Baud Rate JCI Fx JACE
Does anyone know if the JCI PCV 1630 VMA will 'auto baud' itself to a 76800 trunk?
There is an existing BACnet trunk that contains some Alerton equipment, and I would like to retro fit with JCI Fx controllers.. But I dont know if the JCI Fx will like the baud rate.. I think they come out of the box at 38k?
If it's like an MS-VMA1630, then it will come out of the box configured for auto baud rate, so you should be fine.
I actually got the PCG controller to come online by setting the baud to 76800 and changing a setting in PCT for the BACnet communication to be ANSI X3_4. This is a setting I found in workbench that was already set up on the JACE by the last contractor here for the Alteron controllers. The default BACnet com settings for JCI appears to be ISO...something
I was also worried this existing communication string wouldn't work because its only a 2-wire, not a 3-wire Rs485; but the device is online and there doesn't appear to be the need for a redundant communication network that I can see! Its a puny little office building under 40 devices..
Thanks for the reply!
From my understanding the third wire is not a redundant communication network but a signal reference, most two wire systems use the ground reference as their signal reference as well.
Originally Posted by HenryHub
"Open is as open does."
- Forrest Gump
"Can't we all just get a Lon?"
- Garry Jack
"BACnet: integration or interrogation?"
- The Janitor
"Open protocols? You can't handle open protocols!"
- Nathan R. Jessup
“What’s that? Aaa… open protocols? Don’t talk about…. open protocols? Are you kidding me? Open protocols? I just hope we can hardwire an interface!”
- Jim Mora http://www.youtube.com/watch?v=U7fjDS0jKiE
Here is a reasonable discussion on 2 wire vs 3 wire
Originally Posted by kontrolphreak
The first rule of any technology used in a business is that automation applied to an efficient operation will magnify the efficiency. The second is that automation applied to an inefficient operation will magnify the inefficiency. - Bill Gates