Thermo Scientific Partisol 2000i Instruction Manual page 326

MODBUS Protocol
Function Codes
C-6 Partisol 2000i and Partisol 2000i-D Instruction Manual
Request
Function code
Starting Address
Quantity of Registers
Response
Function code
Byte count
Register value
Error Response
Function code
Exception code
Here is an example of a request and response to read registers 10–13:
Request
Field Name
Function
Starting Address Hi
Starting Address Lo
No. of Registers Hi
No. of Registers Lo
1 Byte 0x03 or 0x04
2 Bytes 0x0000 to maximum allowed by Sampler
2 Bytes 1 to maximum allowed by Sampler
1 Byte 0x03 or 0x04
1 Byte 2 x N (N = quantity of registers)
N* x 2 Bytes N = N or N+1
1 Byte Function code + 0x80
1 Byte 01=Illegal Function, 02=Illegal Address,
03=Illegal Data, 04=Slave Device Failure
(Hex)
0x03
0x00
0x09
0x00
0x04
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