I will monitor the system closely. If the cause is a short then I too suspect that it might be the door station since it is the only cable that is in the ground (in a conduit)
I seem to be having endless problems with my Comfort system.
This is the third incidence since my last post. Switching the system off for 14+ hours seems to bring the system back to life and stays that way for a week or so.
The event log shows communication failures which start with one module and affect all the rest
As I have said in the previous post this is because of either the bus wire shoirted to soemthing or a faulty module which pulls down the whoe bus
In the Rs485 bus topology any device which has a fault which pulls down the bus will affacte the whole bus
When this happens again, do NOT switch off the Comfort system as that will not solve the problem or identify what is the cause
You have to disconnect each module from the bus until the Communications recovers - you will get Communications restore messages
The last device disconnected will be the culprit
This assumes that a module is faulty but the cause is just as likely to be a bus wire shorted at the modules not with the modules themselves
Yes, the RS485 bus is the KA/KB wires which connect all Comfort modules together
The cable used should be CAT 5 or equivalent twisted pairs
This should be checked thoroughly as wiring is usualy the main cause of problems, eg loose connections, shorts, open circuit, high resistance, not using twisted pairs etc
