Laurel Electronics LTSE6 - Manual - Manual (Page 18)

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4. 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. SUPPORTED FUNCTION CODES
FC10: Write Multiple Registers (FC10 = 16 dec)
Writes internal registers containing input data for analog output and relays.
Register Address
Dec Hex
Data Type Destination
107 006B Hi Word Hex Value Hi Word Applied to Item3
108 006C Lo Word Hex Value Lo Word Applied to Item3
FC05: Write Single Coil
Action command to transmitter
Output Address Output Value Action Command
00 01 FF 00 Transmitter Reset (No Response)
00 03 FF 00 Latched Alarm Reset
6. MESSAGE FORMATTING
MA = Device Address DD = Data (Hex) CL = CRC Lo Byte
FC = Function Code WW = Data (On/Off) CH = CRC Hi Byte
RA = Register Address SF = Sub-Function CR = Carriage Return
NR = Number of Registers EC = Error Code LF = Line Feed
NB = Number of bytes LRC = ASCII Checksum
Modbus RTU Format
Byte Number
FC Action
> 3.5
Char
1 2 3 4 5 6 7 8 9 10 11
05
05 Request
Response NoTx
NoTx MA
MA FC
FC RA
RA RA
RA WW
WW WW
WW CL
CL CH
CH
10
10 Request
Response NoTx
NoTx MA
MA FC
FC RA
RA RA
RA NR
NR NR
NR NB
CL
DD*
CH
DD* CL CH