In the eTwist manual I am reading that you need a Remeha Gateway if your boiler doesn't use the R-busprotocol. You must use the Gateway 16 if you're using a on/off or an OpenTherm thermostat and a Gateway 17 if your thermostat supports the BSB-protocol. So I guess the eTwist doesn't support OT.Willem wrote:The Remeha Tzerra Ace boiler has what they call an R-bus. This bus should be capable, according to the documentation, of running the OT protocol as well as some kind of specific Remeha protocol. The E-twist thermostat should also be able to talk Opentherm.
I have the Nodo shop opentherm gateway running and connected via Wifi to Openhab with the OpenTherm gateway binding installed, so far so good everything comes online as it should.
At the gateway side things are a bit more problematic. With only the thermostat connected and the reference set to 1.25V I am only seeing error 3 messages in the terminal and the thermostat does not connect.
When 1 set the reference to voltage to 0.625V (0) the error 3 message disappears and the thermostat keeps connecting disconnecting.
I am running version 4.2.5 firmwater.
I hooked up a scope to the Ot bus and that seems to look fine I have a base line of 6 volt and on that I have 10 volt pulses.
The thermostat sends out first 9 bits then a 6mSec pause followed by 18 bits this is then repeated every 500 mSec.
With nothing connected the gateway is sending out the following messages:
17:10:38.761797 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)
I found nothing on-line about connecting the Tzerra ace (new version of the Tzerra plus) with Etwist to the openhab gateway so I might be the first to try this.
I am a bit stuck at this moment and was hoping that somebody could help me forward.
Kind regards Willem
tools.remeha.nl/veelgestelde-vragen/wan ... way-nodig/