Thermo Scientific 5028i Instruction Manual page 311

(0x05) Force (Write) Single
Thermo Fisher Scientific
The contents of register 10 are shown as the two byte values of 0x02
0x2B. Then contents of registers 11–13 are 0x00 0x00, 0x00 0x64 and
0x00 0x64, respectively.
The Force (Write) Single Coil function simulates the activation of the
digital inputs in the instrument, which triggers the respective action.
Coil
This function code is used to set a single action to either ON or OFF.
The request specifies the address of the action to be forced. Actions are
addressed starting at zero. Therefore, action number 1 is addressed as 0.
The requested ON/OFF state is specified by a constant in the request
data field. A value of 0xFF00 requests the action to be ON. A value
of 0x0000 requests it to be OFF. All other values are illegal and will
not affect the output. The normal response is an echo of the request,
returned after the state has been written.
Note This function will not work if the instrument is in service mode.
Request
Function Code
Starting Address
Output Value
Response
Function Code
Starting Address
Output Value
Error Response
Function Code
Exception Code
Here is an example of a request to write Coil 5 ON:
1 Byte 0x05
2 Bytes 0x0000 to maximum allowed by instrument
2 Bytes 0x0000 or 0xFF00
1 Byte 0x05
2 Bytes 0x0000 to maximum allowed by instrument
2 Bytes 0x0000 or 0xFF00
1 Byte Function code + 0x80
1 Byte 01=Illegal Function, 02=Illegal Address,
03=Illegal Data, 04=Slave Device Failure
MODBUS Protocol
Function Codes
Model 5028i Instruction Manual
s
C-7