Comfort Automation/ Security System Forums

Hi Chiu, I am having a few problems with my system after doing some upgrades. I have lost coms with my slave 01 after doing the upgrade. All I did was checked each module for updates and di them.
The last one was slave 1 and it upgraded to version 8.021 and when it rebooted at the end it states coms failure to slave 1 and of course I have no inputs from that point on.
I have re done the upgrade and all seems to work but I still have no coms to the at sem   

We will check the slave firmware again next week.
Is the slave the ARM version? if you bought it recently it would be
Did the firmware upgrade complete? If so can you reset the slave , or power it off and on again. If there is no communicatiions use the UCM firmware upgrading cable to upgrade the slave http://www.comfortforums.com/forum4/1782.html

Hi Chiu, Yes it did complete ok. No, it is not new it would be a good 7 years old I will send you a photo

Can you downgrade the slave firmware to 7.207 from here https://www.cytech.biz/download_files.php?item_id=1291 fir the time being using the UCM firmware upgrade cable

Hi Chiu, Just to let you know I downgraded to 7.207 as you suggested and all is working again. so it does look as if there is a bug in the new version P.S thanks for the help.

I had the same problem - Communications failure after upgrading SEM to 8.021. Using the programming cable I downgraded again to 7.207.

However I am now in a weird situation evertime comfort restarts it tells me communication failure SLAVE 1. When I log in via the keypad it will say communication failure restore and the error goes away. But next time Comfort is reset the same thing happens.

I Scan modules and see the slave there showing 7.207 firmware and zones on it work correctly.

I have tried a read modules (and then get told there is a mismatch and to scan again - which I do.

I then write selective (modules and settings) yet still when comfort restarts the error Communication failure

Please can you advise?

The problem is the old Slave board without EEPROM. It takes time to detect that the eeprom is not present so during that time after reset, the slave does not communicate
The new Slave with eeprom saves the ID in the eeprom as that does not have any ID switches
You can downgrade to 7.142 from this link https://www.cytech.biz/download_files.php?item_id=1254

Also reported here http://www.comfortforums.com/forum78/5600.html

Thank you for the quick reply. Is this something that future versions of the Comfort firmware will take into account? ie factor in the delay and then check for the SEM again? Or should I consider a new SEM module?

In in the UK so would purchase via www.laser.com. They list this as SEM02-M2 The picture of the board looks identical to the one I have so unsure if this is the new version.

we  will fix this in future for the old Slaves. Please check with laser as they may nt have updated their photos

(04-08-2025, 01:47 AM)slychiu Wrote: [ -> ]we  will fix this in future for the old Slaves. Please check with laser as they may nt have updated their photos

Are you able to confirm if this has been fixed yet?