Troubleshooting - ICP DAS USA MDC-700 Series User Manual

3. Troubleshooting
In this chapter, we will explain how to troubleshoot the communication problems.
Possible causes of TIMEOUT
Situation #1: The slave device is not turned on or the transfer function of the slave site may fail.
Solution: Check the slave device is powered up and the communication function is enabled.
Situation #2: The COM port number to which the slave device is connected is not the same with the
UseComPort setting in the polling definition.
Solution: Connect the slave device to the COM port number that is defined in the polling definition,
or fix the UseComPort parameter to the virtual COM port number that the slave device is
connected to.
Situation #3: The wiring for communication is wrong.
Solution: Exchange the D+ and D‐ wiring of RS‐485 connection, or exchange the Rx and Tx wiring of
RS‐232 connection, and check the GND wiring is correct between the slave device and the
MDC‐700 module.
Situation #4: The Baud Rate or/and Data Format settings in the polling definition are incorrect.
Solution: Check and fix the difference of the Baud Rate and Data Format settings between the polling
definition and the slave device.
ComPortNo BaudRate DataBit Parity StopBit Timeout PollDelay
1
2
3
4
5
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9600 8
9600 8
9600 8
9600 8
9600 8
0 1 120
0 1 3000
0 1 3000
0 1 120
0 1 120
Operating
Mode
100 Master
1000 Master
1000 Master
100 Master
100 Master