I keep having to replace/reprogram hoistway Lon brds. Can anyone tell me why these keep going out? I can't seem to find the smoking gun as to why.
NV Checksum error: IDTag 54
Bad data received from the NV memory-Net Manager Database.

Get a cable tester and verify your rj45 connectors are ok. I have seen those things get corroded quite a bit.

I haven't turned on a tac20 in a bit so going from memory. The NV is non volatile memory, sounds like the learn gets corrupted. I would start with the battery on the 188e board. I remember it being a small barrel style.

If this doesn't clear you up, PM me. I will try and swing by one of the older jobs and peak and tweak a little for ya.