Opentherm Gateway

[Bwired]

Done

[vanisher]

Jan-Jacob,

It can take a while for the setpoint change to be picked up by the thermostat. Can you post logs of your attempts somewhere? In otmonitor, go to 'File -> Save to logfile' to start recording the messages to a file.

Schelte.

Hi Schelte,

I found out that i had to enable 'remote access' on the isense. It was disabled by default. Now it's working!

Thanks!
Jan-Jacob

[hvxl]

I found out that i had to enable 'remote access' on the isense. It was disabled by default. Now it's working!

Jan-Jacob,

Great that it's working for you now. I've had reports before that something had to be enabled on the iSense, but it has never been clear to me exactly which setting should be changed. When I look at the installation manual, my best guess would be "Settings -> Installer -> Remote Input" (Or for Dutch devices: "Instellingen -> Installateur -> Externe ingang"). However, according to the same manual, the factory setting for that one is already "Allow". Can you indicate exactly which setting you had to change and where it is in the menu structure? That could be helpful for the next person with an iSense that comes along.


Schelte.

[Lennart]

Ok, the OpenTherm Gateway boards I ordered have arrived! These boards are blue with ENIG finish (= golden pads for good solderability). I have about 5 boards left for sale. Same price as set by Akatar (EUR 6,50). If you're interested, you can send me a PM.

UPDATE: all available boards have been reserved.

Lennart

[vanisher]

@Schelte, when i''m at home i will write down the options.

For now i see an Error 01 once in a while:

11:34:55.114178 Thermostat disconnected
11:34:55.150168 Error 01

In a 16 hour period about 19 times.

[hvxl]

@Schelte, when i''m at home i will write down the options.

For now i see an Error 01 once in a while:

11:34:55.114178 Thermostat disconnected
11:34:55.150168 Error 01

In a 16 hour period about 19 times.

First off: 19 errors in 16 hours is not really something to be worried about.

Does the "Thermostat disconnected" message accompany the error every time? That message indicates that the line towards the thermostat has been high for 10 ms, which should not happen during normal communication. It actually sounds more like a bad contact than just a transition at the wrong time.

However, if you don't normally see the disconnected message and the errors bother you, you could try issuing an IT=1 command to the gateway. That disables the check that results in the error 01 report if it fails.

Schelte

[Francois]

Je hebt een PM !

1 voor mij graag.

[Templar]

Lennart, I am interested but can't send a PM.

[Lennart]

@Templar: you've got a PM.

[Sanka]

Hi,

If there is one left over I'm interested.

Sanka

[gvdham]

Me too, maybe start a new batch? How did u all program the PIC?

[Rene]

@Schelte: Just connected the gateway to my newly installed Remeha Calenta CW6 and iSense. Everything seems to be working OK. Is it correct the Opentherm Smart Power feature is not supported? The backlight of the iSense is not working without batteries when the gateway is in between.

[Lennart]

For anyone still interested in a board: I'm willing to have another batch made. See this topic:

http://domoticaforum.eu/viewtopic.php?f=15&t=7848

Lennart

[hvxl]

Is it correct the Opentherm Smart Power feature is not supported? The backlight of the iSense is not working without batteries when the gateway is in between.

That is correct. For one thing, I don't know the exact specifications for the Smart Power feature. They are not described in version 2.2 of the OpenTherm Protocol Specification, which is the only version I was able to find on the internet. And even if the specifications would be available, I suspect adding this feature would complicate the interface circuitry quite a bit.

But if anyone has those specifications, I would be interested to see them. Maybe I will be able to come up with a solution.

[Michelo]

Just a thought : OT 3.0 thermostats are backwards compatible with the old spec. I think an OT 3.0 thermostat requests to the boiler if it support smartpower (deliver low, medium or high current). With the reply of the boiler the thermostat knows that it can use the backlight. With no reply the thermostat thinks that smartpower is not supported (low) and will rely on battery power for the backlight.

Isn't it a case of finding the right bits to convince the thermostat it can use the backlight?