Connecting more than one controller, thermostat, etc.

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

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Connecting more than one controller, thermostat, etc.

Postby rjblake » Thu Dec 08, 2016 11:49 pm

Hi all - glad to have found this site. Probably a stupid question, but although I can find all of the above on the OTGW.TCLCODE site, I am not sure regards connecting them up. Does it mater which order the 'Toon boiler module' and the 'OTGW' are connected?

i.e.
1. Toon Thermostat -> Toon Boiler Module -> OTGW -> CV Ketel, or
2. Toon Thermostat -> OTGW -> Toon Boiler Module -> CV Ketel

From what I can find, the Opentherm standard will work with 2 controllers (perhaps more?) connected in serial. Am I correct in my assumptions or completely wrong?

I would just try it out, but still waiting on delivery of my PIC before I can hook it up. Great bit of kit - thanks Schelte for making it available!
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Re: Connecting more than one controller, thermostat, etc.

Postby Templar » Fri Dec 09, 2016 12:56 am

rjblake wrote:Hi all - glad to have found this site. Probably a stupid question, but although I can find all of the above on the OTGW.TCLCODE site, I am not sure regards connecting them up. Does it mater which order the 'Toon boiler module' and the 'OTGW' are connected?

i.e.
1. Toon Thermostat -> Toon Boiler Module -> OTGW -> CV Ketel, or
2. Toon Thermostat -> OTGW -> Toon Boiler Module -> CV Ketel

From what I can find, the Opentherm standard will work with 2 controllers (perhaps more?) connected in serial. Am I correct in my assumptions or completely wrong?

I would just try it out, but still waiting on delivery of my PIC before I can hook it up. Great bit of kit - thanks Schelte for making it available!


If I remember correctly, the communication between the Toon Thermostat and Toon Boiler Module isn't Opentherm. So you should go for 1. Toon Thermostat -> Toon Boiler Module -> OTGW -> CV Ketel. It surely works for me.
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Re: Connecting more than one controller, thermostat, etc.

Postby marcelr » Fri Dec 09, 2016 9:20 am

1. Toon Thermostat -> Toon Boiler Module -> OTGW -> CV Ketel

Correct. The other way around is a no-go.
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Re: Connecting more than one controller, thermostat, etc.

Postby rjblake » Fri Dec 09, 2016 11:14 am

Thanks @marcelr & @Templar for the quick responses and clear information. Will connect as confirmed working.
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Re: Connecting more than one controller, thermostat, etc.

Postby hvxl » Sun Dec 18, 2016 5:29 pm

Due to the delays introduced by each Opentherm gateway, there is a limit of around 6 gateways that can be inserted between the OT master and slave. However, as Templar and marcelr already indicated, the Toon boiler module is not an Opentherm gateway. It is actually the Opentherm Master. The connection between the Toon thermostat and the Toon boiler module uses some proprietary interface. Putting the OTGW there will either just not work, or could possibly damage something in either the Toon or the OTGW.
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Re: Connecting more than one controller, thermostat, etc.

Postby marcelr » Sun Dec 18, 2016 6:53 pm

hvxl wrote:The connection between the Toon thermostat and the Toon boiler module uses some proprietary interface. Putting the OTGW there will either just not work, or could possibly damage something in either the Toon or the OTGW.

Been there, done that. When you put the OTGW between toon and the module, nothing works. After putting everything in the right place, nothing was damaged (at least in my case, YMMV), and everything worked as it is supposed to. Signal levels probably are more or less the same for the two protocols (24VDC + some modulation).
Lesson 1: never use the same colour of wiring for everything (blue and red), chances are it will get mixed up ;-).
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