MS/TP Troubleshooting

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This page is intended as a guide to troubleshooting BACnet MS/TP networks.

Curated List of the most common problems
Votes Description
1 Improper grounding - device not grounded
1 Improper grounding - common not grounded with 100R resistor to ground
1 Improper grounding - Shield not terminated
1 Improper Baud rate setting
1 Duplicate MAC address on segment
1 MAC address set beyond Max_Masters
1 Excessive traffic due to polling activity
1 Excessive traffic due to broadcasts elsewhere on the network
1 One bad device brings down the whole network


Troubleshooting Methods
Symptom Suggested Starting Point
I cannot see any devices on the MS/TP nework Quiet Network Checklist
etc Other