https://wiki.domoticz.com/index.php?action=history&feed=atom&title=Opentherm_Gateway_OTGWOpentherm Gateway OTGW - Revision history2026-09-18T23:02:47ZRevision history for this page on the wikiMediaWiki 1.46.0https://wiki.domoticz.com/index.php?title=Opentherm_Gateway_OTGW&diff=18507&oldid=prevWalter vl at 12:36, 26 February 20242024-02-26T12:36:49Z<p></p>
<p><b>New page</b></p><div>The OpenTherm Gateway (aka OTGW) is a device that allows to view OpenTherm data from your thermostat and boiler or heating system.<br />
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Furthermore, it can be used to change settings, e.g. update the setpoint.<br />
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More information on the OpenTherm Gateway can be found on http://otgw.tclcode.com.<br />
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===Hardware===<br />
The OpenTherm Gateway hardware can be ordered through online shops e.g. Nodo Shop.<br />
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===Installing in Domoticz===<br />
After connecting the OTGW to the boiler, thermostat and to the network by Wifi or the Domoticz server by USB, the OTGW can be added to Domoticz.<br />
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Go to '''Setup - Hardware''' and select <code>Opentherm Gateway USB</code> or <code>Opentherm Gateway with LAN Interface</code>.<br />
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*Fill in an understandable name (eg Boiler Brandname or OTGW)<br />
*For USB fill in the USB serial port name where it is connected (use the /dev/serial/by-id address or for older OS: do not forget to set [[PersistentUSBDevices|Persistent USB device]])<br />
*For LAN interface enter the IP address and the port on which the OTGW device is connected.<br />
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After clicking on the Add button the hardware entry is created and Domoticz will connect to the OTGW and will add (after some time) 28 devices to the [[Setup Devices|device list]]. <br />
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DHW: Domestic Hot Water system for supplying hot tap water. <br />
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CH: Central Heating <br />
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CH2: Second Heating circuit/system? <br />
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OTC: Outside temperature compensation. <br />
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GPIO: The OTGW has Input/output contacts that can be used for various operations, see documentation on http://otgw.tclcode.com. <br />
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[[File:OTGW devices2.png]] <br />
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===Outdoor temperature and Commands===<br />
[[File:Otgw hardware.png]]<br />
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To select an outside temperature sensor to be used with OTGW, click on the Setup button in the Hardware list.<br />
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[[File:Otgw setup.png]] <br />
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Select an outside temperature sensor that is already present in Domoticz or use the temperature sensor that is connected to the OTGW.itself. <br />
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When there are no physical outside sensors available, it is possible to create a virtual one by adding one of the Domoticz hardware Weather gateways (Buienrader, Darsky etc). These gateways will supply a virtual local outside weather temperature sensor that can be used by OTGW. <br />
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It is also possible to send commands to the Boiler or Heating system. See for more info http://otgw.tclcode.com/firmware.html#operation<br />
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Commands can also be set with Domoticz API json commands, for using in automation see link [[Domoticz API/JSON URL's#Opentherm%20Gateway%20Custom%20command|Domoticz API/JSON URL's]] <br />
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'''Supported OTGW firmware versions in Domoticz''': 5.x (Domoticz stable 2021.1) <br />
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For questions and discussions about the OTGW, please use the [https://www.domoticaforum.eu/viewforum.php?f=75 Opentherm Gateway Forum] on Domoticaforum.eu.<br />
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For questions and discussions on OTGW and Domoticz please use the [https://www.domoticz.com/forum/viewforum.php?f=26 OTGW subforum] on Domoticz.com</div>Walter vl