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+--- Thread: Ethernet and Slave Comms issues after thunderstorm (/thread-5867.html)
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RE: Ethernet and Slave Comms issues after thunderstorm - slychiu - 06-04-2026
The slave will only send zone changes when they occur, it does not automatically end a message when it i not doing anyting. It is best to check the event log to see if there is any slave zone troubke
RE: Ethernet and Slave Comms issues after thunderstorm - caravanboy - 06-04-2026
Ok, I'll monitor it for a few days and see if any other failures show up.
As I said, the zone messages from the Slave all seem to be fine.
RE: Ethernet and Slave Comms issues after thunderstorm - cc_uk - 06-04-2026
I too used to get a Comms failure on a CM9000 with a SEM01 Wasn't there an issue with the latest SEM01 firmware that caused a timeout while it searched for an EEPROM?
I fixed this by downgrading my SEM01 firmware. I believe there was due to be a newer update that would avoid this issue for the SEM. However wondering if caravanboy has this issue and why he gets the comms failure for a while.
RE: Ethernet and Slave Comms issues after thunderstorm - caravanboy - 06-05-2026
Interesting.
Just checked and my last batch of firmware updates (including SEM01) was Jan 2025. Apparently I had issues with getting the correct firmware at the time and Cytech had to point me at a different one. (from 7.141 to 7.207).
Guess what I also found from Dec 2025!!!! A note saying that after a system reset I DID have a Slave Comms failure.
I had no recollection of that!Thanks for the info! At least I know the slave probably was NOT damaged by the storm.
If this is the only time it causes the problem I can live with that then. Unless Cytech can advise if there is a newer firmware that fixes this timing issue?