User Manual

ADAM-6000 Series User Manual 244
B.1.2 Modbus Function Code Introductions
To full-fill the programming requirement, there is a series of function
code standard for user’s reference…
Function Code 01
The function code 01 is used to read the discrete output’s ON/OFF status
of ADAM-6000 modules in a binary data format.
Request message format for function code 01:
Example: Read coil number 1 to 8 (address number 00017 to 00024) from
ADAM-6000 Modules
01 01 00 17 00 08
Table B.1: Response Comment Structure
Code
(Hex)
Name Usage
01 Read Coil Status Read Discrete Output Bit
02 Read Input Status Read Discrete Input Bit
03 Read Holding Registers Read 16-bit register. Used to read integer
or floating point process data.
04 Read Input Registers
05 Force Single Coil Write data to force coil ON/OFF
06 Preset Single Register Write data in 16-bit integer format
08 Loopback Diagnosis Diagnostic testing of the communication port
0F Force Multiple Coils Write multiple data to force coil ON/OFF
10 Preset Multiple Registers Write multiple data in 16-bit integer format
Command Body
Station
Address
Function
Code
Start
Address
High Byte
Start Address
Low Byte
Requested Number
of Coil High Byte
Requested Number
of Coil Low Byte