Troubleshooting - ICP DAS USA MDC-714i User Manual

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
1
2
3
4
5
Copyright © 2014 ICP DAS Co., Ltd. All Rights Reserved. ∗ E-mail: service@icpdas.com
DataBit Parity
9600 8 0
9600 8 0
9600 8 0
9600 8 0
9600 8 0
StopBit Timeout PollDelay
1 120
1 3000
1 3000
1 120
1 120
Operating
Mode
100 Master
1000 Master
1000 Master
100 Master
100 Master
- 45 -