Strange (shifted) output in otmonitor

This Forum is about the Opentherm gateway (OTG) from Schelte

Moderator: hvxl

Strange (shifted) output in otmonitor

Postby visserej » Wed Aug 28, 2013 8:56 am


I've been using the Opentherm Gateway for about 6 months now without any issues. I connected the gateway (USB version from to a Raspberry Pi with DomotiGa server.
Unfortunately when I restarted the RaspberryPi last week after an update, DomotiGa is not able to connect to the gateway through /dev/ttyUSB0 anymore.

After starting the otmonitor tool, I noticed that all the information is somehow shifted:

09:54:18.446520 0000B4200
09:54:21.832173 0090T1000
09:54:21.858866 0090BD000
09:54:21.866939 0190T8000
09:54:21.882930 0193B4900
09:54:21.894867 0010T9A00
09:54:21.909368 0010BFA00
09:54:21.922299 0000T8200
09:54:21.937442 0000B4200
09:54:25.333712 0101T1000
09:54:25.349602 0101BD000
09:54:25.366057 0190T8000
09:54:25.385865 0193B4900
09:54:25.401040 0010T9A00
09:54:25.415859 0010BFA00
09:54:25.834664 0000T8200
09:54:26.638865 0000B4200

Can anyone point me in the right direction?
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Re: Strange (shifted) output in otmonitor

Postby hvxl » Wed Aug 28, 2013 9:21 pm

My guess is that the USB-Serial converter is confused (I see no way the gateway could actually be sending this). Can you still send commands? What happens when you issue a PR=A command?

Maybe a reset of the gateway will clear things up. If you have the latest alpha firmware (4.0a6) you can try the GW=R command. Otherwise I suggest to power-cycle the gateway to restore service as quickly as possible.
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Re: Strange (shifted) output in otmonitor

Postby visserej » Thu Aug 29, 2013 9:02 pm

Thanks for your reply. Resetting the gateway did not help. Today I was able to flash the firmware to 4.0a6 after which the output was normal again but only in monitor mode.
Gateway mode lists only Error 1´s for me. For now I flashed the rom back to 3.4 and everything works fine again. I will post my findings about 4.0a6 in the beta test topic.
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