag Example IMM gt init lt WARNING gt IMM will revert to factory state next power after confirm up will use RS232 Serial at 9600 baud Contents of Sample Data and HostFile will be erased Device ID will reset to 00 Event Counters will reset lt WARNING gt lt ConfirmationRequired gt lt Executed gt IMM gt init lt Executed gt CaptureLine Checks for other devices transmitting on IM line and then reserves IM line by transmitting a carrier signal Allowed from Host Yes IM No Group No Format captureline Modifies DPSK Transceiver State Requires Nothing Section 12 IMM Commands Effects Attempts to start transmitting a carrier on the IM line first ch
10. INVALID ARGUMENT Error if the specified SampleID does not exist Returns The data for the specified Sample in a SampleData tag Example IMM gt samplegetdata 22 lt SampleData ID 0x22 LEN 14 CRC 0x0 gt this is a test lt SampleData gt lt Executed gt SampleGetLast Retrieves the data of the most recent sample Allowed from Host Yes IM Yes Group No Format samplegetlast 00samplegetlast Argument none Modifies Nothing Requires Nothing Effects Returns data Returns INVALID ARGUMENT Error if there are no samples in memory Returns The data for the most recent sample in a SampleData tag Example IMM gt samplegetlast lt SampleData ID 0x22 LEN 14 CRC 0x0 gt this is a test lt SampleData gt lt Executed gt SampleGetList Retrieves a list of samples in Sample Data Allowed from Host Yes IM Yes Group No Format samplegetlist 00samplegetlist Section 12 IMM Commands Modifies Nothing Requires Nothing Effects Returns data Returns A SampleList tag with entries sample ID sample size and check sum for each sample in Sample Data Example IMM gt samplegetlist lt SampleList gt lt Sample ID 0x00000022 Len 14 CRC 0x00000000 gt lt Sample ID 0x00000021 Len 14 CRC 0x00000000 gt lt Sa
11. at least 4 characters e MfgDate A string identifying the manufacture date at least 6 characters e FirmwareVersion A string identifying the code version limited to 16 characters e Firmwar Date A string identifying the compilation date limited to 11 characters GetHostFlag Get HostFlag Signal value Allowed from Host Yes IM Yes Group No Format gethostflag 00gethostflag Modifies Nothing Requires Nothing Effects Returns data Returns lt HostFlag F 0 gt Returns lt HostFlag F 1 gt GetHostID Get HostID String Allowed from Host Yes IM Yes Group No Format gethostid 00gethostid Modifies Nothing Requires Nothing Effects Returns data Returns lt HostID gt Host ID not set lt HostID gt GetLineStatus Get status of the IM line captured or idle Allowed from Host Yes IM No Group No Format getlinestatus Modifies Nothing Requires Nothing Effects Returns data Returns lt LineStatus S CAPTURED Returns lt LineStatus S IDLE gt Section 12 IMM Commands GetReply Get the host response to the last GData command Allowed from Host No IM Yes Group No Format 00getreply Modifies Nothing Requires Nothing Effects Returns data Returns lt GDataReply gt the gdata reply lt GDataReply gt Example IMM gt 00getreply lt RemoteReply gt lt GDataReply gt Not Initialized lt GDataReply gt lt Executed gt lt RemoteRepl
12. space where the host may store data for later upload through the Inductive Modem In buoy applications if the host periodically writes to Sample Data the buoy controller can upload the data from the IMM without disturbing the host This data buffering allows host instruments to take measurements and report data independently of the buoy controller s update rate The Sample Data structure allows a variable maximum number of logical Samples up to 40 each containing a variable number of bytes up to the full memory space 16KByte Sample Data is read and write accessible from both the serial port and the inductive modem A Sample Data summary is available with length and checksum for each sample in memory A Sample ID is automatically assigned to each Sample as it is created The Sample ID is a 32 bit unsigned integer starting at 1 and incrementing each time a sample is created There is no way to reset the assignment of Sample IDs in an IMM 2 2 7 GData Reply Buffer GData is a global IM command used to make time synchronized measurements across multiple instruments of different types It allows a single command to initiate a sample even though different host instruments may require different command strings The GData Reply Buffer is a 127 byte buffer that holds the reply to the last GData command GData may also be sent as a group command or addressed to a specific instrument e g IGO GDATA or OOGDATA Note that 00GDATA is generally an err
13. to the remote device in IM Service mode If the IMM connected to a host never operates in Host Service mode the host will never see any XML like tags The XML like format is not used when the IMM forwards incoming commands to a host device or when the IMM relays normal replies from a host device XML like tags are designed to help host programmers identify common IMM responses and Errors with non command specific code The purpose of the similarity to XML is to take advantage of a format already understood by most developers IMM reply tags should not be considered XML 4 1 lt Executed gt Tag The Executed tag indicates the IMM has completed processing the last command It is always the last thing sent by the IMM after processing a command except the prompt and the IMM never sends more than one Executed tag in response to a command If the IMM returns an Executed tag with no Error or ConfirmationRequired tags the command was understood and successfully processed The IMM does not add Executed tags to host responses to commands received from the IM line 4 2 Error Tags Error tags of the form lt Error type Type msg Message gt provide a standard format for the IMM to report error conditions and common negative results Each Error tag contains a type and a message msg The Error type is intended for machine parsing the number of types will be kept to a minimum and tied to the IMM s conceptual model The msg parameter is
14. x 2 Configuration Type 2 Standard 2005 Returns ConfirmationRequired tag and Warning tag This command should not be used after deployment SetConfigType is allowed from the host only Factory default is 2 Config Type 2 Config Type is not affected by a change in Interface mode SetDebugLevel x x 0 Disable all executed and executing tags and remote reply tags x 1 Disable all remote reply tags x 2 Normal operation x 3 For debugging with a terminal program This enables some extra text output lt in XML comment tags gt in response to many commands The existence and content of comment tags is not part of the IMM specification IMM applications should have no dependency on the existence or content of XML comments x 4 9 Factory use only SetDebugLevel is allowed from the host the IM and as a group command Factory default is DebugLevel 2 normal operation DebugLevel is not affected by a change in Interface mode Note THost4 timeouts are reported as Errors only if DebugLevel is set to 6 or higher SetDeviceID x x Device ID 00 99 which is the ii in iit COMMAND or 11 COMMAND SetDevicelD is allowed from the host and the IM Factory default is O Device ID is not affected by a change in Interface mode Two digits are required for ii or Hi commands but the SetDevicelD command does not require two digits SETDEVICEID 01 has the same effect as SETDEVICEID 1 OOGETSD gets the status data of remote device
15. Event Counters It is possible to transmit up to 20KBytes in a reply but we recommend limiting replies to 8KBytes or less to avoid complications 2 3 Volatile Structures Volatile structures are reset when the IMM executes a power on reset 2 3 1 Operating Mode IMM operating mode describes the action the IMM is performing at a particular moment it is not a user settable parameter There are four operating modes Host Service IM Service IM Receive and Sleep Power off might be considered an additional operating mode in some applications The IMM may be configured to enter Sleep mode or Host Service mode on power up 2 3 2 Host Command Buffer The Host Command Buffer is a 127Byte RAM buffer used only during Host Service mode Characters received from the host are stored in this buffer until the termination sequence arrives carriage return followed by line feed as generated by the Enter key on Windows computers When the termination sequence arrives the IMM attempts to execute the contents of the Host Command Buffer as a command All host commands must fit in this buffer or the IMM will generate an error This size limitation does not apply to data sent after executing a command e g the SampleAdd command which prompts for up to 16KBytes of additional data 2 3 3 IM Command Buffer The IM Command Buffer is a 127Byte RAM buffer where incoming commands from the IM line are stored All IM commands must fit in this buffer or the command w
16. Ge ee ee ee ee ee se 23 1 3 DETECTING WAKE UP TONES a 23 TA RECEIVING HOST COMMANDS ii oxi else Se See re Se De EE ese ee Se A tse Se Ee dev ee Se ee OE ad 23 7 4 1 Device ID and Serial Number Addressed Host Commands sessies sees see se ek Se ee ee ee ee ee ee ee 24 7 4 2 Group Addressed and Global Host Commands 00 esse esse esse es see se Ge Ge GR GR GR ee ee ee ee ee ee Ge 24 dO DISABLING SIGNAL DETECTOR Ais ie seep see oe See See AR GE Ge Ee ae LL ee N EE AE ee ed AR ee Ed 24 8 IMM HOST INTERFACE IN IM SERVICE MODE esuese se sees esese sesse se se sees ege gese ese se Se Se oge gese ego ge se be Se ese gese ego se se se se ese 25 Sl WAKING HOST WITH IMM iia Seed be eN ee eg ee De ee gee dose eN aude a Ve bek oe deed es SN Ed ee se ede tee 25 8 1 1 Waking Host with Hardware Handshaking IMElag iese esse ee sees see esse esse ese es se ee se ee se ee se ee se ee Ge ee Ged ede ee ee 25 5 1 2 Wakmge Hostwith a S rial Byte inet a ieee RL ee Dee acid 26 8 1 3 Waking Host with a Serial Break Condition esse esse esse es see se Ge Ge ee ee ee ee ee Ge Ge RA ee ee 26 8 2 CONFIRMING HOST EN EE OR N N OE IE 26 8 2 1 Confirming Host Wake up with HostPrompt iese esse esse esse ee se ee se de ee ee Ge ee ee ee ee ee Ge Ge Ge nccnna ns 26 8 2 2 Confirming Host Wake up with HostFlag Input sesse esse ee se ee se ee ede ee ee ee ee ee ee ee ee Ge Ge Ge GR ee 26 8 3 SENDING COMMAND TO HOST sees ees se se ee ee s
17. SendPwrOff A no no powering off the IMM Line only Note This differs from PwrOff Use this command when transmitting from SendStayOn eap pored no no an IMM Use STAYON when transmitting Line only from a SIM Captured Use this command when transmitting from SendWakeupTone no no an IMM Use PWRON when transmitting Line only from a SIM 1200 2400 4800 9600 19200 SetBaudRate yes no no Confirmation required Returns Warning tag SetConfigType R P io Aa aa required Returns SetDebugLevel yes yes yes 0 9 SetDeviceID yes yes no 0 99 same as SetID SetEnableAutoIMFlag yes yes yes 0 or 1 SetEnableBackSpace yes yes yes 0 or 1 SetEnableBinaryData yes yes yes 0 or 1 SetEnableEcho yes yes yes 0 or 1 SetEnableFullPwrTX yes yes yes 0 or 1 SetEnableGDataToSample yes yes yes 0 or 1 SetEnableHostFlagConfirm yes yes no 0 or 1 SetEnableHostFlagTerm yes yes no 0 or 1 SetEnableHostFlagWakeup yes yes no 0 or 1 35 In Host service the PwrOff command automatically transmits PwrOff to the IM line if the IM line is captured 36 support for 38400 baud was removed in firmware version 1 05 Section 12 IMM Commands Command Allowed Allowed Allowed Conm nts from Host from IM as Group SetEnableHostPromptConfirm yes yes yes 0 or 1 SetEnable
18. TModem3 in Config Type 1 are seconds with a maximum value of 600 seconds If the GetCD response shows TModem3 gt 600 the actual delay in Config Type 1 is 600 seconds 5 5 3 TModem4 TModem4 applies only to Config Type 1 bii binary commands a special case for use exclusively with older SBE 44 and UIM devices TModem4 is the maximum inter character delay time before the IMM terminates reception of a reply to a bii command This is analogous to the BINARYGAP setting on the SIM Valid values for TModem4 are 0 to 3000 units are tens of milliseconds TModem4 3000 means 30 seconds The TModem4 setting exists in IMM firmware V1 02 and later Note that inter character delays cannot terminate IM reception in most communication because the system may receive noise characters if the IMM is receiving while nothing is transmitting to the line 5 6 Exiting Host Service Mode The host should exit Host Service mode with the PwrOff command The PwrOff command returns the IMM to Sleep mode If the host removes the IMM s power supply it should first send the PwrOff command and then wait 100 milliseconds before cutting power 19 Tf no IM carrier is detected the IMM does not wait for THost2 but terminates immediately with a NO REPLY Error Section 6 Sending Commands to Remote Devices 6 Sending Commands to Remote Devices Commands can be sent to remote devices only when the IMM is in Host Service mode The Inductive Mooring line allows half duplex
19. Warning Tag Reporting Unexpected Action by the IMM This second function of Warning tags is used by the SampleAdd command The SampleAdd command may return a warning tag if an old sample was automatically erased to make room for the new sample This is not an error condition since the new sample was created but the host may need to identify this condition so a Warning is generated An example 1s provided in the detailed command description for the SampleAdd command 4 5 lt Executing gt Tag The Executing tag indicates the IMM is processing the command but additional time is required to complete the command The Executing tag may be sent any number of times in response to a single command In general the IMM sends an Executing tag at least once per second if an operation takes more than 1 second to complete The IMM does not interrupt open reply tags e g lt RemoteReply gt or lt SampleData gt to send Executing tags The IMM does not send an Executing tag in response to commands received from the IM line 4 6 Comment Tags Comment tags are presented in the standard XML format as in lt this is a comment gt Comments carry data intended to help users become familiar with the operation of the IMM and keep track of the IMM state when controlling it with a terminal program Comment tags are enabled when the DebugLevel is 3 or higher Comments are specifically not intended for machine parsing To ensure maximum upgradeability any use
20. e SampleEraseMultiple erases all samples starting at the specified ID and including all lower IDs e SampleEraseAll erases all samples in memory 10 5 Overwriting Samples and Memory Overflow If the Sample Data structure does not have enough memory to complete an add or append command the data for that transaction is truncated If an add command is received when the maximum number of samples already exist in memory the oldest sample is automatically deleted The maximum number of samples may be set in Configuration Data with SetMaxNumSamples xx where xx is an integer from 1 to 40 Example The Sample Data structure starts empty A single sample is added that consumes the entire available memory space Each time an Add command arrives a new sample is created All of these new samples are empty because there is no available memory This continues until the maximum number of samples is reached After the maximum is reached the next Add command causes the original large sample to be erased This immediately frees the memory that was taken by that original large sample and the in process add command successfully records data 33 Tf the maximum is set to a number smaller than the number of samples currently in memory each SampleAdd or SampleAddN will delete only one old sample before creating a new sample leaving the number of samples in memory greater than the specified maximum until a SampleErase SampleEraseMultiple or SampleEraseAll co
21. erased gt lt WARNING gt lt ConfirmationRequired gt lt Executed gt IMM gt hostfileerase lt Executed gt HostFileGetData Retrieves the Host Data File Allowed from Host Yes IM Yes Group No Format hostfilegetdata 00hostfilegetdata Modifies Nothing Requires Nothing Effects Returns data Returns The Host Data File enclosed in a lt HostData gt tag Example IMM gt hostfilegetdata lt HostData Len 14 CRC 0x00000000 gt this is a test lt HostData gt lt Executed gt HostFileGetSummary Returns a summary of the Host Data File Allowed from Host Yes IM Yes Group No Format hostfilegetsummary 00hostfilegetsummary Modifies Nothing Requires Nothing Effects Returns data Returns A lt HostFileSummary gt tag Example IMM gt hostfilegetsummary lt HostFileSummary Len 14 CRC 0x00000000 gt lt Executed gt HostFileWrite Writes binary data to the Host Data file Allowed from Host Yes IM No Group No Format hostfilewrite Section 12 IMM Commands Modifies Nothing Requires Nothing Effects Waits up to 3 seconds from the lt Executing gt tag for the first data byte before timing out Writes data to the Hostfile until a 1 second inter character delay occurs or the Host File overflows Returns lt Executing gt when ready to receive dat
22. exist to allow the host to power up process commands and power down Configuration of these timeouts and delays may be host specific The IMM is shipped with default timeout and delay values but users should expect to configure these parameters to suit their application All timeouts and delays are part of the IMM s Configuration Data Configuration Data can be updated by the host with a PC and special cable or over the inductive modem Configuration Data may be changed in the field 27 The inter character delay timeout is not the primary safety mechanism but it offers additional security through redundancy Section 8 IMM Host Interface in IM Service Mode 8 6 1 THost0 Maximum Wait for Wake up Confirmation Some hosts require time to initialize after wake up THost0 allows an adjustable timeout period for the IMM to wait for confirmation that the host is awake before the IMM assumes the host is awake The delay does not apply to host initiated communication Valid values for THost0 are from 0 to 1000 units are tens of milliseconds THost0 100 means 1 second If THost0 is set to a non zero value failure of the host to confirm wakeup before the timeout causes the IMM to log a THost0 event in the Event Counters If the host interface uses the HostPrompt for wake up confirmation and the IMM receives the wrong prompt from the host the IMM logs the event as if it were a THost0 timeout 8 6 2 THostl Delay after Confirm THostl provide
23. in Section 2 IMM Conceptual Model Section 2 IMM Conceptual Model 2 IMM Conceptual Model The IMM Model is divided into three logical sections Hardware Nonvolatile and Volatile The hardware section refers to physical devices and circuits The Nonvolatile section contains structures stored in EEPROM that persist when the IMM loses power The Volatile section consists of structures stored in RAM that are cleared or reset when the IMM loses power 2 1 Hardware 2 1 1 Host Every IMM has a single logical host The host may be an instrument a buoy controller a node of a larger network or some unknown hardware capable of serial communications In Sea Bird products like the SBE 39 IM or SBE 37 IM the host instrument is the SBE 39 or SBE 37 2 1 2 DPSK Transceiver with Tone Detect The DPSK Transceiver is the electronic system that transmits and receives data with Differential Phase Shift Keying DPSK on the inductive mooring line The transceiver is usually off it turns on in response to a host command or an event from the Signal Detector 2 1 3 Signal Detector The Signal Detector is a low power electronic system that detects the presence of a wake up tone or DPSK transmission on the inductive mooring line When the detector identifies a signal it enables the DPSK Transceiver to receive and decode the signal The Signal Detector can be disabled to save a small amount of power if it is not required 2 1 4 Inductive Cable Coupler
24. in the IMM when the input voltage rises above 19V The pass element in this regulator should not dissipate more than 150mW At 35mA the pass element is safe to 24V For optimum protection the series resistor must reduce the input voltage below 24V at an input current of 30 mA These numbers are for standard axial leaded resistors wrapped in heatshrink assuming operation in the worst case failure mode for 2 minutes Continuous operation in the worst case failure mode requires double the series resistor wattage ratings listed Section 13 Electrical Specification 13 5 Power Consumption Estimates Power consumption is highly dependent on setup When connected to a PC with RS 232 the PC s RS 232 load resistors consume more power than the entire IMM When connected to a low load RS 232 receiver or with logic level serial the device is much more efficient Table 13 6 Power Consumption Measurements Firmware Version 0 98 Mode Vin 10V Asleep Signal Detector Enabled 25uA IM Receive 0 65mA Host Service RS232 no load 0 9 mA Host Service RS232 w PC standard load 2 15mA Host Service Captured line transmitting RS232 no load low 1 42mA power tx 100 turn coupler IM Service during reply to command RS232 no load low 1 42mA power tx 100 turn coupler Pessimistic Estimates for an IMM with logic level serial 12V battery input e Total for 1 year listening to IM line with no activity
25. level serial devices have a different part number from the RS 485 version RS 485 devices may have longer lead times Like the existing Surface Inductive Modem SIM gt Like the existing SBE 44 Underwater Inductive Modem UIM Section 1 IMM Overview and Conceptual Model Figure 1 1 Diagram of IMM Conceptual Model Inductive Modem i Module IMM i Host Serial Port Connects to Instrument Buoy Controller Network Node or other device Hardware Data Serial Number HostFlag Digital Input Manufacturer Manufacture Date Hardware Version i IMFlag Digital Output Firmware Version Firmware Date DPSK Transceiver Tone detect On Off Status Data Transmit Receive Power Level Event Summary Host Data Summary Sample Data Summary Signal Detector E Enable Disable Configuration Data Config Type Inductive Cable Coupler Device ID Host ID 64 characters Hardware Config Type 1 SIM Emulation Config Type 2 Standard IM Command Buffer 127 bytes maximum Sample Data 40 samples 16Kbytes maximum Sample Number Length CRC Checksum Samples must be erased in order of creation Host Command Buffer 127 bytes maximum Operating Mode Nonvolatile IM Reply Buffer E EEPROM 8K running FIFO E Volatile RAM Host Data File 4Kbytes Length CRC Checksum GData Reply Buffer 127 bytes maximum Each item in the IMM conceptual model diagram is described
26. s gt ForceCaptureLine Reserves IM line by transmitting a carrier signal without first checking that no other or FCL device is using the IM line Allowed from Host Yes IM No Group No Format forcecaptureline Modifies DPSK Transceiver State Requires Nothing Effects Starts transmitting a carrier on the IM line without first determining if another device is already transmitting Returns FAILED Error and POWER FAIL Error if the transmit voltage is too low This condition can be caused by a bad cable coupler Example forcecaptureline lt Executed gt GData Global command causes all IMMs to send value of GDataStr to their hosts legacy Use group commands when possible in new designs G0 GDATA instead of GDATA Allowed from Host No IM Yes Group Yes Format gdata G1 gdata Modifies Nothing Requires Nothing Effects Returns data Returns Global or group command no return allowed GetCD Get Configuration Data Allowed from Host Yes IM Yes Group No Format getcd 00getcd Modifies Nothing Requires Nothing Effects Returns data Returns All parameters in Configuration Data in the format lt ConfigurationData DeviceType SBE90554 IMM SerialNumber 70000047 gt lt Settings ConfigType 2 DebugLevel 2 BaudRate 9600 HostID Host ID not set GdataStr GDATA HostPrompt x ModemPrompt imm gt DeviceID 1 EnableHostFlagWakeup 0 EnableHostFlagConfirm 0 Section 12 IMM Commands 5
27. specific interface e g disabling IM receiver via IM interface FAILED e Report of negative result e g EEPROM test failed CaptureLine command failed cable coupler test failed ABORTED e User aborted active process e g escape key in IM transmit or discovery IM RECEIVE e Inductive Modem received invalid characters OVERFLOW e Buffer or data structure overflowed and data was truncated TIMEOUT e Timing parameter violated POWER FAIL e Low battery or low power condition FACTORY SETUP e A factory setting was not entered customers should never see this error 4 3 lt ConfimationRequired gt Tag The IMM sends the ConfirmationRequired tag in response to commands that must be repeated before they take effect This is common when changing critical elements in Configuration Data such as the serial type or baud rate The ConfirmationRequired tag is often but not always accompanied by a Warning tag Example IMM gt setbaudrate 19200 lt WARNING gt IMM will power down next power up after confirm will use new baud rate lt WARNING gt lt ConfirmationRequired gt lt Executed gt IMM gt setbaudrate 19200 lt Executed gt In the example the first time SetBaudRate is sent the ConfirmationRequired tag indicates the command did not take effect When SetBaudRate is sent a second time the ConfirmationRequired tag is not sent again indicating the parameter is set 4 4 lt Warning gt Tags Warning tags have two signifi
28. than 2 characters now generate errors Empty command now generates executed and clears host service mode timer PEN AD Version 1 05 1 Added checksums and backup storage of Configuration Data and Hardware data to prevent loss of device configuration if power removed during EEPROM write 2 Corrected error in SampleAdd and Sample Append commands that caused early termination of data 3 Corrected timing error in Host Service mode when IM not transmitting Error resulted in longer fixed delays and longer timeout periods Removed support for 38400 baud Added NOTIMEOUT command for lab calibration procedures Added IMMonitor command to log all IM traffic including noise if no device is transmitting Added ability to upgrade firmware through RS232 port Added shortcuts for common commands FCL ForceCaptureLine TCC TestCableCoupler T20CC Test20TurnCoupler REL ReleaseLine SWT SendWakeupTone AAA Version 1 04 1 Added filter to transmit voltage measurement 2 Corrected invalid DPSK transmit state after TestCableCoupler command The invalid state persisted in Host service mode only until the transmitter was disabled a or command was transmitted or the line was released The invalid state usually resulted in inappropriate error FAILED Low Transmit Voltage low battery or bad coupler Section 14 Firmware Revision History Version 1 03 EN PERDE 8 9 10 Config Type 1 host serial decoding matched to SIM 11 Time co
29. to GND inactive 10 megaohms 13 3 Absolute Maximum Ratings Table 13 5 Minimum and Maximum Voltages Parameter Minimum Maximum Power Supply Input Voltage 30V 30 HostFlag Input Voltage to GND 10V 30V IMFlag pulldown current 30mA IMFlag Output Voltage to GND inactive 0 5V 12V Serial Inputs 12V 12V Logic Level Serial input 12V 5V 13 4 Power Supply Input e Standard Operation The IMM power supply is optimized for direct connection to batteries from 9VDC to 24 VDC with potential voltage spikes to 30VDC e High Input Voltage Operation A High voltage input adapter board is available for applications with input voltages between 20 VDC and 80 VDC This board holds both an IMM and a high efficiency power converter Continuous operation of the IMM at high input voltages without the adapter board is possible at significantly reduced efficiency with the addition of an external series resistor on the power supply input The series resistor protects the IMM power system from a worst case operating current of approximately 33mA The series resistor value and wattage rating depend on the maximum input voltage Rseries min 31 Vin max 22 ohms for example 42V in gt 620 ohms Vin lt 27V gt 0 125 Watt resistor rating Vin lt 35V gt 0 25 Watt Vin lt 42V gt 0 5 Watt Vin gt 42V not recommended because the efficiency falls below 40 4 A linear regulator activates
30. two characters instead of one 6 Corrected inappropriate logging of Error37 in Config Type 1 7 Config Type 1 blocked commands now return NOT ALLOWED error 8 Config Type 1 resets timeout timer on CR or LF instead of just LF Version 1 01 1 Serial Type not preserved when switching from Configuration Type 1 to Type 2 2 Start of reply marker detection disabled for Configuration Type 1 B commands for binary response This legacy command was used with the UIM the UIM does not send the start of reply code with the B command Section 15 Specification Revision History 15 Specification Revision History Version 1 05 2007 03 28 This document supersedes all IMM preliminary specifications It describes IMM Firmware Version 1 05 All future changes to the specification will be listed here Version 1 09 2008 09 12 Updated firmware revision history Section 16 Index 16 Index A Adding samples 31 Appending samples 31 B Backspace 19 Binary data 30 C Capturing line 21 Commands 36 detailed descriptions 40 group 37 sending 36 Set 53 summary tables 37 Comment tag 16 Conceptual model 6 8 Configuration Data 9 Confirmation required tag 15 Connectors 58 D Data 21 Data reply tag 16 DPSK Transceiver 8 E Echoing 19 Electrical specification 58 Erasing samples 32 Error tag 14 Event Counters 9 Executed tag 14 Executing tag 16 F Fi
31. 47 gt lt Event type PowerOnReset Count 1 gt lt Event type IMUartLockup Count 186 gt lt EventList gt lt Executed gt GetHD Get Hardware Data Section 12 IMM Commands Allowed from Host Yes IM Yes Group No Format gethd 00gethd Modifies Nothing Requires Nothing Effects Returns data Returns IMM gt gethd lt HardwareData DeviceType SBE90554 IMM SerialNumber 70000047 gt lt Manufacturer gt Sea Bird Electronics Inc lt Manufacturer gt lt HardwareVersion gt 41420B lt HardwareVersion gt lt HardwareVersion gt PCB Type 2 10345A lt HardwareVersion gt lt MfgDate gt May 4 2006 lt MfgDate gt lt FirmwareVersion gt IMM Ver 1 02 lt FirmwareVersion gt lt FirmwareDate gt May 4 2006 lt FirmwareDate gt lt HardwareData gt lt Executed gt Definition of the lines e SerialNumber Each IMM and IM enabled instrument has a unique serial number greater than 100 and less than 2 Serial numbers are set by Sea Bird and cannot be changed In Sea Bird IM enabled instruments the serial number of the inductive modem is the serial number of the instrument e Manufacturer Always reads Sea Bird Electronics Inc e HardwareVersion A string identifying the assembly number of the IMM or of the PCB which holds the IM circuit in a Sea Bird IM enabled instrument
32. BinaryData is allowed from the host the IM and as a group command Default is 1 for all Interface modes SetEnableEcho x x 1 IMM echoes all characters received from the host back to the host x 0 Disable the echo SetEnableEcho is allowed from the host the IM and as a group command Default is O for Interface modes 1 through 6 and 8 through 13 default is 1 for Interface modes 7 and 14 SetEnableFullPwrTX x x 1 IMM transmits with the lesser of 9V or the input voltage The higher power transmit option increases signal strength by as much as a factor of 3 and increases power consumption during transmission to 50mW at 10V with 100 turn coupler x 0 Use low power transmit mode with transmitting power consumption of 10mW at10V SetEnableFullPwrTX is allowed from the host the IM and as a group command Default is O for all Interface modes SetEnableGDataToSample x x 1 IMM stores host response to GData command as a sample in Sample Data instead of storing the response in the GData Reply Buffer This removes the 127 byte limitation on the host reply x 0 IMM Stores host response to GData command in the 127 byte GData Reply Buffer SetEnableGDataToSample is allowed from the host the IM and as a group command Default is O for all Interface modes SetEnableHostFlagConfirm x x 1 IMM interprets a low high transition on the HostFlag signal to confirm wake up of the host x 0 Disable this confirmation SetEnableHostF
33. Handshake signal 1 5V to 12V input with internal 4 7K series resistor 4 Hostrlas In 100K pulldown resistor 10nF load and 12Volt TVS Hardware Handshake signal Pulldown only 100ohm series resistor and 330pF load MEE Out Static protected with IDV TVS i 1 5 Rx RS 485 receive signal 6 Rx RS 485 receive signal 7 Tx RS 485 transmit signal 8 Tx RS 485 transmit signal 9 Vin Power supply 6 0 30VDC 10 GND Power Supply Return Ground Table 13 3 J2 Pinout same for RS 232 and RS 485 versions Pin Signal Description 1 IM Coil Positive side of IM coil connect to center if using coax 2 IM Coil Negative side of IM coil connect to shield if using coax 3 GND Power supply return IM coil shield if using twinax cable 4 Vin Power supply 6 0 30VDC Section 13 Electrical Specification 13 2 Hardware I O Line Characteristics The HostFlag input is triggered on the low high transition with one exception When EnableHostFlagWakeup 1 the IMM tests the state of the HostFlag line just prior to entering Sleep mode If HostFlag is high the IMM immediately switches to Host Service instead of going to sleep If EnableHostFlagWakeup 1 the HostFlag input must be low or floating for the IM to go to sleep Table 13 4 Electrical Characteristics Parameter Minimum Typical Maximum HostFlag Input logic low NA 2 0V HostFlag Input Pulse width 200uS IMFlag Resistance to GND active 100 ohms IMFlag Resistance
34. Host5 IMFlag Hold after Reply Termination sesse esse esse ee se ee se ee ee ee ede ee ee ee ee ee ee ee Ge Ge Ge GR ee 30 9 HANDLING OF BINARY DATA ys esse see ree ssesbaesese sesde geskie ede sed egesee bie see dees ee ges Eg ede sk seg dbe sees Ee Rek Sue Gee Dee 31 10 USING SAMPLE DATA ati A RA tc ad 32 10 1 ADDING AND APPENDING SAMPLES sssssccssssssccesssstecssssssccssssseccssssseccsssuneccsessseecssusnescesssneccsessneccsesneees 32 10 2 RETRIEVING LIST OF SAMPLES use sae be cows uate vee Ed SR see ENG OER cogs sete ese Eg KG ee Egan ER ee ude vee Ee Se see ER ie Ds 32 10 3 READING SAMPLES sis ee Ee ee ee illo dali tale 33 10 4 ERASING SAMPLES isi SS EE Es Ge ee EE en a Ee DS Ee ee ee a 33 10 5 OVERWRITING SAMPLES AND MEMORY OVERFLOW eise ees esse ees ee se ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee 33 11 IMM COMMANDS iese eis beese eds gees sedr sesse esse dese bede cli Gede pi Ed non bee hoeke de en ed ere edge 34 1 1 COMMAND ADDRESSING ririo vets ES ER TEA a SEL Goue ca sanectecedsahbaden vee ea ee ee geed Dee DEER a 34 11 2 SENDING COMMANDS ssi ER sec Gee Ge Se se A a ted ee ee e Gee se Re ee ee LEAL ia RE se Ge de Ge GE Ee 34 11 2 1 Interrupting Replies to IM Commands 0 00 esse ese ee ee ee ee Ge GR GRA RA AR Re ee ee ee ee ee Ge 35 TE GROUP COMMANDS EE EG Ge Ged ee ee tte MR Nata ee es ge Le BU aa 36 11 4 COMMAND SUMMARY TABLES preni esse ee ee esse ee ee ee se ee ee ee ee e
35. HostServeOnPwrUp yes yes yes 0 or 1 SetEnablePrompt yes yes yes 0 or 1 SetEnableHostWakeupCR yes yes yes 0 or 1 SetEnableHostWakeupBreak yes yes yes 0 or 1 SetEnableSerialIMM Wakeup yes yes no ee EG and ems SetEnableSignalDetector yes no no es on es SetEnableStripHostEcho yes yes yes 0 or 1 SetEnableToneDetect yes yes yes 0 or 1 SetGDataStr yes yes yes 1 32 character string SetGroupNumber yes yes yes 0 9 SetHostID yes yes yes 4 64 character string SetHostPrompt yes yes yes 1 7 character string SetID yes yes no 0 99 same as SetDeviceID SetIMFlag yes yes yes 0 or 1 1 14 Confirmation required and returns Warning tag SENET ace Mode yes Be no Note For Versions lt 1 0 this command was SetConfigMode SetMaxNumSamples yes yes yes 1 40 SetModemPrompt yes yes yes 1 7 character string SetSerialBreakLen yes yes yes 1 255 SetSerialType va yes o 0 2 Confirmation required and returns Warning tag SetTermFromHost yes yes yes 0 255 SetTermToHost yes yes yes 0 255 SetTHost0 yes yes yes 0 1000 SetTHostl yes yes yes 0 300 SetTHost2 yes yes yes 0 or 100 3000 SetTHost3 yes yes yes 100 18000 SetTHost4 yes yes yes 0 1000 SetTHost5 yes yes yes 5 3000 SetTModem2 yes yes yes 5 3000 SetTModem3 yes yes yes 100 18000 SetTModem4 yes yes yes 0 3000 StayOn yes yes yes Global IM command Test20TurnCoupler T Ge yes no TestCableCoupler oe ie yes no TestEEPROM yes yes no TXTest no yes no 11 5 Deta
36. IMM and IM enabled instrument has a unique serial number greater than 100 and less than 2 Serial numbers are set by Sea Bird and cannot be changed In Sea Bird IM enabled instruments the serial number of the inductive modem is the serial number of the instrument 2 2 2 Configuration Data Configuration data includes all settable parameters related to operation of the IMM including all host communication settings A standard command GetCD allows you to review Configuration Data Configuration data does not include the IMM serial number because the serial number cannot be changed but the reply to GetCD includes the serial number for convenience Configuration data may be changed in the field and may be updated by the host by a PC with a special cable or over the inductive modem Some commands that edit configuration data must be confirmed by repeating the command before settings are changed The Configuration Type Config Type defines the set of available commands in the IMM Configuration Types provide for backwards compatibility as well as future expansion Config Type 1 emulates the now obsolete SIM coupled and SIM direct modems Config Type 2 is the standard IMM Additional Configuration Types may be defined later for custom applications The Device ID is a two digit number from 00 to 99 used to address the IMM This number is user programmable The Host ID is a user programmable 64 character string provided to help describe and iden
37. IMM sends the command to the host after the THost1 delay without waiting for confirmation 8 2 1 Confirming Host Wake up with HostPrompt If EnableHostPromptConfirm 1 the host may confirm wake up by sending a string matching the HostPrompt setting HostPrompt is a string of 2 to 8 characters Host prompt confirmation operates independently of other host wake up options except for the special case of THost0 0 which causes the IMM to ignore the host prompt settings Use SetEnableHostPromptConfirm to enable disable the host prompt confirm feature Use SetHostPrompt to set the host prompt If EnableHostPromptConfirm 1 and the IMM receives the wrong prompt from the host the IMM logs the event as if it were a THost0 timeout 8 2 2 Confirming Host Wake up with HostFlag Input If EnableHostFlagConfirm 1 the host may confirm wake up with a low high transition of the HostFlag input HostFlag confirmation operates independently of other host wake up options except for the special case of THost0 0 which causes the IMM to ignore the HostFlag confirmation setting Use SetEnableHostFlagConfirm to enable disable the HostFlag confirm feature 8 3 Sending Command to Host The IMM allows an adjustable delay between receiving confirmation of wake up from the host and transmission of the command to the host This delay is set by THost1 described below The THost1 delay always applies even in the special case where host wake up confirmation is disabled b
38. Inductive Modem Module IMM User s Manual Sea Bird Electronics Inc 1808 136 Place NE Bellevue Washington 98005 USA Telephone 425 643 9866 Fax 425 643 9954 E mail seabird seabird com Manual Version 1 07 2008 01 22 Website www seabird com Firmware Version 1 07 and later Limited Liability Statement Extreme care should be exercised when using or servicing this equipment It should be used or serviced only by personnel with knowledge of and training in the use and maintenance of oceanographic electronic equipment SEA BIRD ELECTRONICS INC disclaims all product liability risks arising from the use or servicing of this system SEA BIRD ELECTRONICS INC has no way of controlling the use of this equipment or of choosing the personnel to operate it and therefore cannot take steps to comply with laws pertaining to product liability including laws which impose a duty to warn the user of any dangers involved in operating this equipment Therefore acceptance of this system by the customer shall be conclusively deemed to include a covenant by the customer to defend indemnify and hold SEA BIRD ELECTRONICS INC harmless from all product liability claims arising from the use or servicing of this system Table of Contents Table of Contents INDUCTIVE MODEM MODULE MM sees ses ese sees sees se sees sege se sesse se see ese esse sees se sege sege see egg ee ge ge egg eg ee Eg ee 1 LIMITED LIABILITY STATEMENT esse
39. Line only IM No Group No Format sendwakeuptone Requires IM line must be captured Modifies IM line Effects Sends a 4 second wake up tone to the IM line Returns NOT ALLOWED Error if the IM line is not captured Returns lt Executing gt about once per second followed by lt Executed gt when finished Example IMM gt sendwakeuptone lt Executing gt lt Executing gt lt Executing gt lt Executed gt Set commands See Configuration Type 2 Set Commands below StayOn Resets the IMM s 2 minute sleep timer Allowed from Host Yes IM Yes Group Yes Format stayon 00stayon IG1 stayon Reguires Nothing Modifies 2 minute sleep timer Section 12 IMM Commands Effects Resets the IMM s 2 minute sleep timer keeping the device awake Test20TurnCoupler Tests the integrity of the IM cable coupler For 20 turn couplers only or T20CC Allowed from Host Yes Captured Line only IM Yes Group No Format test20turncoupler 100test20turncoupler Requires IM line must be captured 1f command sent from host Requires This command requires a 20 turn coupler or test results will be misleading Modifies IM line Effects Performs a test of the IM cable coupler NOTE When the test20turncoupler command is received from the IM line several characters of nois
40. MM terminates the command No inter character delay is required in the host reply The THost2 setting allows an adjustable timeout for the start of the host reply If the host does not send at least one character excluding echoed characters in reply to the command within THost2 an error will be generated and communication cut off There is an exception when THost2 is 0 the IMM does not allow the host to reply at all the IMM ignores the host response and behaves as if the host terminated its reply immediately The IMM starts transmitting the host reply to the IM line immediately If bytes arrive from the host faster then they can be transmitted they are stored in the Host Reply buffer This is an 8 KByte FIFO buffer No buffer overflow indication is provided for the host but if the buffer overflows an error is generated and an event is logged in the Event Counters The IMM provides an inter character delay timeout THost4 and a maximum reply time timeout THost3 THost3 sets a hard limit on the maximum duration of a host reply at 180 seconds This allows up to 20 Kbytes of data Sea Bird recommends limiting replies to 8 KBytes to avoid problems with the Host Reply buffer and the maximum reply time 8 5 1 Host Echo If the host echoes characters of the command sent by the IMM back to the IMM the echoed command becomes part of the host reply If EnableStripHostEcho 1 the IMM automatically deletes the host s echo of the command and any terminati
41. N ER EE ENE 11 2297 GData Reply Bulletins OO OR this hs tati 11 2 2 8 IM Reply Buller ss Socata Ve eg Se he acute ai ea ee en ee ee een 12 273 VOLATILE STRUCTURES ee ee AAA tides A cds cused Age tata acted da ee ge ee ed needs 12 2 36 Operating Mde sirere eteren EE ER KO RR AR RE da 12 2 32 Host COMMAND a e ad td ee 12 2 3 3 MC aos 12 3 OPERATING MODES sistiese eis steke Ges er beves de speen eek ee kes ve ek see geseg eek Do ee ve bees e Re ee Ee ee dee 13 Bel HOST SERVICE SE Ge SEG ee Ge rete aes chess WE ee es dole Ee ee Gee ee WESE A Se Ee ee Ee ne de We og N ee ese ee See es ke 13 3 2 IM SERVICE EE EE RE ER EE AR RE EE EE EE EN 13 37 AM RECEIVE Mi RE EER reste Ee ek ee ee ee Ee ee oe ee A Gee AE ee a ee ee enced 13 3 4 OASE RE EE ER OE TE N TE OR EN EE ee 13 355 IPOWEREYCEING IMM td dao 14 4 REPLY TAGS AND XML LIKE FORMATTING seese sesse eseseese se ese see se se ege see se ee oge see se see gee ge Se See e ee Se gee ge Se gee ge Se eg ee 15 All EEXEGUTED S VAG Ts RA Ee ee N ee ee N A ee ee ee Oe ee AAS Ea ee ETAST 15 4 2 ERROR TAGS 040 eel EE ee ee E ee Ee AA A AA ee Ee ee ee RR Bab Ee 15 A3 lt lt CONFIMATIONREQUIRED gt DAG tees esse gese eke eed be be ee ree Se se Geestes bede ee Nee Nee Segoed oseane ese ge 16 44 lt lt WARNINGS TAGS SES EE SS WE a deseo RE ED DE EE EE ee Se 16 4 4 1 Warning Tag Reporting Potentially Serious Consequences iese sees see ss ee Sk ee ee ee ee ee ee ee 17 4 42 Warning Tag
42. Oresetec IG1 resetec Modifies Event Counters Reguires Nothing Effects Resets all event counters to zero Returns lt Executed gt ResetEventCounters Same as ResetEC See ResetEC above SampleAdd Creates a new sample in Sample Data and adds binary data to it Allowed from Host Yes IM No Group No Format sampleadd Modifies Sample Data Requires Nothing Effects Creates a new sample then sends lt Executing gt tag to host Adds binary data from the host to the new sample until a 1 second inter character delay occurs or sample memory overflows Returns lt Executing gt when ready to receive data Returns TIMEOUT Error if no bytes arrive within 3 seconds of the Executing tag Returns OVERFLOW Error if more bytes arrive than can be stored in Sample Data Returns WARNING tag if the Sample data structure contained MaxNumSamples before executing this command The warning indicates that the oldest Sample in memory was deleted to make room for the new one User software should avoid dependencies on the contents of Warning tags Example IMM gt sampleadd lt Executing gt this is a test lt Executed gt 38 MaxNumSamples is part of Configuration Data settable to any value from 1 to 40 Section 12 IMM Commands SampleAddLine Creates
43. PwrOff tells the remote devices to return to Sleep mode releases the line and then tells the IMM to return to Sleep mode SendPwrOff just tells the remote devices to return to Sleep mode These are different commands 20 The probability that two devices will collide while capturing the line i e both devices believe they have the line given that they receive the CaptureLine command at the same time is approximately 1 in 1000 Section 7 Receiving Commands from Remote Devices 7 Receiving Commands from Remote Devices The IMM receives data only if the Signal Detector is enabled When another IM device captures the IM line the IMM automatically enters IM Receive mode unless the Signal Detector is disabled or the IMM is already in Host Service mode If properly addressed data arrives when the IMM is in Host Service mode the IMM responds with a lt Busy gt signal When a properly addressed command arrives from the IM line and the IMM is in IM Receive mode the IMM enters IM Service mode and executes the command If the command requires interaction with the IMM s host as in commands and certain global commands the IMM enters IM Service mode and initiates communication with its host 7 1 Waking IMM from IM line The IMM has an internal Signal Detector with multiple internal wake up states in which it detects incoming signals and differentiates between incoming IM transmissions and electrical noise caused by radar lightening strikes
44. Reporting Unexpected Action by the IMM oe see se se ee Sk Re ee ee ee ee ee Ge 17 AS EXEGUTING S TAGS ER es gee AR ee GE ee ve ed ee Re De Abed EA A AE AA ee ge tata ab 17 AG COMMENT TAGS srrsirppi ER EE EE RE OR OE OE N N 17 Table of Contents 4 7 lt HOSTSERVICE2MINTIMEOUT gt REPLY TAG rie irran AE AATA A EAA AAE AA 17 4 8 DATA REPLY TAGS sesse Ee EA E Deeg dee See E A eE EE EEE EAE 18 5 IMM HOST INTERFACE IN HOST SERVICE MODE seseseeseesesesecececeeceeoececeeceeeececoceeeeecececeeceesececoseeeeeosceseeeeesee 19 5 1 ENTERING HOST SERVICE MODE EE SE Ge NG Ee Ge Ge aiii 19 5 1 1 Entering Host Service Mode with Power Cycling esse esse esse esse ee se ee se ee eed ee Ge ee ee ee ee ee ee ee ee se 19 5 1 2 Entering Host Service Mode with Serial Line Transition esse esse ee se se ese ee Ge Ge Se ee ee ee ee ee se 20 5 1 3 Entering Host Service Mode with HostFlag Transition esse esse ee se ee se ee ee ee ede see ee ee ee ee ee ee ee ee se 20 5 2 SENDING COMMANDS FROM HOST TOIMM esse esse ee ee ee se ee ee ee se ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee Ge ee ee ee ee ee 20 5 2 1 Terminating Commands to IMM eee se se se se ee ee ee ee i Ge GRA GRA GR ee ee a ee ee ee se 20 5 3 IMM PROMPTS AND ECHOING ruri SS iets Ge A OE ENG aed a het de leek ee ge ee 20 IAS ve dy ORR N EG OE ON EE EE des 20 5 5 TIMEOUT PARAMETERS IN HOST SERVICE MODE ripi ireen ee ee ee se ee ee ee ee ee ee ee se ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee
45. a Returns NOT ALLOWED Error if the Hostfile is not empty The Hostfile must be erased prior to writing data Returns TIMEOUT Error if no bytes arrive within 3 seconds of the Executing tag Returns OVERFLOW Error if more than 4096 bytes arrive Example IMM gt hostfilewrite lt Executing gt this is a test lt Executed gt Example IMM gt hostfilewrite lt Error type NOT ALLOWED msg Erase Hostfile before writing gt lt Executed gt ID Returns Device ID legacy Use GetCD or Disc in new designs Allowed from Host Yes Captured Line only IM Yes Group No Format 1d 1d This is a global command that returns data It must not be used if more than one instrument is coupled to the IM line This command does not use reply tags Modifies Nothing Requires There must be exactly one receiving IM device on the mooring Effects Returns data Returns The Device ID of the IM device on the line Example IMM gt id lt RemoteReply gt id 00 lt RemoteReply gt lt Executed gt MeasureLineSignal Measures the incoming DPSK signal on the IM line or MLS Allowed from Host Yes IM No Group No Format measurelinesignal Modifies DPSK Transceiver state Requires Nothing Effects Echoes the string back to the IM line Returns lt LineSignal S 48 gt lt Executed gt Note Typical value is 41 43 when device is transmitting to IM line 47 49 when a wake up tone is present Value lt 38 or gt 50 indicates no signal noise or weak si
46. a new sample in Sample Data and adds data to it Allowed from Host Yes IM Yes Group Yes Format sampleaddline data 00sampleaddline data G1 sampleaddline data Argument Data to write to the new sample not binary CRLF termination is no added to the sample Modifies Sample Data Requires Nothing Effects Creates a new sample and adds data following the colon to it The amount of data stored with this command is limited by the length of the Command Buffer Returns OVERFLOW Error if more bytes arrive than can be stored in Sample Data Returns WARNING tag if the Sample data structure contained MaxNumSamples before executing this command The warning indicates that the oldest Sample in memory was deleted to make room for the new one User software should avoid dependencies on the contents of Warning tags Example IMM gt sampleaddline this is a test lt Executed gt SampleAppend Appends binary data to current sample in Sample Data Allowed from Host Yes IM No Group No Format sampleappend Modifies Sample Data Reguires Nothing Effects Creates a new Sample if there are none Sends lt Executing gt tag to host Appends binary data from the host to the current Sample until a 1 second inter character delay occurs or sample memory overflows Returns lt Executing gt when ready to accept data Returns TIMEOUT Error if no bytes arrive within 3 seconds of the Executing tag Returns OVERFLOW Error if more bytes arrive than can b
47. aming serial data The IMM allows an adjustable e inter character delay timeout with the THost4 parameter This timeout forces the end of the host reply The THost4 timer activates after arrival of two characters In instruments using hardware handshaking termination characters or break condition interfacing the inter character delay timeout acts as a safety mechanism cutting off the host in case of malfunction or error If a host instrument cannot use handshaking termination characters or break conditions THost4 may act as the primary reply termination mechanism Inter character delays are typically much shorter than maximum transmission lengths so their use may save considerable line transmission time and power over a maximum reply time THost3 timeout 8 5 6 Host Return to Sleep The host may go to sleep immediately after terminating its reply to the command If the host requires a time delay between terminating its reply and release of the IMFlag output or arrival of the next command the THost5 setting provides an adjustable delay 8 6 Timeout Parameters in IM Service Mode Inductive moorings support only one transmitting device at a time A single device transmitting continuously might disable an entire mooring Included in the safety features of the IMM are a variety of timeouts required to protect the mooring from damaged or malfunctioning host instruments In addition to the required timeouts several optional timeouts and delays
48. anced features to improve reliability and efficiency of system programming setup and maintenance 1 1 Scope and Intent of IMM Conceptual Model This section contains a high level view of the IMM conceptual model and should be read by any developer using the IMM The purpose of a conceptual model is to provide a view of the basic properties and structures of concepts In an instrument the conceptual model serves as a reference with which to describe what aspects of the instrument are affected by each possible operation whether a user command accepted by a device or a firmware function executing in the device Careful command and function descriptions using sound conceptual models help reduce unintended consequences both by end users of instruments and by programmers This can dramatically improve the ease of use and overall reliability of systems The IMM conceptual model must make sense in the context of models of individual instruments of all types from all manufacturers as well as buoy systems and future network nodes High level users must design systems that communicate with and control a wide variety of devices This task becomes more manageable if a high level conceptual model may be applied to these devices An individual manufacturer cannot specify the system level conceptual model In fact the IMM will be used by multiple systems with fundamentally different models To accommodate system designers the IMM model must be stable and suffici
49. c Level Serial Serial Handshaking with Simple Buoy Controller M a RA es eal 5 Aa ols 1000 12000 5 500 18000 1 1 V E ES 18000 RS232 Hardware Handshaking with Simple Buoy Controller sa RS232 Serial Handshaking with Simple Buoy Controller RS232 Hardware Handshaking for Symmetric Communication RS232 Serial Handshaking for Symmetric Communication RS232 Terminal Program Symmetric enue FEE EE FI Vv V V Vv vV V z 18000 1 18000 1 18000 1 O o 3 3 E 3 o 2 o 5 Logic Level Serial Hardware Handshaking with Simple Host Instrument S gt Ed V z Vv Logic Level Serial Hardware Handshaking for Symmetric Communication S gt M gt J1 j1 1 ji E ET BEEF 120005 500 18000 1 Logic Level Serial Serial Handshaking for Symmetric Communication S gt IMM gt 1 RA AR 5 AA ya 1000 12000 5 500 18000 1 Logic Level Serial Terminal Program Symmetric Communication IMM gt fe 254 5 1000 500 18000 1 12000 500 Section 13 Electrical Specification 13 Electrical Specification 13 1 IMM Connector Description Connector Option 1 Male vertical for PCB to PCB connection recommended Mating connectors Through hole Hirose DF11 10DS 2DSA 01 DigiKey H2822 ND Surface mount Hirose DF11 10DS 2V 50 DigiKey H2837 ND Connector Option 2 Male Vertical for cable connec
50. cant functions The first function is to report potentially serious consequences that may result from confirming and executing a command which returns the ConfirmationRequired tag The second function is to notify the user or host program of unexpected actions by the IMM in response to a command The function of a specific Warning tag depends on the command that generated the tag Refer to the detailed command descriptions for interpretation of Warning tags for particular commands To ensure maximum upgradeability any user program that parses IMM output should be capable of processing warning tags Programs may depend on the existence of Warning tags in response to specific commands but there must be no dependency on the content of Warning tags Warning tags may expand to include a type parameter in the opening tag similar to the type parameter in Error tags Unlike Error tags Warning tags are not self closing Section 4 Reply Tags and XML like Formatting 4 4 1 Warning Tag Reporting Potentially Serious Consequences The first function of warning tags is seen primarily in Set commands Several Set commands return Warning tags when execution of the command may have serious consequences Example IMM gt setserialtype 1 lt WARNING gt IMM will power down next power up after confirm will use RS232 Serial interface lt WARNING gt lt ConfirmationRequired gt lt Executed gt IMM gt setserialtype 1 lt Executed gt 4 4 2
51. commands are accepted from the host or over the Inductive Modem and allow addition of up to 100 bytes of data with standard termination These commands are not intended for binary data They do not include the CR and LF termination characters in the recorded data e Receiving a GDATA command from the IM line when EnableGDataToSample 1 10 2 Retrieving List of Samples The SampleGetSummary and SampleGetList commands provide views of the contents of the Sample Data structure without downloading the contents of particular samples SampleGetSummary returns a SampleDataSummary tag with the number of samples in memory total length of data in memory and available memory SampleGetList returns a list identifying all samples in memory with the Sample ID length and checksum for each sample Example IMM gt samplegetsummary lt SampleDataSummary NumSamples 1 TotalLen 2529 FreeMem 13855 gt lt Executed gt IMM gt samplegetlist lt SampleList gt lt Sample ID 0x00000008 Len 79 CRC 0x00000000 gt lt Sample ID 0x00000007 Len 2529 CRC 0x00000000 gt lt SampleList gt 30 The Exclusive command is not supported by the SBE 37 16 44 and 39 IM prior to firmware Version 2 0 and IMM prior to firmware Version 0 85 31 Sample Data checksums implemented in firmware V1 05 and later The checksums will read as 0x00000000 if firmwre versions prior to 1 05 32 Sample Data is implemented in EEPROM that has a nominal endurance of 1 mil
52. communication meaning only one device may transmit at a time If two devices attempt to transmit at the same time both messages will be corrupted This limitation prevents the IMM from allowing a standard modem interface with data transmitted and received simultaneously All communication on the Inductive Mooring line takes the form of commands and replies to commands Only one command may be sent at a time Not all commands generate replies If a command requires a reply the reply begins immediately after the command is received No additional commands can be sent until the reply is completed The maximum length of a command is 127 bytes The maximum recommended size of a reply is 8 Kbytes The absolute maximum duration of a reply is three minutes which allows up to 20 Kbytes 6 1 Capturing IM Line When the IMM is in Host Service mode the host may initiate communication on the IM line Since the IM line is half duplex data flows in only one direction at a time the host should first verify that no other device is using the IM line The CaptureLine command checks for other devices transmitting on the IM line and then reserves the IM line by transmitting a carrier signal This process is called capturing the line The ForceCaptureLine command starts transmitting a carrier signal immediately without first checking that no other device is using the IM line This is appropriate for systems where only one device will attempt to capture the line
53. ding this command Confirmation is required The IMM goes to sleep after this command is accepted When it is woken up again it uses the new Interface mode The following parameters are not changed by the SetInterfaceMode command ConfigType DebugLevel BaudRate Hostld GDataStr DevicelD GroupMembership Returns ConfirmationRequired tag and Warning tag SetInterfaceMode is allowed from the host only Default Interface mode from the factory is 7 Note For Versions lt 1 0 this command was SetConfigMode Example IMM gt setinterfacemode 7 lt WARNING gt IMM will power down next power up after confirm will use new Configuration Data settings with RS232 Serial interface lt WARNING gt lt ConfirmationRequired gt lt Executed gt IMM gt setinterfacemode 7 lt Executed gt Section 12 IMM Commands SetMaxNumSamples x x Maximum number of samples allowed in Sample Data 1 40 If the maximum is set to a number smaller than the number of samples currently in memory each SampleAdd or SampleAddLine deletes only one old sample before creating a new sample leaving the number of samples in memory greater than the specified maximum SetMaxNumSamples is allowed from the host the IM and as a group command Default is 40 for all Interface modes SetModemPrompt x x Prompt sent by the IMM to the host to cause a wake up 1 7 characters SetModemPrompt is allowed from the host the IM and as a group comma
54. ds All commands listed for Config Type 2 can be used in Config Type 1 except for blocked commands listed below Blocked Commands generate a NOT ALLOWED error in firmware version 1 02 and higher Table 11 5 IMM Commands Blocked in Config Type 1 Captureline SendWakeupTone SetEnablePrompt SetGDataStr ForceCaptureLine SetDeviceID SetEnableSerialIMMWakeup SetInterfaceMode GetLineStatus SetEnableHostFlagTerm SetEnableSignalDetector Releaseline SetEnableHostPromptConfirm SetEnableHostFlagConfirm 11 4 3 Config Type 2 Commands Table 11 6 Config Type 2 Command Summary Command Allowed Allowed Allowed omiments from Host from IM as Group Outgoing IM commands or data Captured a with ii ii Sx Sx Gn or Line Only no applicable Gn prefix ID Captured Global IM command legacy Confirmation 7 Line Only ve p9 required Returns Warning tag Restores IMM to factory state Init yes no no Confirmation required Returns Warning tag CaptureLine yes no no Data no yes no Similar to GetReply legacy Disc yes no no Provisional Command may change EchoIM no yes no Use this command when transmitting from Exclusive a v s a a SIM to an IMM Use SENDEXCLUSIVE when transmitting from an IMM to other devices ForceCaptureLine yes no no GData no yes yes Global IM command GetCD yes yes no GetConfigType yes yes
55. e will be transmitted while the test is in process See the example in the TestCableCoupler Command description below This noise is an unavoidable result of the method of testing the coupler The noise does not occur when the command is received in Host Service mode Returns NOT ALLOWED Error if the IM line is not captured when command is received from the host Returns FAILED Error and POWER FAIL Error if the transmit voltage is low Returns FAILED Error if the coupler connection is poor or the coupler is not connected Returns lt CableCouplerTest status GOOD MEDIUM BAD Z UINT16 gt if the test is performed TestCableCoupler Tests the integrity of the IM cable coupler For 100 turn couplers only or TCC Allowed from Host Yes Captured Line only IM Yes Group No Format testcablecoupler 00testcablecoupler Requires IM line must be captured if command sent from host Requires This command requires a 100 turn coupler or test results will be misleading Modifies IM line Effects Performs a test of the IM cable coupler NOTE When the testcablecoupler command is received from the IM line several characters of noise will be transmitted while the test is in process See the example below This noise is an unavoidable result of the method of testing the coupler The noise does not occur when the command is received in Host Service mode Returns NOT ALLOWED Error if the IM line is not captured when command is received from the host Ret
56. e ID HEX32 Len HEX16 CRC HEX32 gt lt Power Vtx 1f gt lt LineStatus S STRING10 gt Reply Tag Value Definitions note brackets do not appear in data UINTn unsigned n bit integer Example UINT16 is 16 bit integer HEXn unsigned n bit integer in Hex format Example HEX16 is 16 bit integer in Hex nf floating point number with n digits to right of decimal place Example 1f is a number with 1 digit to the right of the decimal place such as 8 5 or 19 5 STRINGn n character string Example STRING10 is 10 character string Section 5 IMM Host Interface in Host Service Mode 5 IMM Host Interface in Host Service Mode Host Service mode allows the host to directly send configuration commands store or retrieve data or use the IMM to send information to other devices in the inductive loop Host Service mode is initiated by the host After entering Host Service mode the IMM remains ready to receive commands until the 2 minute timer expires or the host sends the PwrOff command Nearly all host IMM interaction in Host Service mode takes the form of a command string sent by the host to the IMM termination of the command and the IMM s response to the command The only exception is the lt HostService2MinuteTimeout gt flag which the IMM sends in response to a timeout condition The host may send any number of commands to the IMM in a single Host Service session provided
57. e did not respond and the data in the RemoteReply is noise Using the escape character stops the IMM from listening to the IM signal but the remote device may still be transmitting There is no way to interrupt an in process transmission from a remote device The host must not attempt to transmit to the IM line until the remote device stops transmitting If more than one device transmits to the IM line at the same time system behavior may be unpredictable Section 12 IMM Commands 11 3 Group Commands Group commands allow addressing of pre defined logical groups of instruments For example it may be useful to place all SBE 39 IMs in Group 1 all SBE 37 IMPs in Group 2 etc allowing you to set parameters in all similar instruments at the same time A maximum of nine groups may be defined numbers 1 9 Group 0 is pre defined as the group of all instruments Individual IMMs cannot belong to more than two groups Group 0 plus one other group Since group commands address multiple instruments they do not allow replies A command that ordinarily generates a reply does not generate a reply when sent as a group command Not all IMM commands are allowed with group commands For example all commands that start with Get are disabled because these commands are not useful without a reply some Set commands are also disabled If a blocked group command is transmitted there is no error message but the command is not executed in the remote instru
58. e ee ee ee ede ee EARE ee Ge ee ee Ge EEE ee ee ee ee ee ee ee ee ee 36 11 41 Contis Type T Gesie RE EE EE TE OE EE EN 36 11 4 2 Config Type 1 Blocked Commands esse see ese ese ee ee ee ee Ge Ge GRA GRA RA GR Re ee ran ee E ee Ge 37 11 4 3 Contig Type 2 Command iss sterte ke seks etse bee ere ae a be adeaublstancetdboldctelstaceteclatuesslels 37 11 5 DETAILED COMMAND DESCRIPTIONS iria sees esse ee ee ee se ee ee ee se ee ee ee ee ee EAN ee EEEE ee Ge ee ee Ge ee ee ee ENARA EEEE Ge ee 39 11 6 CONFIG TYPE 2 SET COMMANDS ES Te Se Gee ties Eon Ge Ee Ge Se Ee ED See Es Ge Ee EG eN We nti Ge ee Gee Gee thie ue Es Ge ei ee bes 55 12 INTERFACE MODE SHORTCUTS etes eie Re Es Ge Ne bes Re Gee Wee eo Nege Gee ie ve ee Rees ee ode deed ge Gee bee ee ese 62 13 ELECTRICAL SPECIFICATION scssssisvssssssssossostswonssdstscenstinnsatoisesesacndctnonatbdseqesaiesveussavbecastieoseussesasodesievecatbabeato 63 13 1 IMM CONNECTOR DESCRIPTION naiara et eA EAA EE ATARE A eI E A Raae ARER A i 63 13 2 HARDWARE I O LINE CHARACTERISTICS petiere isein ee se ee ee ee se ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ede ee EAEE ee aE ee ee ee 64 13 3 ABSOLUTE MAXIMUM RATINGS oie se Se Ese cc SS Ee De se GE eeu ck Ee ese de oe Ses Ee Me Ge ee Es Tee ck Ee NETE De se Es gee ate 64 15 4 POWER SUPPEY INPUT a A Gas Oh GE A en as 64 13 3 POWER CONSUMPTION ESTIMATES noia oct 65 14 FIRMWARE REVISION HISTORY sie es sees soos esse des ses sees sede sesse Ee sees sede seek bed
59. e in Host Service Mode 5 1 2 Entering Host Service Mode with Serial Line Transition If EnableSerialIMMWakeup 1 the IMM enters Host Service mode in response to a high low transition on the serial input logic level or RS232 Enable disable this feature with SetEnableSerialIMMWakeup Note that EnableSerialIMM Wakeup cannot be set to 0 if EnableSignalDetector is set to 0 and vice versa This prevents the IMM from entering a state from which it cannot wake up 5 1 3 Entering Host Service Mode with HostFlag Transition If EnableHostFlagWakeup 1 the IMM enters Host Service mode in response to a low high transition on the HostFlag input If EnableHostFlagWakeup 1 the IMM also wakes up in response to a static high condition on HostFlag when it prepares to go to sleep this may occur when the IMM wakes in response to IM line signals even if no commands address the IMM When EnableHostFlagWakeup 1 and the IMM is in Host Service mode the IMM will not time out after 2 minutes when HostFlag is high Users may hardwire HostFlag high to guarantee the IMM will not exit Host Service mode Enable disable this feature with SetEnableHostFlagW akeup 5 2 Sending Commands from Host to IMM After waking the IMM and receiving wakeup confirmation prompt and or IMFlag pulldown the host may send commands to the IMM Bytes sent to the serial port are stored in the IMM command buffer until the command is terminated If the IMM command buffer overflows an e
60. e memory in Sample Data e HostFileSummary Total amount of data in memory and checksum for Host Data File e DiscoveredBy Serial number of device that has identified this IMM in a line discovery process There may be multiple instances of this tag The tag may be removed in future firmware revisions e _LineStatus Captured or idle Section 12 IMM Commands HostFileAppendLine Append line to Host Data File Allowed from Host Yes IM Yes Group Yes Format hostfileappendline data 00hostfileappendline data IG 1 hostfileappendline data Argument Data to be added to the Host Data file Modifies Host Data File Requires Nothing Effects Adds data following the colon to the end of the Host Data File The amount of data stored with this command is limited by the length of the Command Buffer Returns OVERFLOW Error if insufficient memory is available to store the data Example IMM gt hostfileappendline this is a test lt Executed gt HostFileErase Erases the contents of the Host Data File Allowed from Host Yes IM Yes Group No Format hostfileerase OOhostfileerase Modifies Host Data File Requires Nothing Effects Erases data from the Host Data File Returns lt ConfirmationRequired gt Example IMM gt hostfileerase lt WARNING gt lt Contents of HostFile will be
61. e se ee se ee Ge ee AR ee AR TENEAN ee AR ee AR ee ieS ee ee ee ee ee 26 8 4 TERMINATING COMMAND TO HOST iese ees se ee ee ee se ee ee ee ee se ariin rna inarin Re ed AR ee AR rE Ee Re ee ee Re E ee ee 27 S29 PHOST do IRIS EG RATO 27 SOL Host Echa A Ee N lt n 27 8 52 Termination of Host Reply Gee se rn nadaa Ge ENE eed SeSe koe daci n 27 8 5 3 Termination Character from HOS esse se ee es ee ee ee Ge Ge GR RA a ee ee ee ee ee Ge Ge Ge RA ee ee 28 8 3 4 HostElas Transit Om GR N OR EO OE EE EO EE ER 28 8 5 5 Inter character Delay Termination THoSt ese esse se esse ee ee ee Ge ke de ee ee ee Re ee AA Ge cc ee ee Ge Ad ee ee ee 28 5 6 Host Return to Sleep i s ai ss se Re Eed ee Ps die EE GE Gee Gee Gee Eed ae GE SEG Re ee RD PES SE ER ER Ee 28 8 6 TIMEOUT PARAMETERS IN IM SERVICE MODE ese ees se se ese ee se ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee de ed ee ee Re ee ee 28 8 6 1 THost0 Maximum Wait for Wake up Confirmation sesse esse ee sees see ee ee ee ee ee ee ee Ge Ge Ge ee 29 8 6 2 THostl Delay after CONDS 29 8 6 3 THost2 Maximum Wait for Start of Reply 0 0 eee esse esse es se ee Se Ge ee Ge Ge ee ee ee ee ee Ge Ge RA ee 29 Table of Contents 8 6 4 THost3 Maximum IM Reply Transmission Time esse esse ee se ee sees ese ee Ge ee ee ee ee ee Ge Ge Ge Re ee ee 29 8 6 5 THost4 Inter Character Delay Timeout sesse esse esse es see ee Ge GR AG GR ee ee ee ee ee Ge Ge Ge ee 29 8 6 6 T
62. e se ese ede soda es eke gees sg es ee ge ae e ie be Ee see 66 15 SPECIFICATION REVISION HISTORY eus see ssee ese esse esse esse esse esse es see Bee BEG Ede Ge Ge GE Ge Ee Ee ee ee See Bee EG Eg 68 ie EE EE EE EE EE EE EE EE 69 Tables Table 4 1 Error Types ME EE N ER ER EER EE OE EE 16 Table 5 1 Summary of Host Service Mode Interfacing sesse esse esse esse ee se ee Se de Ge GR ee Ge Ge ee ee ee ee ee ee 19 Table 8 1 Summary of IMM Host Interface Options in IM Service Mode cece see se se ee ee ee ee ee Ge 25 Table 12 1 Command Addressing TYDeS iese RES Ge ee SE REGS Ge Ke GE REG ve SEE LESSE oek See Ge Ve RGN ee GR ese iaaa e atg 34 Table 12 2 Commands Blocked from Group Addressing iese esse esse ee ee Ge Ge GR GR GR Re ee ee ee ee ee se 36 Table 12 3 SIM Commands Described in SIM Documentation iese esse see se Ge AG Ge ee ee ee ee ee Ge 36 Table 12 4 SIM Commands Not Implemented in Config Type 1 sees sees se ss SA SR Ge ee ee ee ee ee se 36 Table 12 5 IMM Commands Blocked in Config Type 1 esse esse esse esse ee se Se Ge GRA GR GR ee ee ee ee ee ee ee 37 Table 12 6 Config Type 2 Command Summary 0 cee sesse se ee ee ee Se Ge Ge GRA RA GR Re ee ee ee ee ee Ge 37 Table 14 1 J1 Pinout R 232 Logic Level Seal enie EE ER Ee Pe ce 63 Table 14 2 J1 Pinout RS AS critica id ii isc incas 63 Table 14 3 J2 Pinout same for RS 232 and RS 485 versions sees sees se ee Ge ee GR ee GR RA ee Ge ee ee ee ee ee 63 Table 14 4 Minimum Maxi
63. e stored in Sample Data Returns lt Executed gt when data entry terminated SampleAppendLine Append data to current sample in Sample data Allowed from Host Yes IM Yes Group Yes Format sampleappendline data 00sampleappendline data Gl sampleappendline data Argument data to append not binary CRLF terminatin is not added to sample Modifies Sample Data Requires Nothing Effects Adds data following the colon to the current sample The amount of data stored with this command is limited by the length of the Command Buffer Returns OVERFLOW Error if more bytes arrive than can be stored in Sample Data Example IMM gt sampleappendline this is a test lt Executed gt SampleErase Erases a single Sample with specified SampleID sample must be the oldest sample in Sample Data Allowed from Host Yes IM Yes Group No Format sampleerase FF 00sampleerase FF Argument A hex SampleID must follow the colon up to 8 characters for a 32 bit number The sample ID of hte sample to be erased must be specified to avoid accidental deletion of samples Modifies Sample Data Requires Nothing Effects Erases the Sample with specified SamplelD if it is the oldest sample in the Sample Data structure Returns INVALID ARGUMENT Error if there is not a properly formatted SampleID after the colon Returns INVALID ARGUMENT Error if the specified SampleID does not exist Returns lt Executed gt Section 12 IMM Commands
64. ecking for other transmitting devices If the line is captured when this command arrives the IMM releases the line for 100mS and attempts to capture it again Returns FAILED error if another device is transmitting on the line no error if the line is captured Returns FAILED error and POWER FAIL error if the transmit voltage is too low This condition can be caused by a bad cable coupler Returns FAILED error if a DPSK Exclusive is in process Example IMM gt captureline lt Error type FAILED msg LINE BUSY gt lt Executed gt Example IMM gt captureline lt Error type FAILED msg Low Transmit Voltage low battery or bad coupler gt lt Error type POWER FAIL msg Transmit Voltage Vtx 1 9 gt lt Executed gt Data Return host reply of last GData command legacy Use GetReply in new designs Allowed from Host No IM Yes Group No Format 00data Modifies Nothing Requires Nothing Effects Returns data Returns Contents of the GData reply buffer prefixed with the instrument ID Example O1DATA lt RemoteReply gt 01 this is the gdata reply lt RemoteReply gt lt Executed gt Disc Execute the line discovery process This is a provisional command the format and or response may provisional change upon further testing and development Allowed from Host Yes IM No Group No Format disc Modifies Discovered by list of all IMMs on the line Requires The IM line must be captured Effects Uses the l
65. ection 8 6 Timeout Parameters in IM Service Mode SetTHost3 is allowed from the host the IM and as a group command Default is 12000 for all Interface modes SetTHost4 x x THost4 inter character delay timeout 5 3000 units are tens of milliseconds THost4 100 means 1 second Described in detail in Section 8 6 Timeout Parameters in IM Service Mode SetTHost4 is allowed from the host the IM and as a group command Default is 500 for all Interface modes SetTHost5 x x THost5 IMFlag hold after reply termination 5 3000 units are tens of milliseconds THost4 100 means 1 second Described in detail in Section 8 6 Timeout Parameters in IM Service Mode SetTHostS is allowed from the host the IM and as a group command Default is 5 for all Interface modes SetTModem2 x x TModem2 maximum wait for start of IM reply 0 3000 units are tens of milliseconds TModem2 100 means 1 second Described in detail in Section 5 5 Timeout Parameters in Host Service Mode SetTModem2 is allowed from the host the IM and as a group command Default is 500 for all Interface modes SetTModem3 x x TModem3 maximum IM receive time 0 60000 units are tens of milliseconds TModem3 100 means 1 second Described in detail in Section 5 5 Timeout Parameters in Host Service Mode SetTModem3 is allowed from the host the IM and as a group command Default is 18000 for all Interface modes SetTModem4 x x TModem4 Configuration Type 1 max
66. ee ee ee ee ee ee 20 5 5 1 TModem2 Maximum Wait for Start of IM Reply 0 ee esse esse ee se Ge Ge GR Ge GR ee ee ee ee ee ee Ge 21 5 5 2 TModem3 Maximum IM Receive Time iese sesse es ee ee ee Ge Ge Ge GRA RA ee ee ee ee ee ee 21 10 BL n EA MO ER N N N EE N OE ins ida 21 5 6 EXITING HOST SERVICE MODE eie esse ee ee ee se ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ede ee ee ede ee Ge ee ee Ge aE ee ee ee ee Ge ee ee RA ee ee ee 21 6 SENDING COMMANDS TO REMOTE DEVICES uese sesse se se se esesese sesse se Se se oge gese see ge se Se Se oge gese ese gese Se Se ege gese ese ge se se se ene 22 61 CAPTURING IM LINE 6 ee A A A ee Ge che DA Oe EE ede SE Dene AE ee oe es ED 22 6 2 SENDING DATA RE RE EE ER EE N NE 22 6 37 SENDING WAKE UP TONE eens een is Seel Ee se Ee dee EE ese Ee ee AE tabi Ge EAN ee se Ee ie See ke Ee oe Ee En SE gee Ek ee ek ke ev 22 6 4 RELEASING IM EINE es Ee SEG ee Se GE GR Re Saintes a oe ee De ee ets 22 7 RECEIVING COMMANDS FROM REMOTE DEVICES se se se se esese sesse se se se ese ge gese ese se Se Se oge gese see gese be Se ese gese ese se se se se ese 23 FAL WAKING IMM BROM IM LINE Es Oe nis SEE ee Re Ee E es ee ON oe Ge ee ge Gee oe ee Bed Se ee De De se ee geb ee ed ee ee EA Se Ed 23 7 2 RECEIVING NONEHOSTCOMMANDSL see cova sees e GES SR ee SEN EE eie A Eg oge ee Gee Eg Gee ube ctevehsccduveroceaeaed s 23 7 2 1 Receiving Group and Global Non Host CommandsS sessie esse esse ee se se GR Ge SR
67. een periodic uploads by the buoy controller typically once per hour The buoy controller may then use the Exclusive command when uploading the larger data set This reduces the total active time of the inductive mooring and extends battery life for other IM instruments on the mooring The Sample Data structure allows a variable maximum number of logical Samples up to 40 each containing a variable number of bytes up to the full available memory space 16KByte Sample Data is read and write accessible from both the serial port and the inductive modem A Sample Data summary is available with length and checksum for each sample in memory Responses to the GData command may be stored in the Sample Data structure If EnableGDataToSample 1 the response to GData is diverted from the GData Reply buffer and is added as a new Sample in SampleData This frees host devices from the 127 byte limit of the GData Reply Buffer A Sample ID is automatically assigned to each Sample as it is created The Sample ID is a 32 bit unsigned integer starting at 1 and incrementing each time a sample is created There is no way to reset the assignment of Sample IDs in an IMM 10 1 Adding and Appending Samples There are three ways to add or append samples e The SampleAdd and SampleAppend commands allow addition of binary data These commands are accepted only from the host not from the IM interface e The SampleAddLine and SampleAppendLine command These
68. ently specified to allow designers of the high level systems to easily interface the IMM model with their systems The IMM conceptual model serves as part of a bridge between the specific features and limitations of inductive modems and oceanographic instruments and the more generalized requirements of higher level network models and interfaces Laying the foundation of this bridge now helps prevent changes in the IMM s interface to host instruments Addition of Host IDs Host Data and Sample Data storage to the IMM and potential for XML support in this data may allow host devices to conform to high level interfaces without changing their firmware This may prove valuable for system integrators who have limited influence over the firmware of the instruments generating data The IMM s conceptual model fundamentally differs from that of an instrument e It does not perform any environmental measurement or collect any scientific data directly e It is capable of controlling and communicating directly with an instrument or other device some instruments may have this property e It is capable of communicating with a network of instruments through the IM line There is an attractive logical split between surface devices and underwater devices The IMM model intentionally avoids making any conceptual split on this basis This split may impose unnecessary limitations on the system that may interfere with future expansion RS 232 and logic
69. eply to a command measured from the arrival of the command in the IMM to the termination of the IMM s transmission of the host s reply This time limit acts on the 1200 baud reply on the IM line as well as the higher speed host serial port If the host fills the IMM s 8K reply buffer at 9600 baud the IMM transmits from that buffer to the IM line at 1200 baud until either the buffer is empty or the THost3 timeout occurs Any data remaining in the reply buffer after the THost3 timeout is discarded When a THost3 timeout occurs the host reply is cut off an Error is forwarded to the IM line and a THost3 event is logged in the Event Counters Valid values for THost3 are from 100 to 18000 units are tens of milliseconds THost3 100 means 1 second 8 6 5 THost4 Inter Character Delay Timeout Inter character delay is the time between arrivals of individual characters in streaming serial data The inter character delay timeout forces the end of the host s command or reply This is useful with host devices that do not support termination characters in their replies The inter character delay timeout is enabled only after the arrival of the first character from the host THost4 timeouts are reported as Errors only if the DebugLevel is set to 6 or higher Valid values for THost4 are from 5 to 6000 units are tens of milliseconds THost4 100 means 1 second Section 8 IMM Host Interface in IM Service Mode 8 6 6 THost5 IMFlag Hold after Reply Termi
70. esse ses ssgssss sees ses esg sege se ee se esse see ese esse ees ese egg sege se egg eg ge ge eg ee Eg ee 3 TABLE OF CONTENTS srt AA Soe eed A ES Ess se ee Gegee 4 1 IMM OVERVIEW AND CONCEPTUAL MODEL ee sees esse se se ese ese se ee ege ee se oge gee ge se oge see ge se oge see ge se eg ese se ee oge ee se see gegee see 7 1 1 SCOPE AND INTENT OF IMM CONCEPTUAL MODEL iese esse ee ee es se se ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee 7 2 IMM CONCEPTUAL AAA siese rods geed ge Gee BRek ve Res ee ee es Doe se ees ee gese ee use Ses ee ei Dee Oe ees 9 Dale HARDWARE n ee RED Ge OE GE RE RE DR Re otc Oc en ee es 9 AK GO ER RE EE EE EE ON AE N N 9 2 1 2 DPSK Transceiver with Tone Detect sesse esse es se de ee ee GR RA aa AR AA Ge AA ee Ge Re AA de ee ee ee 9 RE Signal Detector OE EL N TE EE EE OE A EE ER A 9 21 4 Induetive Cable Couplef st Ee SE EE EES Leen he Ses ese a ee 9 ZES Power Input ses EE RE e EE EE GE ER AA OE 10 PRED HostElas Digital Inputs EE ER EE EE EE RE EE NT 10 217 IMElag Difital Output see EE ee EER GE EE Ee Ee OE eN ee ee n ge Gee oe ee Ea ees gee ee ge 10 2 2 NONVOLATIEE STRUCTURES TAE NA EE A Ge ee ee ROO De eg MRO 10 2 2 1 Hard ware Data is dees de se Se Gee Ge daa io 10 2 2 2 Contisuration BEER OE RA EE ER woes 10 22 3 Status BE IE RE ER dg a e aae iE cheats 11 2 24 ByentE GUNS a De EE a de Ed a a tet 11 EE GE DETE 9 oi EE EE N AE ES RE N 11 EA ie BENE N EE EE N N RO N E
71. g command is extremely unlikely Incoming wake up tones are reported to the host only if EnableToneDetect 1 Reporting a wake up tone has the same effect as a remote device sending iiWAKE UP TONE DETECTED This means the IMM initiates communication with the host to report a wake up tone in the manner in which it would report an incoming command Use SetEnableToneDetect to enable disable detection of wake up tones 7 4 Receiving Host Commands When the IMM receives a host command typically starting with the IMM wakes the host see Section 8 IMM Host Interface in IM Service Mode and then the IMM forwards the command to the host If a reply is required the IMM then relays the host reply to the IM line There are several optional methods of waking up the host using the serial port or hardware handshake lines There are also several timeout parameters governing communications with the host The way in which the command is addressed generally determines whether or not a reply is required Section 7 Receiving Commands from Remote Devices 7 4 1 Device ID and Serial Number Addressed Host Commands A command addressed with a device ID has the prefix ii for example 01startsampling A command addressed with a serial number has the prefix Snnnnnnnn for example S70000009 startsampling Commands addressed with these methods always have a reply The reply may be empty if the host does not provide any data or in the special case whe
72. gnal Example IMM gt measurelinesignal lt LineSignal S 42 gt lt Executed gt PwrOff Tell IMM to go to sleep Allowed from Host Yes IM Yes Group Yes Format pwroff 00pwroff IG1 pwroff Modifies IMM operating mode 37 When the Host sends the ID command to the IMM the IMMsends the global ID to the IM line If an ID is returned it is the ID of a remote device not the IMM connected serially to the Host Section 12 IMM Commands Requires Nothing Effects Unconditionally switches the IMM from Host Service or IM Service to Sleep mode after a 100mS delay When received from the Host sends the global IM command PwrOff to the IM line if the line is captured before powering off Returns lt Executed gt Example IMM gt pwroff line captured lt Executing gt lt Executed gt Example IMM gt pwroff line not lt Executed gt captured ReleaseLine Releases the IM line allowing other devices to use it or REL Allowed from Host Yes IM No Group No Format releaseline Modifies DPSK Transceiver State Requires Nothing Effects Stops transmitting the IM carrier Automatically sends PWROFF to the IM line before releasing the line Returns lt Executed gt ResetEC Resets all event counters to zero Allowed from Host Yes IM Yes Group Yes Format resetec 1O
73. he break condition This feature is independent of IMFlag setttings x 0 Disable this feature SetEnableHostWakeupBreak is allowed from the host the IM and as a group command Default is 0 for all Interface modes SetEnableSerialIMM Wakeup x x 1 IMM wakes up in response to high low transitions on the serial input x 0 Disable this wake up Returns ConfirmationRequired tag and Warning tag if set to 0 SetEnableSerialIMMWakeup is allowed from the host and the IM Default is 1 for all Interface modes Note EnableSerialIMM Wakeup cannot be set to 0 if EnableSignalDetector is set to O This prevents the IMM from reaching a state from which it cannot wake up Section 12 IMM Commands SetEnableSignalDetector x x 1 Enable the IM signal detector The IMM wakes up in response to commands on the IM line x 0 Disable the signal detector Returns ConfirmationRequired tag and Warning tag if set to 0 SetEnableSignalDetector is allowed from the host only Default is 1 for Interface modes 1 2 5 6 7 8 9 12 13 and 14 default is O for Interface modes 3 4 10 and 11 Note EnableSignalDetector cannot be set to 0 if EnableSerialIMM Wakeup is set to 0 This prevents the IMM from reaching a state from which it cannot wake up SetEnableStripHostEcho x x 1 The IMM in IM Service mode automatically removes the host s echo of the relayed command if there is an echo x 0 The IMM does not strip any characters from the host rep
74. host responds to data from the IMM It does not apply in Host Service mode Termination characters received from the host in IM Service mode are not included in the reply unless the termination character is CRLF TermFromHost 254 8 5 3 Termination Character from Host The TermFromHost setting allows specification of a termination character or use of carriage return followed by line feed CRLF as a termination sequence The setting is recorded in a single byte termination code The IMM interprets any value less than 250 as a single byte termination character The IMM interprets 254 as CRLF and 255 as no termination The remaining values are reserved This feature operates independently of the other termination options except for the special case where THost2 0 where the termination character setting is ignored Use SetTermFromHost to configure the termination character for host replies The command requires a decimal number as an argument 8 5 4 HostFlag Transition If EnableHostFlagTerm 1 the host may terminate replies to commands with a low high transition of the HostFlag input This feature operates independently of the other termination options except for the special case where THost2 0 where the HostFlag termination setting is ignored Use SetEnableHostFlagTerm to enable disable HostFlag termination 8 5 5 Inter character Delay Termination THost4 Inter character delay is the time between arrivals of individual characters in stre
75. iled Command Descriptions Notes 1 Command descriptions define whether a command is allowed from the IMM s host from the Inductive Mooring IM line and or as a Group command Section 12 IMM Commands When addressing a single IMM through the Inductive Mooring the command formats shown are written for addressing the IMM by its ID Any command that can be sent to a single IMM in this way can also be sent by addressing the IMM with its serial number For example the format shown for transmission of GetCD through the IM is 0Ogetcd transmit command to IMM with ID 00 it is also valid to transmit this command as S70000019 getcd transmit command to IMM with serial number 70000019 ID Sets Device ID of remote device legacy Use SetDeviceID with serial number addressing in new designs Allowed from Host Yes Captured Line Only IM No Group No Format id 01 This is a global command that returns data It must not be used if more than one instrument is coupled to the IM line This command does not use reply tags Modifies Device ID of all instruments on the mooring Requires There must be exactly one receiving IM device on the mooring Effects Sets the Device ID Returns WARNING tag Returns ConfirmationRequired tag Example IMM gt id 01 lt RemoteReply gt lt WARNING gt Repeat Command to set id 01
76. ill be rejected as transmission errors and will not be executed This size limitation does not apply to replies to commands Section 3 IMM Operating Modes 3 Operating Modes Operating mode describes the action the IMM is performing at a particular moment it is not a user settable parameter There are four operating modes Host Service IM Service IM Receive and Sleep Power off might be considered an additional operating mode in some applications 3 1 Host Service The IMM enters Host Service mode when communication is initiated by the IMM s host In Host Service mode the host may send commands to the IMM to store data change settings or initiate communication with remote devices The IMM remains in Host Service mode until it receives the PwrOff command from the host or the 2 minute timer expires During Host Service mode the IMM cannot process commands arriving from the IM line Instead the IMM responds to properly addressed incoming IM signals with a lt Busy gt tag if the IMM is not processing a command from the host When the IMM processes a command from the host in Host Service mode the IM line is ignored The IM receive buffer is cleared after processing each command from the host 3 2 IM Service The IMM enters IM Service mode when any valid command including a command that relays data to the host arrives from the IM line The IMM remains in this mode until the command is executed When in IM Service mode the IMM doe
77. imum IM receive inter character delay before terminating reception of reply to bii command 0 3000 units are tens of milliseconds TModem4 100 means 1 second Described in detail in Section 5 5 Timeout Parameters in Host Service Mode This setting exists in IMM firmware V1 02 and later SetTModemd is allowed from the host the IM and as a group command Default is 100 for all Interface modes Section 13 Electrical Specification 12 Interface Mode Shortcuts Interface modes act as shortcuts for common interface settings in Configuration Data Setting an Interface mode changes the Configuration Data to support a particular style of host interface as defined in the table below There are currently only seven basic interface modes but separate numbers are assigned for the same configuration in RS 232 and in LLS Number Description RS232 Hardware Handshaki Host Instrument RS232 Serial Handshaking with Simple Host Instrument cda or san is 500 EERS EET FAR AE EE Ee EE el BREER bbb bbb sh bbb fsa gt bedel lll lo eo AA AE AA EE heks lk blok lok lo lo o lo Jo fo fo fs kosse koek fs REENEN ERNA 294 a Hits 120001500 5 500 ie MM gt a el bb kke ll elo ahe da 3000 12000 500 5 500 Logic Level Serial Serial Handshaking with Simple Host Instrument S gt elo Ae EJE 5 40 1000 12000 5 500 Logic Level Serial Hardware Handshaking with Simple Buoy Controller S gt M gt 1 1 1 a Ba EE 1200015 500 18000 1 Logi
78. ine Allowed from Host Yes Captured Line only IM No Group No Format sendgdata Requires IM line must be captured Section 12 IMM Commands Modifies IM line Effects Sends the global IM command GData to the IM line Returns NOT ALLOWED Error if the IM line is not captured Returns lt Executing gt lt Executed gt SendPwrOff Sends the global IM command PwrOff to the IM line Allowed from Host Yes Captured Line only IM No Group No Format sendpwroff Requires IM line must be captured Modifies IM line Effects Sends the global IM command PwrOff to the IM line IMM communicating with the host remains awake and line remains captured Returns NOT ALLOWED Error if the IM line is not captured Returns lt Executing gt lt Executed gt SendStayOn Sends the global IM command StayOn to the IM line to reset the 2 minute sleep timer for all IMMs on the line IMM communicating with the host is not affected Allowed from Host Yes Captured Line only IM No Group No Format sendstayon Requires IM line must be captured Modifies IM line Effects Sends the global IM command StayOn to the IM line Returns NOT ALLOWED Error if the IM line is not captured Returns lt Executing gt lt Executed gt SendWakeupTone Sends a 4 second wake up tone to the IM line or SWT Allowed from Host Yes Captured
79. ine discovery proves to generate a list of all IMMs on the mooring except the one executing the command Returns NOT ALLOWED error if the IM line is not captured Example IMM gt disc lt Discovery gt lt Discovered SN 7000020 gt lt Discovered SN 7000004 gt lt Discovery gt lt Executed gt EchoIM IM communications echo test Allowed from Host No IM Yes Group No Format 0lechoim text to echo Argument String to be echoed to the IM line Modifies Nothing Requires Nothing Effects Echoes the string back to the IM line Example Olechoim this is a test lt lt RemoteReply gt echoim this is a test lt RemoteReply gt Executed gt Section 12 IMM Commands Exclusive Requests devices other than the target to go to sleep for 2 minutes Use this command when transmitting from a SIM to an IMM Allowed from Host no IM Yes Group no Format use SENDEXCLUSIVE exclusive S70000019 instead exclusive 01 Argument Device ID or serial number prefaced with S of target Modifies DPSK Transceiver state Requires nothing Effects causes all IMM s on the IM line other than the addressed device to enter a low power mode for two minutes This saves power in applications with long data transfers Example S gt exclusive 01 EXCLUSIVE 01 ACCEPTED
80. intended for system debugging Users should avoid creating dependencies on the content of the msg parameter Any command processed in Host Service mode or received from the IM line in IM Service mode may result in one or more Error tags The IMM may send more than one Error tag in response to a single command ll The Error tag may be appended to host replies to incoming commands if there is an error in interacting with the host such as a timeout condition 12 Config Type 1 does not use Executed tags for commands that mimic SIM behavior In Config Type 2 the ID command does not use Executed tags 15 Note that a command sent to a remote device may get an Executed tag from the remote device within a lt RemoteReply gt tag followed by an Executed tag from the IMM itself which will be outside the RemoteReply tag Section 4 Reply Tags and XML like Formatting Table 4 1 Error Types Type Description INVALID e Command not recognized by instrument COMMAND e Instrument command buffer overflowed IMM 127 byte buffer e Improperly formatted argument INVALID e Argument out of fixed permissible range ARGUMENT e Argument out of dynamic permissible range IMM sample data attempt to download data for sample ID not in memory e Valid command not allowed in current operating mode or configuration e g not allowed NOT ALLOWED while logging or not allowed when IM line not captured e Valid command not allowed via
81. is High and e 2 minute timeout 2 seconds EnableHostFlagWakeup 1 e Prompt 5 1 1 Entering Host Service Mode with Power Cycling This is intended for applications like simple buoy controllers where all IM activity is initiated by the buoy controller If EnableHostServeOnPwrUp 1 the IMM automatically enters Host Service mode when power is applied Before turning off power the host should send the PwrOff command to the IMM and wait 100 milliseconds Power must remain off for at least 15 seconds to guarantee complete power down If the logic level serial input is used the serial line must be either floating or in a logic low state or the IMM cannot properly power down This is a good conservative approach to IM system design because it guarantees a clean software state in the IMM each time the buoy controller initiates communication Enable disable this feature with SetEnableHostServeOnPwrup S Host Service mode can also be initiated by power cycling the IMM if EnableHostServeOnPwrup 1 Host Service mode is typically completely disabled in simple instruments that send data only in response to incoming commands from the IM line 17 The IMM ignores any strings from the host with fewer than 3 characters excluding the termination sequence S Systems with high input voltages should wait longer than 15 seconds before re applying power to the IMM A system with 30V input should wait 1 minute Section 5 IMM Host Interfac
82. lagConfirm is allowed from the host and the IM Default is O for Interface modes 2 4 6 7 9 11 13 and 14 default is 1 for Interface modes 1 3 5 8 10 and 12 SetEnableHostFlagTerm x x 1 IMM interprets a high low transition on the HostFlag signal to terminate a transmission from the host x 0 Disable this termination SetEnableHostFlagTerm is allowed from the host and the IM Default is O for Interface modes 2 4 6 7 9 11 13 and 14 default is 1 for Interface modes 1 3 5 8 10 and 12 Section 12 IMM Commands SetEnableHostFlagWakeup x x 1 IMM wakes up in response to low high transitions on the HostFlag digital input Also IMM wakes up in response to a static logic high condition on the HostFlag signal when it is about to enter sleep including after receiving commands from the IM line with non matching address x 0 Disable this wake up SetEnableHostFlagTerm is allowed from the host and the IM Default is O for Interface modes 1 2 4 6 7 8 9 11 13 and 14 default is 1 for Interface modes 3 5 10 and 12 SetEnableHostPromptConfirm x x 1 IMM interprets reception of a prompt from the host as confirmation of the host wake up x 0 Disable this confirmation SetEnableHostPromptConfirm is allowed from the host the IM and as a group command Default is 0 for Interface modes through 6 and 8 through 13 default is 1 for Interface modes 7 and 14 SetEnableHostServeOnPwrUp x x 1 IMM enters Ho
83. lion erase write cycles The Sample ID allows a rough estimate of the number of cycles the EEPROM had accumulated If an instrument records 6 samples per hour each of which uses the entire memory space of the EEPROM manufacturer s data suggest 99 9 of EEPROMs will last more than 20 years Section 10 Using Sample Data lt Executed gt 10 3 Reading Samples Samples are read with the SampleGetData or SampleGetLast command e SampleGetData allows data retrieval by sample ID returning the data for a specific sample ID The argument for SampleGetData is a hexadecimal sample ID number e SampleGetLast retrieves data for the most recently added sample which has the highest sample ID Data is output is enclosed in SampleData tags including parameters for the sample ID and CRC code Example IMM gt samplegetlast lt SampleData ID 0x7 LEN 16 CRC 0x0 gt This is the data lt SampleData gt IMM gt samplegetdata 7 lt SampleData ID 0x7 LEN 16 CRC 0x0 gt This is the data lt SampleData gt 10 4 Erasing Samples The Sample Data structure requires that samples be erased in the order in which they are created This means the lowest Sample ID in memory must be erased first There are three commands for erasing samples e SampleErase only erases the oldest sample in memory which has the lowest sample ID The sample ID of the sample to erase must be specified this prevents accidental deletion of samples
84. ly SetEnableStripHostEcho is allowed from the host the IM and as a group command Default is 0 for all Interface modes SetEnableToneDetect x x 1 IMM wakes the host when an incoming wake up tone is detected x 0 Disable IM notification of incoming wake up tones SetEnableToneDetect is allowed from the host the IM and as a group command Default is 0 for all Interface modes Example Wake up tone is enabled in IMM1 IMM1 put to sleep IMM gt setenabletonedetect 1 lt Executed gt IMM gt pwroff lt Executed gt nother IMM 2 sends a wake up tone to the IM line M gt sendwakeuptone Executing gt Executing gt Executing gt Executing gt Executed gt AAA A AH gt hile wake up tone is sent from IMM2 IMM sends this to host M gt WAKE UP TONE DETECTED M gt WAKE UP TONE DETECTED M gt WAKE UP TONE DETECTED continues to signal until tone stops M gt WAKE UP TONE DETECTED Ho Bu SetGDataStr x x GDataStr value 1 32 characters which is sent to the host in response to the GData command SetGDataStr is allowed from the host the IM and as a group command Factory default is GDATA The GData string is not affected by a change in Interface mode SetGroupNumber x x Group membership of the IMM 1 9 or 0 Group 0 is pre defined as the group of all instruments a O entry for this parameter indicates the IMM is not a member of any othe
85. ments Table 11 2 Commands Blocked from Group Addressing SetConfigT ype TXTest All commands that start with Get SetInterfaceMode EchoIM All commands that start with Test SetBaudRate SetEnableSignalDetector All commands that start with HostFileGet SetDeviceID SetEnableSerialIMM Wakeup All commands that start with SampleGet SetSerialType SetEnableHostFlag Wakeup 11 4 Command Summary Tables 11 4 1 Config Type 1 Commands Config Type 1 emulated the SIM coupled and SIM direct modems Config Type 1 does not allow incoming commands from the IM line signal detector is disabled Several Config Type 1 commands either do not exist in Config Type 2 or behave differently from commands with the same name in Config Type 2 These commands are designed to mimic the behavior of the older SIM board Table 11 3 SIM Commands Described in SIM Documentation and available in Config Type 1 PwrOn HHMMSS GData PwrOff MMDDY Y Dataii StayOn DDMMY Y Table 11 4 SIM Commands Not Implemented in Config Type 1 SIM Command Comments Baud Use SetBaudRate DataNNMax No analogous setting for IMM RelayMax Use SetTHost3 units are tens of milliseconds EchoOn Use SetEnableEcho 1 EchoOff Use SetEnableEcho 0 AutoPwrOn No analogous setting for IMM BinaryGap Use SetTHost4 units are tens of milliseconds Section 12 IMM Commands 11 4 2 Config Type 1 Blocked Comman
86. mmand removes some of the older samples Section 12 IMM Commands 11 IMM Commands This section describes the IMM commands Some commands are valid only when received from the host others are valid from the host or the IM line Many commands are valid only in a particular Configuration Type 11 1 Command Addressing Many IMM commands are executed by the IMM physically connected to the host sending commands These are called Direct commands It is important to distinguish between Direct commands and IM commands IM commands are transmitted over the IM line and executed in a remote device IM command addressing is the process of identifying the device or devices on the inductive mooring that should execute a given command The host addresses commands by prefixing them with either the or character and the Device ID serial number or group number the command is intended for The format for these prefixes is shown in the table of Command Addressing Types Commands prefixed with an individual ID or individual serial number address a single instrument Commands prefixed with a group number address a pre defined group of instruments A small number of IMM commands cause transmission of global commands which address all instruments on the mooring Global commands do not use the or prefixes Table 11 1 Command Addressing Types Prefix for Prefix for Command Type Delivery to Delivery to Comments yP re
87. mmands removed hhmmss mmddyy ddmmyy 12 Added Gx Mark commands sending and receiving 13 Removed ERROR_DPSK_UART_LOCK 14 Added executing tags to captureline reply 15 Testcablecoupler commands and GETSD no longer cause tx power level to temporarily switch low 16 Interface mode 7 now has enablehostserveonpwrup 0 17 PCBtype gt 3 enables reset pin pin must be held low for 1 second on startup All changes of IMFLAG conditional on enableAutoIMFlag setting Added error for invalid argument on setIMFlag Warning added to hostfileerase command Host service 2 min timeout changed to lt TIMEOUT msg HostService 2 min timeout gt Event ERROR_IM_CMD_MODE removed Event ERROR_IMM_BUSY added when the IMM sends a lt busy gt signal CRLF from host acts as recognized command returning lt Executed gt and resetting host timeout instead of just giving a new prompt lt Executing gt tags removed from Config Type 1 Corrected parsing of 00StayOn command Version 1 02 1 Modified timing of IM replies in Configuration Type 1 bii binary commands This should not cause any performance change 2 Removed inappropriate TIMEOUT error returned after Configuration Type 1 bii binary commands with normal inter character delay termination 3 TModem3 maximum value changed to 600 seconds 4 Added TModemd setting for Config Type 1 use 5 Config Type bii command inter character delay timeout now activates after reception of
88. mote IMM remote Host Es ms ss ii ID of remote IMM ii 0 99 dadivduak TD i gi Note ID must be two digits i e 00 is correct 0 is incorrect Individual ISx Sx x serial number of remote IMM 100 lt x lt oy Serial Number n group number of remote IMMs 0 9 with O being the group of all IMMs Notes 1 A Group on an 1 G prefix must be upper case for firmware versions prior to 1 06 2 Group commands do not allow replies Global commands do not use or Global Global commands that have replies such as ID and ID are allowed only if there are exactly 2 IM legacy devices on the mooring Example an IMM in the buoy and in 1 instrument Global commands that have replies support older instruments and should be avoided when possible Not d Direct Not applicable applicable Command sent by the IMM s host e g CaptureLine 11 2 Sending Commands IM commands can be sent only when the IM line is captured An attempt to send a command with a or prefix when the line is not captured results in a NOT ALLOWED Error Firmware versions prior to 1 06 listened for a reply to group commands if the G prefix was lower case This firmware error was corrected in version 1 06 Section 12 IMM Commands 11 2 1 Interrupting Replies to IM Commands After sending an IM command the host can interrupt the reply by sending the escape character 0x1B This is useful if the host believes the remote devic
89. mpleList gt lt Executed gt SampleGetSummary Retrieves a summary of the data in Sample Data Allowed from Host Yes IM Yes Group No Format samplegetsummary 00samplegetsummary Modifies Nothing Requires Nothing Effects Returns data Returns A summary of the data in Sample Data in a SampleDataSummary tag Example IMM gt sampleget summary lt SampleDataSummary NumSamples 2 TotalLen 28 FreeMem 16356 gt lt Executed gt SendBreak Sends a serial break to the host Allowed from Host No IM Yes Group Yes Format 00sendbreak Gl sendbreak Modifies Host Serial interface Requires Nothing Effects Sends a serial break to the host Returns lt Executed gt SendExclusive Requests devices other than the target to go to sleep for 2 minutes use EXCLUSIVE command when transmitting from a SIM Allowed from Host Yes IM no Group no Format sendexclusive 01 Argument Device ID or serial number prefaced with S of target Modifies DPSK Transceiver state Requires nothing Effects Causes all IMM s on the IM line other than the addressed device to enter Sleep mode for two minutes This saves power in applications with long data transfers Example IMM gt sendexclusive 07 lt RemoteReply gt EXCLUSIVE 07 ACCEPTED lt RemoteReply gt lt Executed gt Example IMM gt sendexclusive S70000047 lt RemoteReply gt EXCLUSIVE S70000047 ACCEPTED lt RemoteReply gt lt Executed gt SendGData Sends the global IM command GData to the IM l
90. mum and Typical Resistance Values sees sees see se ee ek Se ee ee ee ee ee ee ee 64 Table 14 5 Minimum and Maximum Voltages 00 iese se se se ee ee ee ee Ge Ge GRA RA GR ee ee ee ee ee ee Ge 64 Table 14 6 Power Consumption Measurements Firmware Version 0 98 ees sees se ee Ge RA ee ee ee 65 Section 1 IMM Overview and Conceptual Model 1 IMM Overview and Conceptual Model The IMM is a low power microprocessor peripheral that interfaces new or existing instruments capable of logic level serial RS 232 or RS 485 to inductive moorings IMM telemetry is compatible with existing instruments and Surface Inductive Modems SIMs from Sea Bird The IMM includes advanced capabilities that allow instrument self discovery inductive line status reporting cable coupler performance measurement reduced restrictions on IM host devices and a more convenient and robust communications interface Most older Sea Bird instruments require firmware or hardware upgrades to use these advanced features but use of advanced features will not disturb older instruments on the same mooring The goals of an inductive modem system are e Serve as a minimally restrictive and highly reliable communications link e Provide specific features required to achieve scientific goals in spite of any limitations of the communications link e Provide simple and stable interfaces to help developers make reliable maintainable and reusable software at any scale e Provide adv
91. nation Some Hosts require extra time to power down after replying to a command especially if the IMFlag signal controls the host power supply THost5 provides an adjustable delay between termination of the host s reply and release of the IMFlag by the IMM The delay does not apply to host initiated communication Valid values for THost5 are from 0 to 3000 units are tens of milliseconds THost5 100 means 1 second 8 When the host initiates communication with the IMM the IMFlag activates to signal IMM wake up and deactivates to signal IMM entering Sleep mode or IM Receive mode if there is an IM signal present at the end of Host Service mode Section 9 Handling of Binary Data 9 Handling of Binary Data The low level IM transmission protocol reserves some characters to mark the start and end of transmissions specify addressed instruments and perform other IM specific functions These functions are abstracted from the user as much as possible to reduce system complexity Unfortunately the technique used prevents true binary data transmissions When data sent by a host for transmission over the IM line contains characters reserved by the IM transmission protocol these characters are automatically replaced by two characters similar to the r and similar codes used in many programming languages This transformation increases the number of bytes that must be transmitted thus increasing the expected transmission time A relativel
92. nd Default is IMM for all Interface modes SetSerialBreakLen x x Length of a serial break in tens of milliseconds 1 255 corresponding to 10 milliseconds to 2 55 seconds Not affected by the baud rate SetSerialBreakLen is allowed from the host the IM and as a group command Default is 5 for all Interface modes SetSerialType x x 0 Logic Level Serial x 1 RS 232 x 2 RS 485 Note that RS 485 requires a special hardware option Returns ConfirmationRequired tag and Warning tag SetSerialType is allowed from the host and the IM Default is 1 RS 232 for Interface modes 1 7 zero for 8 14 SetTermFromHost x x Termination character for host replies to the IMM in IM Service mode decimal number from 0 250 TermFromHost 254 is carriage return line feed Win and 255 is no termination character 251 252 and 253 are reserved A serial break condition cannot be used for termination from the host Note TermFromHost does not apply in Host Service mode In Host Service mode the termination sequence is always r n Note that termination characters from the host are included in IM replies SetTermFromHost is allowed from the host the IM and as a group command Default is 254 for Interface modes 1 3 8 and 10 14 default is 62 decimal for Interface modes 2 and 9 SetTermToHost x x Termination character for transmissions from the IMM to the host decimal number from 0 250 TermToHost 253 is a serial line b
93. no GetEC yes yes no GetHD yes yes no GetHostFlag yes yes no GetHostID yes yes no GetLineStatus yes no no GetReply no yes no Same as Data GetSD yes yes no HostFileAppendLine yes yes yes HostFileErase yes yes no Confirmation required HostFileGetData yes yes no HostFileGetSummary yes yes no HostFileWrite yes no no ID op med yes no Global IM command Line only MeasureLineSignal yes no no Section 12 IMM Commands Command Allowed Allowed Allowed Comments from Host from IM as Group Global IM command to tell all IMMs PwrOff yes yes yes to go to sleep Note This differs from SendPwrOff ReleaseLine yes no no ResetEC yes yes yes ResetEventCounters yes yes yes Same as ResetEC SampleAdd yes no no SampleAddLine yes yes yes Sample Append yes no no Sample AppendLine yes yes yes SampleErase yes yes no SampleEraseAll yes yes yes SampleEraseMultiple yes yes no SampleGetData yes yes no SampleGetLast yes yes no SampleGetList yes yes no SampleGetSummary yes yes no SendBreak no yes yes Use this command when transmitting from SendExclusive yes no no an IMM Use EXCLUSIVE when transmitting from a SIM to an IMM Use this command when transmitting from SendGData Captured s ee an IMM to send the global GDATA Line only command to the IM line When using a SIM use GDATA instead Captured Tells remote devices to go to sleep without
94. on characters Note that setting EnableStripHostEcho 1 will cause loss of 1 or more bytes of the host reply if the host does not echo the command Use SetEnableStripHostEcho to enable disable the strip host echo function Note The IMM s echo must be disabled if the host echoes characters Use SetEnableEcho 0 to disable the IMM s echo 8 5 2 Termination of Host Reply Host replies to commands may be terminated with a single termination character a carriage return followed immediately by a line feed CRLF a low high transition on the HostFlag input or an inter character delay timeout Serial line breaks cannot terminate host replies The IMM has separate settings for the termination sent to the host and the termination received from the host see SetTermToHost and SetTermFromHost TermFromHost applies to replies sent by the host to commands received from the IMM If no termination is selected the THost4 inter character delay timeout should be shortened to act as a terminator In CRLF termination CR or LF may be sent to the device individually only the CRLF combination acts as termination Break condition termination is allowed only in the termination to the host not from the host 2 Terminating commands to the host with IMFlag would cause problems for devices using IMFlag to control their power supplies Section 8 IMM Host Interface in IM Service Mode The TermFromHost setting applies only in IM Service mode when the
95. or this causes the remote device with ID 00 to send the string GDATA to its host True binary support is provided with the HostFileWrite command which is accepted only from the serial port not from the inductive modem The HostFileAppend command is accessible from both the serial port and the inductive modem but the Host to IMM termination sequence r n may make storage of binary data with this command difficult The Host Data File checksum is implemented in firmware V1 05 and later The checksum will read as 0x00000000 for firmware versions prior to 1 05 7 Sample Data is implemented in EEPROM that has a nominal endurance of 1 million erase write cycles The Sample ID allows a rough estimate of the number of cycles the EEPROM had accumulated If an instrument records 6 samples per hour each of which uses the entire memory space of the EEPROM manufacturer s data suggest 99 9 of EEPROMs will last more than 20 years Sample Data checksums are implemented in firmware V1 05 and later Checksums will read as 0x00000000 for firmware versions prior to 1 05 Section 2 IMM Conceptual Model 2 2 8 IM Reply Buffer The IMM has an 8K buffer for replies from the host to the Inductive Modem Bytes are placed in the buffer as they are received from the host and they are removed from the buffer as they are transmitted to the IM line If the number of bytes in the buffer exceeds 8192 data is lost and a DPSK_BUF_OFLOW event is logged in the
96. or other activity When the IMM identifies an IM carrier on the line i e another device has captured the line or sent a legacy wake up tone the IMM enters IM Receive mode 7 2 Receiving Non Host Commands Commands addressing the IMM itself start with an except for certain global non host commands These non host commands are executed without disturbing the host When an IMM processes an incoming or non host global command it cannot respond to requests from the host 7 2 1 Receiving Group and Global Non Host Commands Group commands and most non host global commands do not allow a response The ID and ID commands are exceptions but these commands may only be used when a single receiving device is coupled to the IM line Note that any command can be made global by addressing it to group 0 as in GO Command Group commands starting with are executed in the receiving IMM s in the same way as individually addressed commands but replies to these commands are disabled 7 3 Detecting Wake Up Tones The IMM does not require wake up tones The IMM supports wake up tone detection for compatibility with some older UIM devices that sent a wake up tone to prompt a SIM to start data upload The recommended alternative for new designs is to send a command from one IMM to the other to initiate a data upload rather than sending a wake up tone A false wake up tone event may be caused by electrical noise or radar signals but a false incomin
97. ost Interface in Host Service Mode 5 5 1 TModem2 Maximum Wait for Start of IM Reply After transmitting an IM command to which a reply is expected the IMM waits for the first byte of the reply until a timeout occurs This timeout and the setting to control the timeout period are called TModem2 Valid values for TModem2 are from 5 to 3000 units are tens of milliseconds TModem2 100 means 1 second Note If the remote device is an IMM the remote IMM initiates its reply before attempting to wake up the remote host TModem2 is analogous to THost2 on the IM receiver 5 5 2 TModem3 Maximum IM Receive Time After transmitting a command and receiving a start of reply indicator the IMM listens to the reply until the reply terminates or a timeout occurs This timeout and the setting to control the time period are called TModem3 TModem3 is analogous to THost3 on the IM receiver Set TModem3 of the IMM transmitting the command to match or be slightly greater than THost3 of the IMM receiving the command If the receiver s THost3 is much greater than the transmitter s TModem3 the transmitter might start to send a new command while the receiver is still replying to the first command Valid values for TModem3 are from 100 to 60000 units are tens of milliseconds TModem3 100 means 1 second This allows IM receive time to range from second to 600 seconds ten minutes In Config Type 1 TModem3 has the same meaning but different units The units of
98. p until the input voltage rises above 6 0V If the voltage applied to the IMM rises above 19V a voltage limiting circuit activates This circuit allows the IMM to operate with reduced efficiency at input voltages up to 30V Systems with higher voltage power supplies should use the IMM Daughter board which has a high efficiency switching supply for 12V to 80V inputs The IMM has two internal high efficiency switching power supplies one powers the low voltage microcontroller and the other provides a higher voltage for the DPSK transmitter The transmitter power supply is bypassed and does not activate until the input voltage is greater than 9V which is the maximum safe transmitting voltage The IMM can measure the voltage of the transmitter power supply this measurement nearly matches the input voltage when the input voltage is less than 9V 2 1 6 HostFlag Digital Input HostFlag is a digital input used to power on the IMM or terminate commands or replies to commands 2 1 7 IMFlag Digital Output IMFlag is an open collector digital output used to signal arrival of data or completion of an operation 2 2 Nonvolatile Structures 2 2 1 Hardware Data Hardware Data contains data describing the IMM and can be modified only by the factory A standard command GetHD allows read only access to Hardware Data Hardware data includes Serial Number Manufacturer Hardware Manufacture Date Hardware Version Firmware Version and Firmware Date Each
99. pt e Termination character e Termination character e Automatic to GND from Host TermToHost TermFromHost e IMFlag release e Serial byte or break e Serial line break e HostFlag low high transition wr e HostFlag e Inter character delay e Inter character delay THost4 e Serial break low high 50mS e Maximum wait for start of reply transition THost2 e Maximum e Maximum IM reply wait for transmission time THost3 confirm THost0 8 1 Waking Host with IMM In most applications the host is asleep until a command arrives The IMM uses one of the methods described below to wake up the host before sending the incoming command 8 1 1 Waking Host with Hardware Handshaking IMFlag Hardware handshaking allows the host to remain in a very low power state while waiting for incoming commands on the DPSK line relying on the open collector IMFlag signal to initiate its wakeup In some applications it may be possible to control the host power supply directly with the IMFlag signal More often the IMFlag signal initiates the host power up and the host controls its own power down sequence If EnableAutoIMFlag 1 the IMM automatically uses IMFlag to signal the host to wake up The IMFlag signal is pulled to ground when the host should wake up The IMM releases the IMFlag line after an adjustable delay THost5 described below when the data transfer process is completed Use SetEnableAutoIMFlag to enable disable all automa
100. r group Individual devices cannot belong to more than two groups group 0 plus one additional group SetGroupNumber is allowed from the host the IM and as a group command Factory default is Group 0 Group membership is not affected by a change in Interface mode Section 12 IMM Commands SetHostID x x Host ID string 4 64 characters SetHostID is allowed from the host the IM and as a group command Default is Host ID not set for all Interface modes SetHostPrompt x x Prompt string expected from the host to confirm wake up 1 7 characters Host prompts are not case sensitive For example if the hostprompt is set to s gt and the instrument sends S gt the prompt is accepted SetHostPrompt is allowed from the host the IM and as a group command Default is S gt for Interface modes 1 through 6 and 8 through 13 default is x for Interface modes 7 and 14 SetID x Same as SetDeviceID SetIMFlag x x 1 Deactivate the pulldown on the IMFlag output line x 0 Activate the pulldown on the IMFlag output line SetIMFlag is allowed from the host the IM and as a group command NOTE this is not a setting in Configuration Data this changes the state of the physical IO line If ENABLEAUTOIMFLAG 1 the IMFlag signal will be released a few milliseconds after parsing the command SetInterfaceMode x Note This command changes many parameters in Configuration Data Check the desired Interface mode carefully before sen
101. r program that parses IMM output should be capable of ignoring comment tags and should have no dependency on the existence or content of comment tags 4 7 lt HostService2MinTimeout gt Reply Tag If the IMM is in Host Service mode and the host does not enter a valid command to the IMM for 2 minutes the IMM times out and goes back to sleep The IMM sends the HostService2MinTimeout tag to indicate it has timed out After sending the tag but before the IMM goes to sleep the IMM pauses for 250 milliseconds During this pause the IMM will not respond to any input from the host After the pause the IMM clears its serial buffers and goes to sleep immediately Note that this reply tag is sent automatically by the IMM upon timeout while all other reply tags are sent in response to a command The 2 minute timeout can be prevented by setting EnableHostFlagWakeup 1 and holding the HostFlag signal in a logic high state 14 The 250 mS pause guarantees that the IMM will not immediately wake up if the Host echoes the timeout tag Section 4 Reply Tags and XML like Formatting 4 8 Data Reply Tags Data reply tags are returned in response to particular commands and are closely linked to the IMM conceptual model and to Sea Bird s evolving standard instrument model Data reply tags for each command are described in detail with the command in Section 11 IMM Commands Examples of Data Reply Tags lt EventSummary numEvents UINT16 gt lt Sampl
102. re THost2 is set to 0 7 The process of waking the host sending the incoming data and relaying a reply is described in the next section 7 4 2 Group Addressed and Global Host Commands Group and Global host commands never allow an IM reply The host may send a reply to its IMM but the IMM will not transmit the data to the IM line Some Group and Global commands cause the IMM to store the host reply in Sample Data or the GData Reply Buffer Refer to the detailed command descriptions for these commands Note that any command can be made global by addressing it to group 0 as in AGO Command This works only if Command is understood by all host devices coupled to the IM line Group commands starting with are executed in the receiving IMM s in the same way as individually addressed commands but replies to these commands are disabled 7 5 Disabling Signal Detector Entering IM Receive mode may be disabled with SetEnableSignalDetector 0 This prevents the IMM from detecting incoming signals or noise on the IM line and is appropriate for applications where all IM communication initiates from a single device as in most buoy controllers Disabling the Signal Detector prevents detection of wake up tones Note The Signal Detector cannot be disabled if EnableSerialIMMWakeup 0 otherwise there would be a state from which the IMM would never wake up Setting THost2 to 0 is a method of disabling host replies See the detailed description for THos
103. reak 254 is carriage return line feed Win and 255 is no termination character 251 and 252 are reserved SetTermToHost is allowed from the host the IM and as a group command Default is 13 for Interface modes 1 through 6 and 8 through 13 default is 254 for Interface modes 7 and 14 SetTHost0 x x THost0 maximum wait for wake up confirmation 0 1000 units are tens of milliseconds THost0 100 means 1 second Described in detail in Section 8 6 T imeout Parameters SetTHost0 is allowed from the host the IM and as a group command Default is O for all Interface modes Section 12 IMM Commands SetTHostl x x THostl delay after confirm 0 300 units are tens of milliseconds THost1 100 means 1 second Described in detail in Section 8 6 Timeout Parameters in IM Service Mode SetTHostl is allowed from the host the IM and as a group command Default is 5 for all Interface modes SetTHost2 x x THost2 maximum wait for start of reply 0 or 100 3000 units are tens of milliseconds THost2 100 means 1 second Described in detail in Section 8 6 Timeout Parameters in IM Service Mode SetTHost2 is allowed from the host the IM and as a group command Default is 3000 for Interface modes 1 3 5 8 10 and 12 default is 1000 for Interface modes 2 4 6 7 9 11 13 and 14 SetTHost3 x x THost3 IM reply transmission time 100 18000 units are tens of milliseconds THost3 100 means 1 second Described in detail in S
104. rmware revision history 61 G GData Reply Buffer 10 Group commands 37 H Hardware 8 Hardware Data 9 Host 8 Host Command Buffer 11 Host Data File 10 Host Service mode 12 18 I IM Command Buffer 11 IM Receive mode 12 IM Reply Buffer 10 IM Service mode 12 25 Inductive Cable Coupler 8 Interface modes 33 L Limited liability statement 2 Line capturing 21 Logic level serial modes 33 M Mode 10 12 Model 6 8 Modes interface 33 logic level serial 33 RS 232 33 N Nonvolatile structures 9 O Operating mode 10 12 Overview 6 Overwriting samples 32 P Pinouts 58 Power consumption 60 Section 16 Index Power cycling 12 Power input 8 Power supply 59 Prompts 19 R Reading samples 32 Releasing IM line 21 Remote devices receiving commands from 23 sending commands to 21 Reply tags 14 Resistance 59 Retrieving list of samples 31 Revision history firmware 61 specification 62 RS 232 modes 33 S Sample data 31 Sample Data 10 Samples adding 31 appending 31 erasing 32 overwriting 32 reading 32 retrieving list of 31 Sending commands 36 Sending data 21 Signal detector disabling 24 Signal Detector 8 Sleep mode 12 Specification electrical 58 Specification revision history 62 Status Data 9 T Tags 14 THostO 28 THostl 28 THost2 29 THost3 29 THost4
105. rror is generated upon termination of the command 5 2 1 Terminating Commands to IMM Commands may be terminated with the termination sequence or a low high transition of the HostFlag signal The termination sequence for commands from the host to the IMM is carriage return CR 0x0D or r followed by line feed LF Ox0A or n the termination sequence cannot be disabled HostFlag termination may be enabled disabled with SetEnableHostFlagTerm Note that the TermFromHost setting does not apply in Host Service mode it applies only in IM Service when the host responds to data from the IMM 5 3 IMM Prompts and Echoing The IMM can send prompts and echo characters to the host These features are important when using a terminal program to communicate with the IMM The prompt may also serve as confirmation to the host that the IMM is awake and serving the host Use SetEnablePrompt 1 to enable prompts use SetEnableEcho 1 to enable echoing Note that the prompt applies only to Host Service mode the prompt is never sent to the host in IM Service mode 5 4 Backspace For convenience the IMM can respond to the backspace character when a user sends commands with a terminal program Use SetEnableBackspace 0 to disable the backspace action when transmitting binary data 5 5 Timeout Parameters in Host Service Mode The IMM has three timeout settings in addition to the 2 minute timeout that apply only in Host Service mode Section 5 IMM H
106. s not respond to commands or wake up attempts from the host nor does it respond to additional commands arriving from the IM line The IMM does not send lt Busy gt replies to the IM line in IM Service mode 3 3 IM Receive The IMM enters IM Receive mode if the signal detector is enabled and a signal is detected on the IM line A wake up tone is not required to switch an IMM into IM Receive mode Note a wake up tone is required for SBE 37 16 and 44 to enter the analogous mode Every 2 minutes the IMM tests the line for a valid signal If there is no signal the IMM returns to Sleep mode Arrival of a valid IM command resets the 2 minute timer If the PwrOff command arrives from the IM line the IMM pauses for 100 milliseconds then switches to Sleep mode In IM Receive mode the IMM responds to wake up attempts from the host by switching directly to Host Service mode At the end of Host Service mode the IMM re tests the IM line If a valid signal is present the IMM resets the 2 minute timer and resumes IM Service Note The same timer is used for IM Service and Host Service it is reset on every mode change 3 4 Sleep Sleep mode is the IMM s low power on state If the signal detector is enabled and a signal is identified on the IM line the IMM switches to an intermediate mode for a few milliseconds to determine if the signal is a valid IM signal If the signal is valid the IMM switches to IM Receive mode otherwise it returns to Sleep
107. s an adjustable delay between the IMM receiving confirmation that the host is awake or the THost0 timeout expiring and the IMM sending data to the host The delay does not apply to host initiated communication This delay is useful for slow instruments THostl can be set to 0 in most applications Valid values for THostl are from 0 to 1000 units are tens of milliseconds THost1 100 means 1 second 8 6 3 THost2 Maximum Wait for Start of Reply After the IMM sends an incoming IM command to a host it waits for a reply from the host Some hosts may respond immediately others may take seconds or longer to reply THost2 is the maximum time the IMM waits for the first byte of reply from the host before assuming there is no reply If the THost2 period passes with no reply bytes received from the host the IMM responds to the IM line with an Error and logs a THost2 event in the Event Counters Valid values for THost2 are from 100 to 3000 or 0 units are tens of milliseconds THost2 100 means 1 second In the special case of THost2 0 the IMM assumes its host will never send a reply All incoming commands receive an automated empty reply after the host wakeup wake up confirmation and transmission of the incoming command to the host is completed No Error is reported or logged in this case Setting THost2 0 is useful for simple unidirectional communication 8 6 4 THost3 Maximum IM Reply Transmission Time This is the maximum allowed duration of an IM r
108. st Service mode when power is turned on or when the IMM resets for any other reason x 0 Disable this feature SetEnableHostServeOnPwrUp is allowed from the host the IM and as a group command Default is O for Interface modes 1 2 5 6 8 9 12 and 13 default is 1 for Interface modes 3 4 7 10 11 and 14 SetEnablePrompt x x 1 IMM sends the ModemPrompt to the host when it powers up when it wakes up in response to HostFlag or Host Serial transitions after processing each host command except for the PwrOff command and after confirming host wake up when relaying IM commands x 0 Disable this prompt SetEnablePrompt is allowed from the host the IM and as a group command Default is 0 for Interface modes through 6 and 8 through 13 default is 1 for Interface modes 7 and 14 SetEnableHostWakeupCR x x 1 IMM sends a character to the host to wake up the host when a command is received from the IM line The IMM sends a r to the host to generate the wakeup This feature is independent of IMFlag setttings x 0 Disable this feature SetEnableHostWakeupCR is allowed from the host the IM and as a group command Default is 0 for Interface modes through 5 and 8 through 12 default is 1 for Interface modes 6 7 13 and 14 SetEnableHostWakeupBreak x x 1 IMM sends a serial break condition to the host to wake up the host when a command is received from the IM line The SerialBreakLen setting controls the duration of t
109. t2 in Section 8 IMM Host Interface in IM Service Mode Section 8 IMM Host Interface in IM Service Mode 8 IMM Host Interface in IM Service Mode In IM Service mode the IMM will either respond to local command e g ii GO or initiate communications with the Host The IMM responds to local commands without disturbing the Host The IMM initiates communications with the host only in three situations The first and most common situation is when a command wih matching device ID arrives from the IM line as would occur if the remote device that captured the IM line received a ii command The second situation is when a global command or matching group command arrives on the IM line as would occur if the device that captured the line received SENDGDATA a global command or a G0 group command The third and least common situation is when EnableToneDetect 1 and a wake up tone is detected as would occur if the device that captured the line received the SENDWAKEUPTONE command In IM Service mode the IMM Host interface has seven stages the IMM wakes the host the host confirms wake up the IMM sends the command to the host the IMM terminates the command the host sends a reply to the IMM the host terminates the reply and then the host returns to sleep Table 8 1 Summary of IMM Host Interface Options in IM Service Mode Host Confirm Command Reply Termination Host Return Wake up Wake up Termination To Sleep e IMFlag pulled e Prom
110. the delay between completion of a command and the arrival of the next valid command is not longer than 2 minutes 5 1 Entering Host Service Mode There are three ways to enter Host Service mode Each method can be independently disabled Some applications require all three methods be disabled preventing the IMM from ever entering Host Service mode The host may initiate Host Service mode at any time except when the IMM is in IM Service mode or during a blackout period after a PwrOff command power cycle or 2 minute timeout When the IMM enters Host Service mode it notifies the host with a prompt and the IMFlag signal Any characters received after the IMM confirms wakeup are added to the command buffer so the host should initialize its serial port before initiating Host Service mode If spurious characters are sent during wakeup the host may need to send the termination sequence win to clear the command buffer before sending the first command Table 5 1 Summary of Host Service Mode Interfacing IMM Confirm Command Termination Reply IMM Return Wake up Wake up Termination To Sleep e Power up e IMFlag e Termination character e Termination e Power down e Serial byte or pulled to sequence CR followed character e PwrOff command break GND by LF nn e Serial line break e 2 minute timeout e HostFlag high e IMM prompt e HostFlag low high e Inter character Note IMM will not sleep if low transition transition delay Hostflag
111. tic switching of the IMFlag output Disabling IMFlag applies to all operating modes 22 This delay would be measured by the host The IMM sends the incoming data to the host in one burst with minimal separation between bytes 2 This is the inter character delay specified by the Configuration Data setting THost4 The host may go back to sleep immediately after terminating its reply to the incoming command Section 8 IMM Host Interface in IM Service Mode 8 1 2 Waking Host with a Serial Byte If EnableHostWakeupCR 1 the IMM sends a r character carriage return to the host to generate a wake up when initiating communication If EnableHostWakeupBreak 1 the break condition is sent before the r character Use SetEnableHostWakeupCR to enable disable the host wake up carriage return feature 8 1 3 Waking Host with a Serial Break Condition If EnableHostW akeupBreak 1 the IMM sends a serial break condition to the host The SerialBreakLen setting controls the duration of the break If EnableHostWakeupCR 1 the break condition is sent before the r character Use SetEnableHostWakeupBreak to enable disable the host wake up break feature 8 2 Confirming Host Wake up The IMM waits for confirmation that the host is awake before transmitting the command to the host The THost0 setting provides an adjustable timeout for the confirmation process If THost0 is set to 0 the host wake up confirmation stage is disabled and the
112. tify the host Section 2 IMM Conceptual Model 2 2 3 Status Data Status Data describing the IMM contains data that change while deployed Status Data is not always directly modifiable but in general the ability to clear or reset elements of Status Data is provided A standard command GetSD allows read access for the host or through the IM line Multiple commands may affect Status Data refer to the command summaries for specific details Status data includes Power Level Event Counters Discovered by List Host Data Summary and Sample Data Summary 2 2 4 Event Counters Event Counters are an array of counters recording the number of occurrences of common timeouts power on resets watchdog timer resets and other conditions Event Counters are analogous to the Black Box in airplanes they help identify the root cause of a malfunction 2 2 5 Host Data File The Host Data File is a nonvolatile memory buffer physically located on the IMM reserved for storage of host specific information This buffer may be used to store anything including binary data Some users may store host setup information an XML file describing the host or JAVA scripts for processing data from the host The buffer is limited to 4 Kbytes and is read and write accessible from both the serial port and the inductive modem A Host Data summary is available with file length and checksum 2 2 6 Sample Data The Sample Data structure is a nonvolatile memory
113. tion Mating connectors 10 pin header Hirose DF11 10DS 2C Digikey H2023 ND 4 pin header Hirose DF11 4DS 2C Digikey H2019 ND Crimp contacts 24 to 28 AWG Hirose DF11 2428SCA DigiKey H1505 ND Crimp tool Hirose DF11 TA2428HC US Digikey H9924 ND Pre crimped wires DigiKey H3BBG 10112 B4 ND Connector Option 3 Male right angle for cable connection Mating connectors same as Connector Option 2 Table 13 1 J1 Pinout RS 232 Logic Level Serial Pin Signal Direction Description 1 IM Coil Positive side of IM coil connect to center if using coax 2 IM Coil Negative side of IM coil connect to shield if using coax 3 HostFlag In Hardware Handshake signal 1 5V to 12V input with internal 4 7K series resistor 100K pulldown resistor 10nF load and 12Volt TVS Hardware Handshake signal Pulldown only 100ohm series resistor and 330pF load j IMERE Out Static protected with 12V TVS 5 LLS_Rx In Logic Level Serial receive data input 6 RS 232Rx In RS 232 Serial receive data input Logic Level Serial transmit data output Open collector with 100 ohm series resistor l Mori Out and 12Volt TVS 8 RS 232_Tx Out RS 232 Serial transmit output 9 Vin Positive Power Input 10 Vin GND Power Supply Return Ground Table 13 2 J1 Pinout RS 485 Pin Signal Direction Description 1 IM Coil Positive side of IM coil connect to center if using coax 2 IM Coil Negative side of IM coil connect to shield if using coax Hardware
114. urns FAILED Error and POWER FAIL Error if the transmit voltage is low Returns FAILED Error if the coupler connection is poor or the coupler is not connected Returns lt CableCouplerTest status GOOD MEDIUM BAD Z UINT16 gt if the test is performed Example IMM gt testcablecoupler lt CableCouplerTest status GOOD Z 1485 gt lt Executed gt Example IMM gt testcablecoupler lt Error type NOT ALLOWED msg IM Line Not Captured gt lt Executed gt Example IMM gt testcablecoupler lt Error type FAILED msg Low Transmit Voltage low battery or bad coupler gt lt Error type POWER FAIL msg Transmit Voltage Vtx 0 0 gt IMM gt Example 00TestCAbleCoupler Ror lt RemoteReply gt lt Executing gt Dy HAYyAyO Y 7 Y ay lt CableCouplerTest status GOOD Z 2405 gt lt Executed gt lt RemoteReply gt lt Executed gt TestEEPROM Tests the internal EEPROM for errors Section 12 IMM Commands Allowed from Host Yes IM Yes Group No Format testeeprom 00testeeprom Requires Nothing Modifies Nothing Effects Tests the internal EEPROM for errors Returns lt Executing gt about once per second Returns One or more EEPROM FAILURE Errors if the test does not pass Returns when lt Executed gt completed TXTest Sends a series of tests of IM communications Allowed from Host No IM Yes Group No Format
115. with ID 00 and OGETSD returns an error SetEnableA utoIMFlag x x 1 IMM automatically controls the IMFlag digital output to wake up the host confirm the IMM wakeup and terminate commands and replies x 0 Disable this feature When set to 0 the only way to change the state of IMFlag is with the SetIMFlag command SetEnableAutoIMFlag is allowed from the host the IM and as a group command Default is 1 for all Interface modes a Support for 38400 baud was removed in firmware V1 05 Section 12 IMM Commands SetEnableBackSpace x x 1 Interpret the backspace character as a command to delete the previously received character when received from the host This feature applies only to host commands not to host replies to IM commands This feature is extremely useful when the host is a terminal program on a PC x 0 Treat the backspace character as a normal character with no deletion SetEnableBackSpace is allowed from the host the IM and as a group command Default is 0 for Interface modes through 6 and 8 through 13 default is 1 for Interface modes 7 and 14 SetEnableBinaryData x x 1 Enable the IMM specific translation of data to the IM line x 0 Disable IMM specific translation Use this setting when using the IMM with older devices that do not support translation such as the SBE 44 UIM and SIM Older devices will not properly receive lt gt n E and if binary data is enabled on the transmitting IMM SetEnable
116. y gt lt Executed gt GetSD Get Status Data Allowed from Host Yes IM Yes Group No Format getsd 00getsd Modifies Nothing Requires Nothing Effects Returns data Returns IMM gt 01 getsd lt RemoteReply gt lt Executing gt lt StatusData DeviceType SBE90554 IMM SerialNumber 70000047 gt lt HostID gt Host ID not set lt HostID gt lt EventSummary numEvents 208 gt lt Power gt lt TransmitV oltage gt 7 6 lt TransmitV oltage gt lt Power gt lt SampleDataSummary NumSamples 0 TotalLen 0 FreeMem 16384 gt lt HostFileSummary Len 0 CRC 0x00000000 gt lt DiscoveredBy SN 0 gt lt LineStatus gt CAPTURED lt LineStatus gt lt StatusData gt lt Executed gt lt RemoteReply gt lt Executed gt Definition of the lines e SerialNumber IMM serial number gt 100 and lt 2 programmed at factory e HostID User programmable 4 64 character string e EventSummary Record of number of times events such as power loss watchdog timer restarts invalid commands serial errors timeouts firmware failures etc have occurred The generic data contains a vector of pre defined integer error codes and the number of occurrences for each type e Power Battery voltage or other indication of the state of the device power supply This may not be relevant when the IMM is powered through the host e SampleDataSummary Number of samples in memory total amount of data in memory and availabl
117. y setting THost0 0 After the THost1 delay the IMM sends the command to the host There is no significant inter character delay in transmission of data to the host Section 8 IMM Host Interface in IM Service Mode 8 4 Terminating Command to Host After sending the command to the host the IMM terminates the command There are several options for terminating commands Commands may be terminated with a single termination character a carriage return followed immediately by a line feed CRLF or a serial line break The IMFlag signal cannot terminate commands to the host The host may interpret an inter character delay greater than 50mS as termination Note that the IMM has separate settings for the termination sent to the host and the termination received from the host see SetTermToHost and SetTermFromHost TermToHost applies to termination of the command sent by the IMM to the host Each setting is recorded in a single byte termination code The IMM interprets any value less than 250 as a single byte termination character The IMM interprets 253 as a serial line break applicable for SetTermToHost only 254 as CRLF and 255 as no termination If no termination is selected the inter character delay timeout should be shortened to act as a terminator In CRLF termination CR or LF may be sent to the device individually only the CRLF combination acts as termination 8 5 Host Replies The host may begin its reply immediately after the I
118. y simple rule allows specification of transmission times for binary data e The following binary values transmit as single characters All values gt 0x20 TAB 0x09 LF Ox0A CR 0x0D e All other binary values transmit as two characters and are automatically decoded when received The only observable effect for characters lt 0x20 is an increase in transmission time There is no observable effect for TAB 0x09 LF Ox0A CR 0x0D and characters gt 0x20 It is the user s responsibility to prevent early termination of their commands from the host to the IMM with the r n termination sequence and in replies from the host to the IMM if termination characters are used Termination characters less than 0x20 are allowed Termination characters gt OxFA 250 decimal are NOT allowed 2 The backspace character 0x08 is interpreted as a command to delete the previously sent character if EnableBackspace 1 Use the SetEnableBackspace 0 command to disable the backspace character for binary data transfers Section 10 Using Sample Data 10 Using Sample Data The Sample Data structure is a nonvolatile memory space for data buffering between the host and a remote device connected to the inductive mooring In buoy applications data buffering allows host instruments to take measurements and report data independently of the update rate of the buoy controller The IMM buffers data from the host instrument in the Sample Data structure betw

Inductive Modem Module (IMM) User`s Manual

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