Just a note
The Modbus async driver is avaliable on the fx40 you can purchase it from Johnson.
I have 4 of them running on differnt sites, the driver runs cuncurrently with lon and N2 the modbus goes on the 232 port and then to a b&b rs4859tb then off it goes with no 50ft limit
Well there ya go Cleancondenser. Put in a FX-40 and you have a first class webbased solution. with lon, and bacnet ability in reserve if you ever need them in the future.
There is no user work station
The N2 only has six devices on it
I did not see any Modbus info.
From my experiene w/ PLC controllers, you usually have to know quite a bit about the programming. This is b/c in the "RUNGS" you usually have to create coils and holding registers to view the values over Modbus. Modbus is pretty easy to work w/ if you have a points list w/ the holding register ###s. But if you don't know what they are it can be real difficult to figure out for newbies.
You mentioned that there is already a modbus to bacnet converter. Is the converter IP or MSTP? I use a program for monitoring/dignostics from a company called cimetrics. They specialize in Bacnet protocols...
The program is cheap and is called Bacnet Explorer XML. It is very easily to use and there tech support is great. If the customer isn't looking for a "front-end" this is a "down and dirty" way to monitor the BACnet points in the system.