Despatch P1400+ Temperature Controller - Manual (Page 67)

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Force Single Coil (Function 05)
Writes a single binary value to the Specified Instrument Bit address.
Table 19. Force Single Coil (Modbus Function 05)
QUERY
Function Address of Bit State to write
05 HI LO FF/00 00
RESPONSE
Function Address of Bit State written
05 HI LO FF/00 00
The address specifies the address of the bit to be written to. The State to write is FF when the bit is
to be SET and 00 if the bit is to be RESET.
Note:
The Response normally returns the same data as the Query.
Pre-Set Single Register (Function 06)
Writes two bytes to a specified word address.
Table 20. Pre-Set Single Register (Modbus Function 06)
QUERY
Function Address of Word Value to write
06 HI LO HI LO
RESPONSE
Function Address of Word Value written
06 HI LO HI LO
Note:
The Response normally returns the same data as the Query.
Loopback Diagnostic Test (Function 08)
Table 21. Loopback Diagnostic Test (Modbus Function 08)
QUERY
Function Diagnostic Code Value
08 HI =00 LO=00 HI LO
RESPONSE
Function Sub-function Value
08 HI=00 LO=00 HI LO