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BAS MS/TP Trunk Lab

Most MS/TP faults are on the wire or in four settings, and the front end can’t tell you which. This lab gives you a live trunk with a router and a string of controllers, a meter you can put on any device, an MS/TP frame capture, and each controller’s settings. Find the fault, make the call, fix it, and prove the whole trunk is healthy.

  1. Read the work order
  2. Meter it, capture it, check the settings
  3. Make the call, fix it, verify
0 of 13 trunks practiced

Choose a trunk

TutorialThe next place to look is outlined, and the coach explains what you’re seeing and why it matters. It moves on when you do it.
PracticeSame trunk, no outlines. Collect the evidence, make the call, fix it and verify. Hints cost 10 points, a wrong call 15.
What’s modelledRS-485 termination, bias, polarity and shield grounding; token passing, Poll For Master, Max Master, Max Info Frames, baud and MAC addressing.

Trunks Wiring, termination and bias, configuration and performance faults

    The meter checks come from the book

    BAS Communication: A Field Reference walks the RS-485 test sequence used here: ohms with the trunk down, idle volts, common mode, polarity, then the settings. Read the free articles on MS/TP wiring and Max Master and Max Info Frames.

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