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1. The RM 3 reboots on three conditions failure of self test watchdog time out no processor activity for approx 8 ms or no data received within a configurable time out period Radio Receiver Signal to Noise Ratio The radio receiver SNR is reported in the range of 6 to 13 dB or 0 if less than 6 dB The receiver SNR will report as 0 if not used such as when connected to a modem Priority Queues If all the RM 3 packet buffers are in use high priority packets will preempt other packets High priority packets include channel 0 data SOH and timestamp packets that are not retransmitted AII other packets are low priority LED Indicators The RM 3 has six bicolor red or green LEDs on its front panel which are used to indicate its status and the integrity and type of the data being received During start up all six LEDs are turned on red and then green for one half second each In the explanation given below long and short indicate that pulses last 7096 and 209 respectively of the expected packet duration calculated using the configured baud rate and packet length Received Data These LEDs are labeled Rx1 4 corresponding to the four receive channels available on an RM 3 After startup these LEDs indicate the quality of the data being received on a particular channel RX LED STATUS MEANING off no synchronization bytes received long red pulse CRC error detected long green pulse good data packet received short green pulse2. reported as 2 5 V Parameter Range Temperature 50 C to 150 C Battery OV to 20V External Input 25V to 25V RM 3 User Manual 3 RM 3 Radio Repeater Multiplexer User Manual Menu System To go to the menu system hit the M key This brings the main menu to the screen as displayed in figure 2 Direct options at this menu are to set the serial number the debug port baud rate download new firmware program user settings read stored user settings read factory default settings and go to normal operation Sub menus from this menu include the Configuration and Baud Rates Menu the Time out and Packet Length Menu the Log Parameters Menu and the Hardware Test Menu Repeater Set up Menu Serial number 002047 Configuration and Baud Rates Menu Time out and Packet Length Menu Log Parameter Menu Debug port baud rate 19200 Hardware Test Menu Download new firmware Program user settings Read stored user settings Read factory default settings Go with current settings QUA unumJurdaotcu Figure 2 Main menu Main Menu Selections Serial Number From the main menu hit the S key to set the serial number in the range of 0 to 2047 Follow the prompting instructions Debug Port Baud rate From the main menu hit the B key to set the debug port baud rate to one of 1200 2400 4800 9600 14400 19200 28800 38400 57600 baud The software will not allow a setting other than those in this list Downloa
3. Rx1 Tx1 Rx3 Rx2 Tx1 Rix Tx1 Rx Tx 3 ta 1 Reg Rx4 Rx2 Rx3 Tx2 Rx1 Tx1 Rx4 RxZ Tx1 4 to 1 N A N A Fixed Fix Figure 1 Available RM 3 Configurations RM 3 User Manual 2 RM 3 Radio Repeater Multiplexer User Manual External Hardware Interface Radio Port This connector is a male 25 pin D subminiature right angle mounted directly to the Repeater PCB Port Signal Levels and Polarity PIN SIGNAL PIN SIGNAL 1 BAT 14 RX2 2 BAT 15 SNR2 3 BAT 16 DGND 4 BAT 17 RX3 5 TXI 18 SNR3 6 KEYTXI 19 DGND 7 DGND 20 RX4 8 TX2 21 SNR4 9 KEYTX2 22 DGND 10 DGND 23 EXT INPUT 11 RXI 24 RXDBG 12 SNRI 25 TXDBG 13 DGND The RM 3 uses both RS 232 and CMOS signal levels for inputs and outputs as described in the table below SIGNAL DIRECTION LEVELS POLARITY RX1 4 RXDBG input RS 232 high for mark low for space SNRI 4 input CMOS high for good low for bad zero crossings average for SNR RS 232 high for mark low for space KEYTX1 2 output CMOS high turns on low turns off transmitter carrier State Of Health The state of health SOH inputs are measured by a 10 bit analog to digital converter on the microprocessor of the RM 3 The table below gives the ranges of these inputs The SOH inputs are all accurate to within 3 If the external input SOH is left disconnected it will typically be
4. from the RM 3 main menu to display the menu shown in Figure 5 This menu allows the setting of parameters that control the RM 3 internally producing data to send to the central site Log Parameters Menu V Verbosity 0x00 0 S SOH update period 60 minutes Configuration update period 0 hours Figure S Log Parameters Menu Verbosity The RM 3 currently ignores this parameter however it should be left as O for forward compatibilty SOH Update Period The RM 3 will create SOH bundles containing analog state of health information as well as statistics for every enabled serial receive port and forward it the central site when a packet is filled Press the S key to change the interval that the RM 3 produces these bundles This does not change RM 3 User Manual 6 RM 3 Radio Repeater Multiplexer User Manual the rate at which the RM 3 outputs the state of health information to the debug port Specify an interval in minutes between 1 1 minute and 1000 16 hours 40 minutes Configuration Update Period The RM 3 currently ignores this parameter however it should be left as O for forward compatibilty Hardware Test Menu The hardware test menu was initially a software development tool As such it is for the most part obsolete and unsupported and will not be documented It is obtained by hitting the H key from the main menu Some selections may not work any longer or may disrupt RM 3 operation Some features here may occasionally be use
5. RM 3 Radio Repeater Multiplexer Manual RM 3 Radio Repeater Multiplexer User Manual History Approval Style Sheetis X Company SmartMasters NMX Manual Filename is X Company Manuals ReferenceManual Components RM 3 RevC RM3Manual lwp Rev Date Author Description A 03 Jun 97 Nick Ackerley X Initial release B 26 Jul 00 Glenn Greig Updates to all sections C 24 Jan 01 Chris Cordahi Updates to configuration packet length menu log parameters menu operation data format Table of Contents Overview RadIO POL USUS esatto Was coat ans ES ma Port Signal Levels and Polarity cnet nen LL La St te Of Health se SE ERE EN E c EE ED PERE ES EN GS Menu System Main Menu Selections sions ese vr va Na PS BONG SUELE VEA SE OE CU ES LE Configuration and Baud Rates Menu Time out and Packet Length Menu ss essen Log Parameters Menu i ooi casi sais GA TIC ihid P eame rs Hardware Test Meri sees edet DESA DEN EES REUS et edel Redi ned DES Software TESt MENU uero eeu USE NOME Suid EE Li Operation Operating and Storage Requirements Start up Behaviour 5 Luis rsrs tione y e crom a o eL AL peg he C E doe ess Details Of Operation uoo o Dr boe ty ubt H
6. d New Firmware From the main menu hit the F key to download new firmware Then send the firmware file using your terminal emulation ASCII upload command Program User Settings After changing the user settings and when you decide that you wish to retain them hit the P key The settings will be saved to permanent memory and the RM 3 will restart in about 1 second The RM 3 operation will not switch to any new settings unless they are first programmed Read Stored User Settings If after changing the user settings you wish to restore what you began with hit the R key The user settings will be restored from permanent memory Read Factory Default Settings If you wish to restore the factory default user settings hit the D key The factory default user settings will be restored from permanent memory The RM 3 will not run with these values unless they are first programmed Go to normal operation After you are done in the menu system and have no desired changes to be made to the user settings hit the G key or the ESC key to go to normal operations The user settings will be those that were in effect at the time of entry to the main menu If any user settings were changed but not programmed they will not be in effect RM 3 User Manual 4 RM 3 Radio Repeater Multiplexer User Manual Reboot RM 3 Though not appearing in the main menu the RM 3 may be forcefully rebooted by hitting the z key Configuration and Baud Rates Menu This menu al
7. ful in very limited circumstances Use at your own risk Software Test Menu This menu does not even appear as a selection in the main menu It is obtained by hitting the J key Like the hardware test menu it was initially a software development tool and is for the most part obsolete and unsupported and will not be documented Some selections may not work any longer or may disrupt RM 3 operation Some features here may occasionally be useful in very limited circumstances Use at your own risk RM 3 User Manual 7 RM 3 Radio Repeater Multiplexer User Manual Operation Operating and Storage Requirements The RM 3 has the following maximum and minimum requirements Parameter Minimum Maximum Supply Voltage 9V 16 5 V Operating Temperature 20 C 50 C Storage Temperature 40 C 125 C Humidity 5 90 95 Power consumption by the RM 3 is typically 100 mA Start up Behaviour Self Tests The RM 3 performs the following tests on startup e Cycle all LEDs red then green Test SRAM e Test USCI and USC2 read write registers Details of Operation Multiplexing The RM 3 multiplexes data from up to four sources into one by simple time division multiplexing The data packets are basically sent in the order in which they were received except for some packets which have a higher priority which are sent in order ahead of low priority packets Data Format The data direction data format used is the Nanometrics MX T
8. g Any of the following values are acceptable 1200 2400 4800 9600 14400 19200 28800 38400 57600 baud For example hit the C key to change the Rx3 baud rate Modem Control This option specifies that the link to the central site via Tx1 and possibly Rxl if a duplex configuration is selected is a modem The modem control signals RTS CTS and DCD are active in this mode To change the modem mode hit the M key Select 1 to have modem operation or select O to not have modem operation The corresponding hardware must be installed for modem operation Radio Mode Selection of Radio Mode causes the data to be scrambled This is done due to the requirements of the radio receiver demodulators To change the radio mode hit the R key Select 1 to have radio mode active or select O to not have radio mode active RM 3 User Manual 5 RM 3 Radio Repeater Multiplexer User Manual Time out and Packet Length Menu This menu allows setting the data direction packet length some time out values and the broadcast transmitter preamble length The menu is displayed in figure 4 Time out and Packet Length Menu D Data Port D packet length 15 bundles P Broadcast Transmitter preamble length 192 bytes T Reboot time out no data received 120 seconds M Modem power cycle time out 0 seconds Figure 4 Time out and Packet Length Menu Setting Data Direction Packet Length The data direction packet length is adjustable in size from 1 to 59 bu
9. good filler packet received Note that if an Rx LED is off then there are three possible explanations no data whatsoever is being received the baud rate is incorrect or the scramble byte is incorrect Transmitted Data These LEDs are labeled Tx1 2 corresponding to the two transmit channels available on an RM 3 After startup these LEDs indicate when data and filler are being sent on a particular channel TX LED STATUS MEANING off nothing transmitted long red pulse not used long green pulse data packet transmitted short green pulse filler packet transmitted RM 3 User Manual 9 RM 3 Radio Repeater Multiplexer User Manual Monitoring Operation on the Debug Port The RM 3 has 2 operational states Normal Operation and Menu System When in Normal Operation state all features are active and the debug port will display state of health information In the Menu System state access to configuration and troubleshooting features of the menu system is obtained via the debug port Packets are still received and forwarded but internally generated state of health packet creation is suspended In normal operation the debug screen displays state of health information every 5 seconds display will look similar to Figure 6 This allows immediate knowledge of the operational characteristics when installing The unit must be left in this mode in the field for all features to work For example state of health informat
10. ide Oa eres AG tu ee s A diea oes Monitoring Operation on the Debug Port RM 3 Radio Repeater Multiplexer User Manual Overview RM 3 Radio Repeater Multiplexer User Manual The RM 3 is an essential component of wide aperture digital telemetry networks Typically a repeater site includes an RM 3 along with up to four radio receivers and one or two radio transmitters Data is received by the repeater checked for integrity and then retransmitted Only good packets of data are retransmitted The RM 3 is available in simplex duplex and broadcast configurations A simplex RM 3 transmits data in one direction only from distant sites to a site which is closer to the central site This is referred to as the data direction In duplex configuration the RM 3 allows a second transmitter so that the central sites can request that data from digitizer sites be retransmitted This direction is referred to as the broadcast direction In broadcast configuration the RM 3 multiplexes the requests from up to three central sites into one broadcast transmitter The RM 3 can multiplex up to four streams of data into one by simple time division multiplexing This allows a single repeater site to service several digitizer or repeater sites The RM 3 can interface the data output stream and the broadcast input stream to a modem This interface includes the modem control signals RTS CTS and DCD All RM 3s monitor state of health of the repeater site including te
11. ion is not generated while in the menu system Time in long seconds 865259054 Hit M Rx Bytes Received Rx1 31796619 RX2 438091724 Tx Data Pkts Queued Tx1 1007443 Tx2 449317 Temperature 31 for the menu IR to reset Data Filler Packets Packets 449317 0 1479998 84614 Data Pkts Filler Sent Sent 782250 100 449316 0 78 Battery Voltage Rx and Tx values Bad Discarded Frame Overrun SNR Packets Packets Errors Errors 0 0 0 0 0 0 473057 30 Packets Packets To Be Sent Preempted Low High Priority 224579 613 0 0 di 0 12 46 External 11 97 Figure 6 Typical debug screen showing state of health information This document information G Manuals amp graphics Manuals ReferenceManual Components RM 3RevOCRM3Manual lwp Date created 8 7 96 Date last revised Jan 24 2001 RM 3 User Manual 10
12. lows the selection of one of the available Rx Tx configurations the setting of the baud rates for each of the receivers and transmitters and the selection of modem control and radio mode options The current configuration is displayed Any receiver or transmitter that is not active in the current configuration will display a on the Link line and the Baud Rate line Configuration and Baud Rates Menu Current configuration 3 1 Duplex Rx1 Rx2 Rx3 Rx4 Tx1 Tx2 Link D data B broadcast B D D D D B Baud Rate 9600 9600 9600 9600 9600 9600 Available Configurations 1 1 1 Simplex 5 1 1 Duplex 8 1 1 Broadct 2 2 1 Simplex 6 2 1 Duplex 9 2 1 Broadct 3 3 1 Simplex 7 3 1 Duplex 0 3 1 Broadct 4 4 1 Simplex M Modem Control Tx1 and Rx1 0 R Radio mode scramble byte A5 1 Change Baud Rate A Rxl C Rx3 E Txl B Rx2 D Rx4 TX2 Figure 3 Configuration and Baud Rates Menu Choosing an Rx Tx Configuration Select one of the possible configurations by hitting the corresponding key For example hit the 1 key for 1 1 Simplex operation Any receiver or transmitter that is not active in the new configuration will display a on the Link line and nothing on the Baud Rate line The RM 3 will not run with these values unless they are first programmed Changing a Receiver or Transmitter Baud Rate Select the appropriate key for the Rx Tx resource of interest and enter a new baud rate according the promptin
13. mperature battery voltage one external input and the receiver signal to noise ratios This information is periodically sent to the central site When no data is received for a configurable time out period the RM 3 automatically reboots to guard against improper configuration Similarly when no data is received on the broadcast receiver when in duplex modem mode the RM 3 automatically power cycles the modem power to guard against the modem malfunctioning The central site supports this feature by periodically sending a keep alive message The RM 3 has 2 operational states Normal Operation and Menu System When in Normal Operation state all features are active and the debug port will display state of health information In the Menu System state access to configuration and troubleshooting features of the menu system is obtained via the debug port Packets are still received and forwarded but internally generated state of health packet creation is suspended RM 3 User Manual 1 RM 3 Radio Repeater Multiplexer User Manual Configuration The RM 3 can multiplex up to four streams of data into one and can support simplex and duplex links The available configurations are depicted in Figure 1 In all configurations the left of the RM 3 represents the remote stations and the right represents the central site Simplex Duplex Broadcast Rx Tx1 Rx Tx Rx Tx 1 to 1 l Tx Rx Tx Rx2 Rx2 Tx1 Rx2 Tx1 Rix Tx2 Rx3 Rx3 2 to 1 Rx Tx2
14. ndles This corresponds to a length of up to 1024 bytes per packet RM 3 firmware versions 1 32 and later will forward packets of any length up to the packet length specified Earlier versions will only forward packets having the exact packet length specified Hit the D key to set the data port packet length Broadcast Transmitter Preamble Length The broadcast transmitter is keyed Radio links need some characters to be sent in advance of the broadcast packets to initialize the radio link so that data characters will not be lost Hit P to set the preamble length in bytes in the range of 1 to 1000 Reboot Time out The RM 3 will reboot if it has not received a packet for a certain time This feature guards against internal failure conditions Hit T to set the Reboot time out in seconds in the range of 0 to 65535 seconds A value of 0 disables this feature and no reboots will occur Modem Power Cycle Time out The RM 3 will power cycle the modem if in modem mode and a duplex configuration is selected if a packet is not received from the central site for a certain time This feature guards against a modem failure The central site supports this feature by periodically sending a message even when no retransmit request messages are necessary Hit M to set the modem time out period in seconds in the range of 0 to 65535 seconds A value of 0 disables this feature and no power cycling of the modem will ever occur Log Parameters Menu Press the L key
15. ransmission Data Format Data is transmitted in packets containing bundles of information containing compressed signal or state of health data Each packet consists of a header containing 2 synchronization bytes and a time stamp a configurable number of bundles of 17 bytes in length and a 2 byte CRC code RM 3 firmware versions 1 32 and later can process packets of varying length up to a user specified maximum earlier versions will only process fixed length packets The broadcast direction data format is a fixed size packet containing 2 synchronization bytes a 26 byte bundle and a 2 byte CRC code Transmission Modes There are two transmission modes available radio and non radio In radio mode incoming data is unscrambled before checking for errors then scrambled again before retransmission In non radio mode there is no scrambling or unscrambling Whenever a packet is transmitted by the RM 3 the corresponding LED is flashed momentarily green Error Checking The RM 3 automatically verifies cyclic redundancy codes CRC Whenever a frame error or an incorrect CRC is detected the corresponding Rx LED is momentarily flashed red and the packet is not retransmitted If the packet is good then the corresponding Rx LED is flashed green Configuration The configuration of the RM 3 can be changed by a Nanometrics field engineer using the configuration port RM 3 User Manual 8 RM 3 Radio Repeater Multiplexer User Manual Reboot Control
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