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Hi,

I finally got my OTGW working

I only have an ON/OFF thermostat.

When I connect my boiler to the OTGW, I see these messages every second:

22:00:05.305594 Error 03
22:00:05.412562 Error 03
22:00:05.502083 Error 03
22:00:05.622564 Error 03
22:00:05.739956 Error 03
22:00:05.839758 Error 03
22:00:05.961795 Error 03
22:00:06.081682 Error 03
22:00:06.131691 R00000000 Read-Data Status: 00000000 00000000
- CH enable: disabled (0)
- DHW enable: disabled (0)
- Cooling enable: disabled (0)
- OTC active: not active (0)
- CH2 enable: disabled (0)
- Summer/winter mode: winter (0)
- DHW blocking: unblocked (0)

When switching to monitor mode, the flow stops.
When sending commands like PR=B, the OTGW respons like expected:

22:07:26.561204 Command: GW=0
22:07:26.574153 GW: 0
22:07:26.585837 Error 03
22:07:30.079675 Command: PR=B
22:07:30.110158 PR: B=21:33 12-02-2015
22:07:38.865320 Command: PR=V
22:07:38.866416 Command: PR=T
22:07:38.867707 Command: PR=S
22:07:38.880221 PR: V=3
22:07:38.912533 PR: T=11
22:07:38.913732 PR: S=16.00
22:07:43.220090 Command: SC=22:07/3
22:07:43.221472 Command: SR=21:05,20
22:07:43.223002 Command: SR=22:7,223
22:07:43.245426 SC: 22:07/3
22:07:43.258894 SR: 21:5/20
22:07:43.273361 SR: 22:7/223
22:07:49.761065 Command: PR=B
22:07:49.791556 PR: B=21:33 12-02-2015

Is there anything I can try?


Stef

I'd try changing Vref... in another post I described something similar when Vref was either too low or too high...

I already tried that yesterday but that didn't helped.

For reference, the boiler is a Buderus logamax GB112.


Stef

It's a bit hard to tell from such a short log, but I assume that the gateway correctly detected that you have an ON/OFF thermostat. You should have seen a "Thermostat disconnected" message. It will then send an Opentherm message every second. The R00000000 message suggests that it does. There's just not an understandable response from the boiler.

Are you sure the Buderus logamax GB112 supports opentherm? The information I could find on-line doesn't give that impression. If you measure the voltage on the line from the boiler do you see an AC or DC voltage? Opentherm would be DC. If that's what you find you can also check the current when you short the leads. For opentherm that should be between 5 and 9 mA.

For the opentherm support, I also couldn't find out if my boiler is supported or not.
The only thing I found is that I can connect a 'Kamerthermostaat Logamatic iRT30'. I couldn't find out if this is an opentherm thermostat or not

The voltage is 11,3 V DC. The short lead current is around 13mA.

I have a full otlog if someone is interested. I uploaded it to http://www.docum.org/temp/otlog-20150520.txt

I tried different Vref settings, but that didn't helped.


Stef

11.3V is too low for opentherm and 13mA is too high. Most likely the iRT30 speaks some proprietary protocol. I'm afraid the OTGW isn't going to be much use with that boiler. No amount of adjusting Vref can fix that.

Ok, I was already afraid of that

If someone is interested in a soldered OTGW with USB or Serial interface, I have a spare one


Stef

Stef,

Heb je hem nog?

/Jasper

Hallo Stef,

Ben je nog in het bezit van de OTGW of heb je hem al weg gedaan.
Ik wil hem wel van je overnemen.

Groeten Wim Otten

Did you found a solution for the error 3?

Since the OP was trying to use the gateway with non-opentherm equipment, it's not really surprising he got errors.