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6. Troubleshooting
In this chapter, we will explain how to troubleshoot the communication problems.
Possible causes of TIMEOUT
Situation #1
:
The slave device is not active 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 pin on the slave device is properly connected
to the MDC-700.
Situation #4
:
An incorrect Baud Rate or/and Data Format setting is being specified.
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
Operating
Mode
1
9600
8
0
1
120
100
Master
2
9600
8
0
1
3000
1000
Master
3
9600
8
0
1
3000
1000
Master
4
9600
8
0
1
120
100
Master
5
9600
8
0
1
120
100
Master
