Thermo Scientific Partisol 2000i Instruction Manual page 324

MODBUS Protocol
Function Codes
C-4 Partisol 2000i and Partisol 2000i-D Instruction Manual
with zeros (toward the high order end of the byte). The Byte Count field
specifies the quantity of complete bytes of data.
Note The values reported may not reflect the state of the actual relays in
the Sampler, as the user may program these outputs for either active closed
or open. ▲
Request
Function code
Starting Address
Quantity of outputs
Unit Identifier
Response
Function code
Byte count
Output Status
Error Response
Function code
Exception code
Here is an example of a request and response to read outputs 2–15:
Request
Field Name
Function
Starting Address Hi
Starting Address Lo
Quantity of Outputs Hi
Quantity of Outputs Lo
1 Byte 0x01 or 0x02
2 Bytes 0x0000 to maximum allowed by Sampler
2 Bytes 1 to maximum allowed by Sampler
1 Byte 0x00 to 0xFF (Passed back in response)
1 Byte 0x01 or 0x02
1 Byte N (N = Quantity of Outputs / 8, if the remainder
not equal to zero, then N=N+1)
n Byte N = N or N+1
1 Byte 0x01 or 0x02
1 Byte 01=Illegal Function, 02=Illegal Address,
03=Illegal Data, 04=Slave Device Failure
(Hex)
0x01
0x00
0x02
0x00
0x0D
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