ICP DAS USA MDC-700 Series User Manual page 27

Situation #5: The ID for the slave device is not correct in the polling definition.
Solution: Check and fix the difference of ID number between the polling definition and the slave
device.
Situation #6: The Timeout or PollDelay setting is not long enough.
Solution: Lengthen the Timeout or PollDelay setting until it is suitable for communication with the
slave device.
ComPortNo BaudRate DataBit Parity StopBit Timeout PollDelay
1
2
3
4
5
Possible causes of ERROR messages
Situation #1: ERROR: ILLEGAL FUNCTION. The FunctionCode used in the polling definition is not
an allowable action for the slave.
Solution: Correct the FunctionCode parameter.
UseComPort SlaveModbusID FunctionCode RegStartAddr RegCount
2
2
2
2
2
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9600 8
9600 8
9600 8
9600 8
9600 8
1
1
2
2
3
0 1 120
0 1 3000
0 1 3000
0 1 120
0 1 120
3 178
3 124
3 178
3 124
3 178
Operating
Mode
100 Master
1000 Master
1000 Master
100 Master
100 Master
2
1
2
1
2