I am a controls engineer with an independent in Northern NY and have worked with many control systems but I have a problem that has me stuck in a corner and I can't seem to get any help.
I have a local hospital as a customer where we do many of the out buildings with a Niagara AX frontend and a variety of BACnet based controls (JCI, KMC, etc). The main hospital has an existing Metasys system with a bunch of NAE's and N2 devices. We do these small out buildings such as doctors offices in old houses, etc because basically JCI told them they had no interest in driving 3 hours for a small job like that.
Since we have been working with the hospital for 2 years we have helped them with many service issues on the Metasys 5.0 system they have. They had a small building renovated and they added a NCE with a FCB using BACnet MS/TP. We later added a few devices to this same ms/tp bus to pick up some items missed, etc. JCI then came along and added another NCE with a FCB that only has 1 device on it in a small building.
Here is where my issue starts. They made both FCB's on both NCE's to be Trunk 1 and network 2000. This means that when I scan for BACnet devices I have 2 network 2000 and makes it so we cannot communicate with the devices below the NCE with many devices on the FCB. If we take out the newer NCE with only 1 device everything seems to work fine in the brief period we can have it offline.
They have SCT and I went in and tried to change the network number on the newer NCE but it will not let me save as it says I have a duplicate trunk number (I did not get the exact error). If I change it to trunk 2 and a new network number I loose communication with the device on the FCB. They have a service agreement with JCI and the tech came for his quarterly visit last Friday and the customer asked him to change it to another network number and he refused. He said that was only used by the internal system and if we were telling them it was a BACnet thing they we did not understand BACnet.
For the last 2 years we have worked on lots of sites with many controls vendors and have always been able to work together just fine but now I have no idea what to do. The customer believes us as he can see the issue it is causing and wants me to just fix it because he has had enough of JCI but this is one the first times we don't know what to do.
Are we doing something wrong that would make us have issues with 2 panels with a network 2000 or does the Metasys system do this to make the BACnet not work properly. The issue is it's own NCE seems to freak out and not command the panels on it's FCB after a power outage. Sometimes the points get commands and sometimes they don't until the next change of value (occ to unocc, etc)
Hoping someone can just give me a hint s to how to change the network number in SCT while leaving the trunk as number 1
Thanks for reading my rant!