ECQUE Shaft Encoder with ECN interface
Contents
1. Use set on repetitively to review the list of parameters and their respective values 4 6 Setting the cl SPAN 4 20 only As explained in APPENDIX B the parameter cl SPAN cl stands for current loop must be set equal to the maximum anticipated range in the water level that is the cl Zero cl SPAN equals the level for which the ECQUE D will output 20 mA Begin by accepting the password as described above Use select until the word cl SPAN appears Press the set On switch Use the Edit switch to set the display equal to the proper value as described in APPENDIX B then use set On to enter this value NOTE that when entering values for the el SPAN the decimal point must be present as these parameters are floating point variables The or sign must also be entered for these parameters For instance a scale of 14 1 000 may be entered as 1 but not as 1 1 or 1 Use set on repetitively to review the list of parameters and their respective values 4 7 Setting the Checksum Mode As explained in section 3 3 3 Checksum Verification Mode the ECQUE can be configured to either verify or ignore the checksums of incoming messages from the host This configuration can be accomplished from the display as follows Begin by accepting the password as described above Use select until the word Ev scale appears Press the set On switch Use the Edit switch to set the dis2. lt cksum gt 4 Set the CL SPAN 4 20 option only e command aS8 lt CL SPAN gt lt cr gt lt cksum gt e response a lt cr gt lt cksum gt 5 Checksum Verification Mode e command aS2 lt Checksum Verification Mode gt lt cr gt lt cksum gt e response a lt cr gt lt cksum gt ECN Network Commands 1 Change Node Address Command A e command aAb lt cr gt lt cksum gt where b new node address e response b lt cr gt lt cksum gt Send ECN Identification String I e command al lt cr gt lt cksum gt e response a lt identification string gt lt cr gt lt cksum gt Send acknowledgment e command a lt cr gt lt cksum gt Sg response a lt cr gt lt cksum gt 22 APPENDIX B Determining CL ZERO and CL SPAN 4 20 option In order for the ECQUE to properly convert the data to a 4 20 mA output option 4 20 only it is necessary to define the values CL ZERO see 3 3 4 and 4 5 and CL SPAN see 3 3 5 and 4 6 The parameter CL ZERO must be set equal to the minimum anticipated value in the water level The parameter CL SPAN must be set equal to the maximum anticipated range in this data Example Assume the lowest possible water level is 130 000 and that the highest is 140 000 You must enter a value of 130 000 for the CL ZERO and 10 000 for the CL SPAN using the display and switches D option only or proper ECN command Therefore a value of 132 5
3. Principle of Operation The ECQUE is provided with an on board 8988252 microcontroller and firmware which follows the shaft rotation each transition of either of the quadrature inputs adds or subtracts a count to a 16 bit stored value representing the position of the shaft and therefore the fluid level A set up parameter called Scale is provided to allow the application of a standard circumference pulley and tape so that the accumulated count represents an accurate fluid level If using a 1 ft circumference pulley for instance the accumulated count would directly indicate a fluid level in feet by setting the scale 1 0 The ECN output from the microprocessor is the ASCII code representation calculated to three decimal places and is equal to the position value stored in the internal register divided by 384 Model K encoder Communication with an external controller or computer is according to the ECN protocol The output will be a decimal value in the range 999 999 units The encoder s Scale and H2O Level are set using ECN commands As mentioned the value of Scale must be equal to the circumference of the wheel whereas H20 Level is set equal to the initial fluid level For instance if you want the ECQUE to track the stage in meters above sea level you would measure your stage at set up time and enter it in metres above sea level If you measure it as being 101 225 you would simply enter 101 225 as your H20 Level and the unit would now track your s
4. entering the four character password the following characters are valid 0 1 2 3 4 5 6 7 8 9 lt space gt The password can only be viewed or altered from the display and must be entered correctly to view the 13 remaining setup parameters To set the password equal to the characters displayed on the screen press the set switch otherwise press Select Note that the correct password that was entered to gain entry to the setup parameters can be viewed as long as the display has not switched off with the auto power off feature see below If the display does shut off however and is turned back on PASSWORD will display the default value namely 000 which must be edited once again to obtain access Never forget your password otherwise you will not be able to change the setup parameters from the display at a later date In the event that it is forgotten contact AMASS Data Technologies Inc at amassinf amassdata com 4 3 Setting the Fluid Level Begin by accepting the password as described above Use select until the word H20 Level appears Press the set On switch Use the Edit switch to set the display to the current fluid level see 3 3 1 then use set On to enter this value NOTE that when entering values for the H2O Level and Scale the decimal point must be entered as these parameters are floating point variables The or sign must also be entered for these parameters For instance a Sca
5. models in the event of power supply interruption There are no mechanical contacts involved in the measurement process the only contacting moving parts are the precision shaft bearings The starting torque is low 0 65 inch oz 47 cm g or less and the system is not sensitive to vibration It is housed in a painted aluminium case and may be installed in exposed locations It is tested to operate from 40C to 55C and up to 100 relative humidity 1 1 Options Here are the options of the ECQUE The 4 20 option The 4 20 option is a 4 20 mA module which provides a standard current loop as a means of relaying the acquired data to the host in applications requiring an analog interface The LP option LP stands for Low Power The LP version of the ECQUE utilizes a sampling technique that is adaptive to the speed of the shaft encoder This adaptive sampling technique reduces the current draw from about 30 mA down to about 5 mA quiescent The D option This option provides an 8 digit display and two operator switches that allow the user to view data as well as set parameters H20 Level Scale CL Offset CL Span The PMDM and PMDM V options Built in PMDM environmental modem See PMDM user manual The standard ECQUE uses an RS485 output for driving the ECN protocol Alternatively the PMDM option provides modem communications whereas the PMDMV V provides both modem and voice modem communications 1 2 Quadrature Encoder
6. optical incremental encoder 96 x 4 counts per revolution Resolution 384 counts per revolution software conversion to engineering units provided in firmware Units per revolution Range 32 0 m with 375 m circumference pulley 85 3 ft with 1 00 ft circumference pulley Max Response Speed 2 5 rev sec Output ASCII accumulated level using e Slave ECN protocol driver Response Messages transmitted upon request via RS485 standard or modem PMDM option OR e 4 20 mA current loop for host interface 4 20 option Physical Characteristics Height 165 0 mm 6 5 in Width 114 0 mm 4 5 in Depth 70 0 mm 2 75 in Weight 1 35 Kg 3 0 Ib Mounting Mounting brackets use four 10 bolts or screws Connector 9 pin DB9 Connector Power Supply 10 5 to 15 VDC input for external battery charger or power supply Power Consumption Standard model 30 mA with display off 2500 samples sec Low Power model lt 5 mA quiescent current for a sample rate of once per second maximum current lt 30 mA with display off Battery Backup 9 V 565 mAHr alkaline battery backup Only if connector is mounted Mechanical Interface Threaded shaft 1 4 x 32 thread plus clamp assembly 303 stainless Maximum safe load 10 lb 4 5 kg Starting Torque inch oz 47 cm g max Environmental Characteristics Operating 40 to 55 C Storage 60 to 100C Humidity lt 100 non condensin
7. 0 JUMER CONFIGURATION EE 20 LEE EN UI LSC AR LE LE 21 APPENDIX A ECN COMMAND SET FOR ECQUE QUICK REFERENCE ccccsesesesesesesesceeeesesceees 22 APPENDIX B DETERMINING CL ZERO AND CL SPAN 4 20 OPTION cccsoscsscssoessscsosoeeees 23 APPENDIX C ECQUE ERROR MESSAGES ciscisssssssssesssssssssscsoscossssssessssssssesssssseeesssoscsessesssesssesssesssssseess 24 ECQUE Quadrature Shaft Encoder with ECN Protocol Interface Pliant Technology Specialists Pliant readily yielding to influence 1 ECQUE Shaft Encoder The ECQUE Incremental Shaft Encoder is an intelligent and reliable microprocessor based incremental shaft encoder which may be used with a pulley tape and float arrangement to measure stream stage or other fluid levels The ECQUE accumulates position data at 2500 times per second to ensure accurate tracking of the shaft A low power version see section 1 1 Options samples the shaft position adaptively as a function of its rotational speed The ECQUE provides its sensed data to the Data Collection Platform DCP ECHMI personal computer programmable controller or other host device by means of the AMASSER ECN Protocol see datasheet on the ECN Protocol or visit www amassdata com The standard ECQUE provides the ECN communications by means of an RS485 driver thus allowing support up to 4000 feet A built in modem option PMDM only allows communication over any distance covered by a telep
8. 00 would be generate 8mA in the current loop as such Sensor data CL ZERO X 16 CL SPAN 4 current output 132 500 130 000 X 16 10 000 4 8mA 23 APPENDIX C ECQUE ERROR MESSAGES The following error codes may be transmitted by the ECQUE Error Code Er Er3 Er4 Pr Meaning Invalid transmission length Incorrect checksum Tx buffer overflow Invalid command if checksum is correct otherwise Fr i is returned 24
9. Mote secsenecroreieiieiie n i a a a i i ge d 9 Bet Ot ERG ZERO A W ONN E 10 ZaD Sehe CL SPAN V O EE 10 SA ECN NETWORK COMMANDS s0cecacecscscsvescdussvecsevesecendeseeccudeseresed renen Kanis ri bsbwesetaeeversdbsesesasverabeseceedoaise 11 341 Return Ce AOR EEN ege ee EE ee EE ees ge Seeerei 11 SAD ARG bs Bete CUTAN DEE 11 34 5 Change PCM EE 12 A DISPLAY OPERATION D OPTION u cscsssscsscsceccsssccccccccccscssccccssscccesssscccesssssscssossesessssccsssssscsosorsens 13 Al JIDISPLAYING THE PLUTO E EE 13 42 ACCEPTING CHANGING THE PASSWORD s cccccsiccecscescudsensecockocdencnonsvsgsecsedessasesencsscecuinecseevenssseneeesesinvecesine 13 A SEUNG WHE PLUIM E EE 14 44 SEEING THE MP NCOBER SO been EE Aen 14 45 SETTING THE CL ZERO M 20 ONLY ocana E A E aE 14 AG SETTING THE CLSPAN A O ONLY E 14 4 7 SETTING THE CHECKSUM MODE ccccssssecccescscccneccenevscsceenaveccenscecsenavessaveccsssnavessenscsssenavescensseensessvenes 15 AS SETTING THE NODE ADDRESS oai erre EEEa E EEO EE ERE 15 Se 1 E EEN RL E 16 Dols MECHANICA EE 16 EN E E EE 17 La CONNECTORS EE 18 SC EE EE ECOUTE EE 18 5 3 2 ECOUEPMDM MOdels icccscsnscccsnsndeccsesnsencnteadecctosnsnedensninscsadaseacesceensasednsaacensadeacsesasanchcncebnsaasadascsess 18 Se NT EE 19 5 4 CONNECTION OF 4 20 MA CURRENT LOOP 4 20 ONLY cccsseccccesecesccneccececcseesseccseeecsseeuecsseeeeeeeeeens 19 5 5 CALIBRATION OF 4 20 CURRENT LOOP M 20 ONLY EE 20 5
10. Y Technologies Inc ECQUE Quadrature Shaft Encoder with ECN Protocol Interface including the Display option User Reference Manual Firmware Revision Updated January 17 2002 http www amassdata com Clockwise rotation of the pulley represents rising water levels when the scale is positive otherwise the scale must be set negative TABLE OF CONTENTS 1 BCOUE SHAFT ENCODER sassone ere ursos r nE EEE Kro EES ONDE ESSEE ES NESSE a Sore iNES 3 Pe OPO EE 4 1 2 QUADRATURE ENCODER PRINCIPLE OF OPERATION eeeeeeeeerererertreteseseterererererererererererereresreesessreseseree 4 Ze ECN PROTOCOL osoren EErEE NEKE EEEE EEEIEE NE EESE EEE S Er EE ESE aE EES 5 Be ECN COMMANDS ocisicsssccsscossscessvsncssecsoansscestvadsecoonssetecsssdocescnssnecsecsencceecsuascseeauacsestesuasesovenssesseouedsesanssesseoss 6 zk ECN ee ETC el EE 6 3 22 RETRIEVE DATA COMMANDS 0 scccosesscccvesaccsesoasevesnctaseseencuceserussserecedvinceosseadscesesedssesesscnberecsisecaperedessoassese 6 3 2 1 Send Shaft Position it Scaled Was eene EENS 6 3 2 2 Start verification command EEN 7 525 Read Valse of Setup ParaMmetet EE 7 Bios ECN SEP EE e 8 3 3 1 Seb Set eg HIZO Level E 8 3 3 2 Set encoder Scale units per PEVOIMUOMN lt 25 s22 ccsssnnncccodaseassonasdcaaedaedcaspanaddasrandaedeahscdassdnagoaseceadeeseseas 8 33 Aa Checkout VSTi Ail
11. anticipated water level is 10 000m and the maximum is 20 000m Therefore the CL SPAN must be set to 10 000 Note that the accuracy of the current loop is a function of the CL SPAN Given that the 4 20 module uses a 16 bit A D the resolution of a 10 meter SPAN is approximately 0 00015m The resolution of the shaft encoder is 0 00098m Assume the sensor address B Command BS8 10 000 lt cr gt lt cksum gt db Response B lt cr gt b0 10 3 4 ECN Network Commands 3 4 1 Return identification string e Command al lt cr gt lt cksum gt e Response a lt identification string gt lt cr gt lt cksum gt This command instructs the ECQUE to return its identification string Example The current ECQUE address is 0 and you wish to obtain its identification string Command Ol lt cr gt y Response 0 AMASSDATA ECQUE070 lt cr gt lt cksum gt Therefore the sensor is manufactured by AMASS Data Technologies and the firmware version is 070 3 4 2 Acknowledge active command e command a lt cr gt lt cksum gt e response a lt cr gt lt cksum gt This command allows the user to confirm that the current host address is active Example The current host address is 3 and you would like confirmation that it is active Command 3 lt cr gt 9e Response 3 lt cr gt bf This response is confirmation that host address 3 is active 11 3 4 3 Change ECN device node address e Command aA lt new address gt lt cr gt lt cksu
12. call that the value for the parameter scale represents the engineering units equal to one revolution of the shaft and is equal to the circumference of the pulley mounted on the shaft Therefore 0 375 might represent 0 375 meters per revolution Also recall that a positive value for scale represents a clockwise rotation of the shaft for rising water levels Refer to 3 3 2 3 3 ECN Set Commands 3 3 1 Set Encoder H2O Level e command aSO lt H20 Level gt lt cr gt lt cksum gt e response a lt cr gt lt cksum gt This command is for setting the initial fluid level The ECQUE uses a 16 bit value to represent the shaft position therefore the range of the sensor is 32 meters from the initial level with 384 counts per rev and assuming a Scale of 0 375m rev Example The current address of the ECQUE is 5 and you wish to set the encoder to measure the elevation of the water level above sea level You would measure your stage at set up time and enter the H2O Level accordingly For instance if the stage level were measured as 101 225 meters above sea level you would enter 101 225 You would then interpret all values returned by the ECQUE as meters above sea level Command 5S0 101 225 lt cr gt bb Response 5 lt cr gt ed 3 3 2 Set encoder scale units per revolution e Command aSl lt scale gt lt cr gt lt cksum gt e Response a lt cr gt lt cksum gt This command sets the encoder scale according to the size of pu
13. ent Command 3S2 0 lt cr gt df Response 3 lt cr gt c2 This response confirms that the checksum verification mode has been successfully set The checksums of messages from the host will henceforth be ignored by the ECQUE Therefore valid commands with incorrect checksums will be accepted and processed appropriately Note that the checksum verification mode is stored in the EEPROM and is thus non volatile NOTE The host must always send a checksum byte following the lt CR gt character regardless of the checksum verification mode Sections 3 3 4 3 3 5 are applicable to models with the 4 20 option 3 3 4 Set the CL ZERO 4 20 Only 1 Command aS7 lt CL ZERO gt lt cr gt lt cksum gt 2 Response a lt cr gt lt cksum gt This command is for setting the CL ZERO that is the water level for which 4mA will be generated in the current loop Naturally the CL ZERO is equivalent to the lowest anticipated water level Example The current sensor address is 2 and the lowest anticipated water level is 12 121 meters You would therefore set the CL ZERO to 12 121 as follows Command 2S7 12 121 lt cr gt e6 Response 2 lt cr gt cO 3 3 5 Set the CL SPAN 4 20 Onl 1 Command aS8 lt CL SPAN gt lt cr gt lt cksum gt 2 Response a lt cr gt lt cksum gt This command is to set the 4 20mA SPAN The CL SPAN must be set to the maximum anticipated range in the water level Example The lowest
14. for the execution of the command Following the body of the message is a carriage return byte OdH followed by a one byte checksum which is the one s complement of the sum of all the bytes in the message including the carriage return byte but not including the one byte checkum Example of checksum calculation Command 2I lt cr gt lt checksum gt ASCII 2 ASCII T ASCII lt cr gt 32H 49H ODH 88H Therefore lt checksum gt 77H ASCII w one s complement of 88H is 77H The proper command string is thus 2I lt cr gt w NOTE The second last character of the message is always CR ODH This CR character must never be used anywhere else in the message string and must always be followed by the 8 bit checksum The host controller must turn off its transmitter and enable its receiver within 10 millisec after sending the checksum in half duplex operation mode More details of the AMASSER ECN Protocol are provided in our website at www amassdata com 3 ECN Commands The ECQUE is a device that uses the ECN Protocol as an interface to your DCP or host and as such follows the guidelines set out in that protocol 3 1 ECN Command Symbols a address byte lt cr gt The carriage return character which is represented as Wd in the ASCII string lt cksum gt A one byte checksum which is the one s complement of the sum of all the bytes in the message including the carriage return byte but not includin
15. g The above information is believed to be true at the time of printing AMASS Data Technologies Inc reserves the right to modify specifications without notice All trademarks are owned by their respective companies AMASS Data Technologies Inc 812 Proctor Ave Box 707 Ogdensburg New York AMASS Data Technologies Inc 34 Chemin Helene Val des Monts QUEBEC J8N 2L7 TEL 819 457 4926 FAX 819 457 9802 13669 Email amassinf amassdata com TEL 315 393 3793 FAX 315 393 9017 21 APPENDIX A ECN Command Set for ECQUE Quick Reference ECN Retrieve Data Commands 1 Send Shaft Position in scaled Units e command aRO lt cr gt lt cksum gt e response a lt shaft position gt lt cr gt lt cksum gt 2 Start verification command e command aVO lt cr gt lt cksum gt e response at lt EEPROM status gt lt Processor Power status gt lt Checksum Ver Mode gt lt cr gt lt cksum gt 3 Read Value of Set up Parameter e command aS0 lt cr gt lt cksum gt or aS1 lt cr gt lt cksum gt etc e response a lt cr gt lt cksum gt ECN Set Commands 1 Set encoder Initial Level e command aSO lt initial level gt lt cr gt lt cksum gt e Response a lt cr gt lt cksum gt 2 Set encoder scale units per revolution e command aS1 lt scale gt lt cr gt lt cksum gt e Response a lt cr gt lt cksum gt 3 Set the CL ZERO 4 20 option only e command aS7 lt CL ZERO gt lt cr gt lt cksum gt e response a lt cr gt
16. g the one byte checkum itself Examples of checksums are shown in the sections that follow Command bytes one or two byte ASCII character command Ex MO Identification String AMASSDATA ECQUExxx where xxx firmware revision level 3 2 Retrieve Data Commands 3 2 1 Send Shaft Position in Scaled Units e Command aRO lt cr gt lt cksum gt e Response a lt shaft position in scaled units gt lt cr gt lt cksum gt This command instructs the ECQUE unit to measure the current shaft encoder position The ECN format for the response to this command is as shown above Note that the value returned for the shaft position is to be interpreted with the same engineering units used to define the Scale and H20 Level Example The ECQUE is set to address 0 and you wish to obtain the current encoder position Command ORO lt cr gt Response 0 13 232 lt cr gt n This response indicates that the current shaft position is 13 232 This value is to be interpreted with the same engineering units as used to define the Scale and H2O Level Therefore if the Scale was set in metres see section 3 3 2 and the H20 Level to metres above sea level the current level would be interpreted as 13 232 m above sea level 3 2 2 Start verification command e command aV lt cr gt lt cksum gt or aV0 lt cr gt lt cksum gt e response a lt EEPROM status gt lt Power interruption gt lt Checksum mode gt lt cr gt lt cksum gt This command is used to moni
17. hone line Another possibility is to interface the ECQUE directly to a host requiring a 4 20mA input option 4 20 These communication options are depicted below refer to section 5 2 Electrical for proper connections RS485 based ECN ECN host such as a programmable controller computer etc 4 20Ma host 4 20mA host D 4 20 mA output CQUE 4 20 water level sensor 4 20mA host The resolution of the encoder is 1 384th of a revolution standard when used with a stream stage pulley with a 375 mm circumference the resolution of the system is 0 98 mm When used with a 12 00 inch circumference pulley the resolution of the system is 0 03125 inches or 0 0026 feet It is a two channel optical incremental encoder that contains a lensed LED source integrated detectors and a codewheel which rotates between the emitter and the detector The ECQUE firmware provides a pulsed LED driver and signal transition detector that provides the 4x quadrature decoder function Hardware is powered from a 10 5 to 15 V input for external battery charger or power supply A 256byte EEPROM provides non volatile storage of the device address as well as the following set up data the encoder SCALE and H20 LEVEL the CL ZERO and cl SPAN 4 20 models only as well as the Checksum Verification Mode see 3 3 3 Checksum Verification Mode A 9 V alkaline battery provides backup a total of approximately 190 hours for LP
18. le of 1 000 may be entered as 1 but not as 1 1 or 1 Use set on repetitively to review the list of parameters and their respective values 4 4 Setting the Encoder Scale As explained in section 3 3 2 the parameter scale must be set equal to the circumference of the pulley mounted on the shaft encoder Most standard pulleys are either 0 375metres or 1 ft in circumference Begin by accepting the password as described above Use select until the word scale appears Press the set On switch Use the Edit switch to set the display equal to the circumference of the pulley mounted on the shaft then use set On to enter this value 4 5 Setting the el Zero 4 20 only As explained in APPENDIX B the parameter cl Zero cl stands for current loop must be set equal to the minimum anticipated water level that is the level for which the ECQUE 4 20 will output 4mA Begin by accepting the password as described above Use select until the word cl Zero appears Press the set On switch Use the Edit switch to set the display to the proper value as described in APPENDIX B then use set On to enter this value NOTE that when entering values for the cl Zero the decimal point must be present as these parameters are floating point variables The or sign must also be entered for these parameters For instance a value of 1 000 may be entered as 1 but not as 1 1 or 1
19. lley in use and the direction of shaft rotation Note that the H20 Level and Scale must be set with consistent engineering units usually ft or m In addition when initializing the Scale the user must be aware of the direction of shaft rotation with respect to water levels Clockwise rotation of the pulley represents rising water levels when the Scale is positive otherwise the scale must be set negative Example The current ECQUE address is 4 and you wish to initialize the encoder scale The pulley is 375 mm in circumference and the shaft turns counter clockwise with rising water levels Command 4S81 0 375 lt cr gt de Response 4 lt cr gt ee Note that the scale is entered in meters because the water levels will be measured in meters not mm Also note that the scale is entered as a negative value because in this instance the shaft turns counter clockwise when the water level is rising 3 3 3 Checksum Verification Mode 1 Command aS2 lt checksum verification mode gt lt cr gt lt cksum gt 2 Response a lt cr gt lt cksum gt This command is used to set the ECQUE to either verify or ignore the checksums of incoming messages This capability is useful when troubleshooting code for the ECN host The modes are as follows Checksum verification enabled Checksums ignored Mode 1 Mode 0 Example The current address is 3 and you wish to set the ECQUE to ignore the checksums of incoming messages Therefore the following command must be s
20. m gt e Response lt new address gt lt cr gt lt cksum gt This command changes the node address of the ECQUE In order to communicate with a particular ECQUE on the ECN bus the host and node ECQUE addresses must be the same Therefore it is necessary to update the host address following a change of node address Example The current host and node address is 4 and you wish to change the node address to 6 Command 4A6 lt cr gt G Response 6 lt cr gt be This response confirms that the new node address is 6 The host address must now be updated to 6 in order to communicate with the ECQUE The user can then confirm that the new host address is active by sending the acknowledge active command 12 4 Display Operation D Option The D option provides an 8 digit display and two double position switches that control the display and setup of parameters The setup parameters are only accessible however once the correct password has been entered The front of the unit appears as in Fig 1 123 456 Select Selection switch 8 Digit Display EDIT switch Figure 1 Front view of the ECQUE D The four switch positions allow the user to display the current fluid level as well as setup the following parameters the encoder H20 Level and Scale the CL ZERO and CL SPAN 4 20 models the node address for ECN communications and the Checksum Verification Mode The right switch is used to select the parameter
21. nter Green 6 Ground none 7 Ground Jumper across 7and 9 8 DATA Brown 9 Neg terminal of 9V Jumper across 7and 9 battery 5 3 2 ECQUE PMDM models 1 RJ11 Connector for telephone line 1 DB15P Connector DB15P Pin Assignments connected internally PIN SIGNAL 1 Ground to ECQUE 6 TxB Out to ECQUE from PMDM 7 5V to ECQUE 8 Ground from power supply 2 RxB In from ECQUE to PMDM 12V input from power supply All other pins unassigned 18 5 3 3 Option SW The SW option provides a switch closure for controlling an external relay as shown below This switch closure is rated up to 2 A ECQUE SW PIN ae 7 V current Loop supply a IN4004 EXTERNAL RELAY d PIN 2 l a IN4004 Figure 3 Relay configuration for ECQUE with SW option 5 3 4 Option 4 20 1 9 pin AMP CPC connector PIN SIGNAL Cable Color 1 Current Loop Red or white 5 End of Current loop Green Note that pin 5 is for an event counter in our standard models as shown in section 5 3 1 above All other pins are assigned as in section 5 3 1 5 4 Connection of 4 20 mA Current Loop 4 20 only Connect the two wires of the current loop see section 5 3 4 as shown below 12 30 VDC Current loop red or white cable Pin 1 Pin 3 ECQUE 4 20 lt End of Current loop Host eg green cable Pin 5 E PLC SCADA etc Precision resistor i 250 Ohms 19 5 5 Calibrati
22. on of 4 20 Current Loop 4 20 only Once the ECQUE 4 20 is connected as shown above it must be calibrated This is easily done with accurate results as follows 1 Use the Select and Set on switch positions until 4mA out is displayed on the screen Using a voltmeter measure the voltage across the precision 250 Ohm resistor There should be exactly V across the resistor If it is not remove the ECQUE panel from the enclosure and adjust the variable resistor labelled VR1 until a 1 V reading is obtained Use the Select and Set on switch positions until 20mA out is displayed on the screen 4 Using a voltmeter measure the voltage across the precision 250 Ohm resistor There should be exactly 5 V across the resistor Adjust the variable resistor labelled VR2 until a 5 V reading is obtained 5 The calibration is done uw 5 6 Jumper Configuration In order to operate the ECQUE the user must ensure that proper jumper configuration is made as per the RED ARROW in Figure 3 below Note that the jumper must be installed for 485 not HC The HC setting is when using the SDI 12 protocol I Figure 4 Location of HCMOS and RS485 jumper blocks Select 485 for RS485 operation 20 6 Specifications Processor Atmel 8988252 3 6864 MHz Word Size 8 bit data 8 bit instruction Memory 8988252 256 bytes RAM EEPROM 2 kbytes Shaft Encoder K Model Sensor type two channel
23. or remains mounted to the unit the 9V battery will provide backup if the power supply fails or becomes disconnected at the power supply not the ECQUE If the connector is removed at the ECQUE however the current shaft position is lost and the unit must be reinitialized using the SET commands or the display and switches This is because the connector closes the backup circuit through pins 7 and 9 see Connectors therefore the 9V battery backup facility becomes disabled if the cable is not mounted the unit Note that the backup is provided regardless of whether the cable is connected to a source or not as long as the connector is mounted to the ECQUE The open circuit that results when the connector is not mounted means that the ECQUE can be stored without depleting the 9 V battery The ECQUE communications is via ECN protocol see 2 ECN Protocol The hardware interface is thus RS485 The ECQUE may only be connected in half duplex mode HALF DUPLEX Wu e din Rx ECQUE fe aod D Di e CHE ado 2 Bi Tx te Rx FCQUE Pa add V Bi Up to 32 devices on the ECN bus Addresses 0 to 9 A to V 17 5 3 Connectors 5 3 1 Standard ECQUE 1 9 pin AMP CPC Connector Connections are as follows PIN SIGNAL Cable Color 1 12 Vin Red 2 none Blue 3 Ground Black 4 DATA White 5 Event Cou
24. orizontally over the stilling well A pulley is mounted to the unit by means of the aluminium clamping assembly which is threaded to the shaft The clamping assembly accepts standard L amp S or F amp P pulleys Any model may be used to indicate the position of any shaft which can be coupled or geared to the encoder shaft With suitable mechanical coupling linear positions may also be measured For more information on the physical characteristics of the ECQUE refer to Specifications 114 0 mm 89 9 mm O O 70 0 90 8 mm am O Q The 9 pin connector is on this face of the unit as well as the digital display and switches for Overall height w o pulley is about 165 0 mm D models Standard size pulley ordered separately Figure 2 Top view of ECQUE D with mounting brackets installed The sensor may be installed in any orientation that a particular application may require Weights or other mechanical loads at right angles to the shaft centre line should not exceed 10 1b 4 5 kg Larger loads will distort the bearings increase the starting torque and decrease the bearing life 16 5 2 Electrical The Encoder is internally protected against transient voltages and lightning surges on the signal input lines However IT IS ESSENTIAL TO PROVIDE PRIMARY EXTERNAL LIGHTNING PROTECTION The 9 V battery backup is only enabled when the 9 pin connector is secured to the unit Therefore if the connect
25. play to the desired value then use set On to enter it 4 8 Setting the Node Address The ECQUEND is an ECN device ECN is a multi drop protocol that is it allows up to 32 units on the same bus by using a node addressing scheme The node address by which ECN communication takes place is among the parameters that may be set on the display This is done in the same manner as with the other parameters select the parameter to be edited i e Node Adr use set on to view its current value use the EDIT switch as required then enter the value using set on Given that 32 ECN devices may be supported on a given bus the node addresses are numbered from 0 to 9 and from A to V NOTE The display does not allow the user to enter addresses from A to V This can only be done using the aA lt new address gt lt cr gt lt checksum gt command see section 3 4 3 The display comprises an auto power off feature It switches the display off following an inactive period of approximately 5 minutes in order to save energy Note that the ECQUE D consumes about 90 mA when the display is on 15 5 Installation 5 1 Mechanical All AMASS Data Incremental Shaft Encoders may be attached to a flat surface using 10 bolts or screws through the six holes located in the mounting brackets on the ECQUE housing as shown in Fig 2 When installed to measure water level it may be attached to a horizontal or vertical surface in a gauge house with the shaft extending h
26. tage in meters above sea level 2 ECN Protocol The Embedded Control Network ECN is configured as an RS 485 or modem based multi drop environment supporting up to 32 modules over a distance of 4000 feet on single or dual twisted pair cable The network operates at 9 6 or 19 2 Kbaud rates with the ability to increase these rates up to 115 2 Kbaud An additional pair is also specified for the routing of 24 Volt or Volt DC power The Embedded Control Network ECN protocol is configured as a master slave environment supporting a simple amp reliable multi node ASCII based command response message system Message strings begin with an address byte followed by the message body followed by a carriage return byte and terminated with an 8 bit binary checksum In order to communicate with the AMASSER ECQUE the host controller sends it a message The first byte of the message string is an address byte which consists of an ASCII character which represents the module s node address In order to support up to 32 remote nodes on a network the addressing scheme ranges from ASCII 0 30H to ASCII 9 39H then from ASCII A 41H to ASCII V 56H Following the node address byte is a one or two byte command that allow various I O operations to be initiated The ECN commands available to the host machine for the ECQUE are described in section 3 ECN Commands Following the command byte is the body of the message that contains the parameters required
27. to be displayed and or altered It is also used as an enter key to set the new values of setup parameters and as an on switch for the display The left switch allows the user to EDIT the value displayed at the screen The lower position of this switch is labeled with a right arrow and is used to select the digit that is to be edited the active digit is the one flashing on the screen The upper position which is labelled with an up arrow edits the active digit by scrolling through the available options 0 1 2 3 4 5 6 7 8 9 In short the value of a parameter is displayed and entered using set on If the value that is displayed is correct it may be left unaltered by simply reentering it using se on On the other hand any changes made to a value that has not yet been saved may be disregarded by using select 4 1 Displaying the Fluid Level To use the display to view the current fluid level simply turn it on with set On The current fluid level appears 4 2 Accepting Changing the Password Set up of the ECQUEND using the display is password protected setup can also be done using the ECN commands described in section 3 Begin by switching it on with set On The current encoder position i e water level is displayed Now use select until PASSWORD appears then use set On 000 appears The default password of 000 can now be edited to your own using the EDIT switch if you desire password protection When
28. tor the memory operational status the Checksum Verification Mode of the unit as well as to determine if the power supply has been interrupted The data buffers are defined as follows Data Buffer 1 Data Buffer 2 Data Buffer 3 EEPROM Power Supply interruption Checksum Mode 1 Operational or 1 Operational no interruption Oor1 0 Failure or 0 Interruption Example The current host address is 0 and you want the power supply status as well as determine if the checksum verification is enabled Command 0V lt cr gt 1 Response 0 1 1 0 lt cr gt af This would indicate that the power systems did not fail since the last verification and that incoming checksums are currently ignored To learn the significance of the Checksum Verification Mode refer to section 3 3 3 3 2 3 Read Value of Set up Parameter 1 Command aS0 lt cr gt lt cksum gt Or aS1 lt cr gt lt cksum gt etc 2 Response a lt data buffer gt lt cr gt lt cksum gt This command enables the user to read the current value of any given set up parameter Its use is simple Simply send the command normally used for setting the parameter in question but substitute the data value with the character Examples 1 The current sensor address is 3 and you wish to determine the current value of the shaft encoder scale Command 3S1 lt cr gt fe Response 3 0 375 lt cr gt 97 The current value of the shaft encoder scale is therefore 0 375 Re
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