Moxa Technologies PCI Express Board User Manual page 74

PCI Express Boards
8. Go to the properties screen and select COM Port needs to be diagnosed. Click Start Diagnosis and then
when the CAUTION message appears, click OK.
9. Adjust "non-MOXA" devices according to the Status.
Status
Waveform Distortion
Receive Reflect Signal Long distance
Data Error
NOTE The Diagnosis tool is extremely sensitive, and consequently could indicate errors even if the communication
status okay. In this case, you can decide whether or not to make the suggested configuration changes.
10. Repeat from Step 6 until the communication is okay.
Cause
Too many devices
Too many devices & long distance
4-4
Intelligent RS-485 Settings
Adjust Pull-High Adjust Terminator
/Low Resistor Resistor
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