I service building that has about 60 feild devices, unt's,vav-101 and DX9100,
Supervisery controller is a NCM 350. All of the network is offline, No work has been done in the building for a while. No floods no power failures, NOTHING! What DC Volts should I be looking for between com And(+) com and (-) on the N2 bus I was told it's adout 2.7 DC Volts. I need to know if there is a cut in the network. If there is a cut what should the volts be. I checked all N2 connections at all DX9100 because they are AHU'S and RTU'S. All connections are good. If I wanted to separate the N2 bus, how do I know which way the cut or bad connection is. Any help would be great.