Switch mirrors skip truths. A network tap like SharkTap shows both sides of BACnet/IP, preserving timing and packets so you can fix problems fast.

Tighten BACnet Max Master to the highest live MAC + buffer. Cut PFM roll-calls, shrink token rotation, and make MS/TP feel instant.

A 15-minute meter check to verify RS-485 line bias, termination, and Shield reference, so you stop ghost drops and fix comms with physics, not guesses.

The best $20 in BAS? A USB-to-RS-485 adapter. Tap MS/TP & Modbus, see the token, catch the culprit, and prove the fix, fast.

Seven copy-paste Wireshark filters, clean capture setups, and RS-485 wiring tips that solve 80% of BACnet/IP and MS/TP problems, fast.

“Auto” lies when something upstream has control. Find hidden overrides, VFD Local, bypass, safeties, priority arrays, and fix RS-485 noise that mimics overrides.

Most BAS failures hide in comm wires. Learn how a PicoScope reveals noise, shorts, and signal loss, saving hours of troubleshooting.

The essential BAS digital tools every tech should carry: Wireshark, Yabe, Nmap, Greenshot, and more to troubleshoot faster and prove results

Your system isn’t broken; it’s mis-configured. Fix the BACnet mistakes that cost you thousands, priority arrays, poll/COV, duplicate IDs, MS/TP timing, alarms, and trends, in under an hour.

Stop losing days to comm issues. Use this field-tested BAS communication troubleshooting playbook, ask the right questions, meter what matters, fix EOL/bias, normalize settings, and isolate fast.