M1G and RS485 runs with the XSP+TR60

[DotNetDog]

My Elk M1G setup is pretty big (I think). I have 7 XINs and will get 2 more soon. I have quite a few devices that need power (glass breaks, occupancy sensors, and more) so wiring this up was a chore. In fact, I had to contact AO who hooked me up with Brad at Elk to decide the best way to configure my system.

As a result of several emails, we decided to run 2 485 runs off the M1G main board. The first run uses the power off the bus. The 2nd run gets powered from a P212S power supply.

OK, so now I am connecting my thermostats. I have 5 RCS TR60 thermostats...these are RS485 connected devices that attach to the Elk M1Gs serial interface (XSP).

Finally, we are getting to my question... I know that the M1G install manual is VERY adament about no more than 2 RS485 bus runs. So does the RS485 off the serial board count? Since it is run from a seperate board (the XSP) I am hoping that I am still OK. If not then I will have to reconfigure my runs off the M1G board to be only one run. I can reconfigure the power requirements if I have to.

 

[gatchel]

The Databus RS485 runs and the XSP Thermostat RS485 runs are two different things...for starters. They are mainly talking about the databus runs with regards to what you are reading in the manual.

The thermostat runs should still conform to the RS485 spec, 4000' max, terminate only at the ends of the data runs, etc.

I would start at the XSP terminating there, and then run to the control modules for the thermostats terminating at the last unit on the chain. With a daisy chain wiring configuration the XSP can really be anywhere on the chain, at the end or the middle as long as only the end devices are where the termination points exist. The 485 communication is actually wired to the ZCV1 units not the actual thermostats themselves, right?