Laurel Electronics LTM CTR SERIES PULSE, AC or PROCESS TOTALIZER INPUT, SERIAL DATA OUTPUT - Manual (Page 29)

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4.0 COMMUNICATIONS SETUP
Parameters selectable via Instrument Setup software, distributed on CD ROM:
Serial Protocol ...............................Custom ASCII, Modbus RTU, Modbus ASCII
Modbus ASCII Gap Timeout...........1 sec, 3 sec, 5 sec, 10 sec
Baud Rate.......................................300, 600, 1200, 2400, 4800, 9600, 19200
Parity .............................................No parity, odd parity, even parity
Device Address .............................0 to 247
5.0 SUPPORTED FUNCTION CODES, TM TRANSMITTERS W/ ANALOG INPUT
FC03: Read Holding Registers
Reads internal registers containing setup parameters (Scale, Offset, Setpoints, etc.)
FC10: Write Multiple Registers (FC10 = 16 dec)
Writes internal registers containing setup parameters (Scale, Offset, Setpoints, etc.)
FC04: Read Input Registers
Reads measurement values and alarm status. Returns values in 2's Complement Binary Hex
format without a decimal point. The displayed system decimal point can be read with FC03 at
address 0057. Use only odd Register Addresses and an even number of Registers.
Register
Address
TM Transmitter Response
------- -----------------------------------------------
00 01
Returns Hi word of Alarm status
00 02 Returns Lo word of Alarm status
00 03 Returns Hi word of Measurement value
00 04 Returns Lo word of Measurement value
00 05 Returns Hi word of Peak value
00 06 Returns Lo word of Peak value
00 07 Returns Hi word of Valley value
00 08 Returns Lo word of Valley value
FC05: Write Single Coil
Action command to meter
Output Output
Address Value Action Command
------- -------- ----------------------------------------
00 01 FF 00 Transmitter Reset (No Response)
00 02 FF 00 Function Reset (Peak, Valley)
00 03 FF 00 Latched Alarm Reset
00 04 FF 00 Peak Reset
00 05 FF 00 Valley Reset
00 0C FF 00 Tare Command (Weight Transmitter) (00 00 resets Tare)