Home Automation Domotica Forum Europe, Bwired Forum

What is the best thermostat to work with the opentherm gateway? I like to dump my iSense (setpoint override issues)

Unfortunately there don't appear to be many thermostats out there that have properly implemented support for being controlled via opentherm. Almost all have their issues. I used to think Honeywell was doing much better than Remeha, but I've recently come to understand that the latest Honeywell thermostats are pretty bad in that respect as well.

In fact, the iSense should now work pretty well with the work-arounds I put into firmware 4.0b1. Which firmware are you using?

The only issue I haven't been able to reproduce with the loaner iSense I have tested with for almost a year is the setpoint drift. I still expect that to also be much improved with the new firmware, though.

So, if there are any issues left when using the iSense with the gateway on firmware 4.0b1, I would appreciate if you could send me a log showing the problem.

At 11:22 I've send a TT=19.5


11:22:06.660622 T10101380 Write-Data Room setpoint: 19.50
11:22:07.084377 BD0101380 Write-Ack Room setpoint: 19.50

11:22:17.279960 AC0091380 Read-Ack Remote override room setpoint: 19.50

And after a while it sets back to 19.00

11:29:43.626017 T90101300 Write-Data Room setpoint: 19.00
11:29:44.000966 B50101300 Write-Ack Room setpoint: 19.00

No manual change on the iSense or program.

I'm using 40b1

How do you send that TT=19.5? It doesn't appear to be via otmonitor (there's no "Command: TT=19.5" in the log). But similarly something is resetting the override setpoint:
11:29:06.220354 TT: 0.00

sappien wrote:What is the best thermostat to work with the opentherm gateway? I like to dump my iSense (setpoint override issues)

I also use the Isense room thermostat.
Since the latest versions of the firmware the Isense and OTG working fine together.

I can also temporarily adjust the temperature by Vera-Lite (Z-wave) and OTG plugin without any problem. The temporarily temperature is also maintained. So it should work. Also,I think that the thermostat Isense pleasant to work with. But that is personal.

I use a little script :

#!/bin/bash

/bin/stty -F /dev/ttyS0 9600 cs8 -parenb -icrnl -echo clocal -onlcr

exec 3<> /dev/ttyS0
echo -e 'TT=19.5\r' >&3

sappien wrote:I use a little script

Judging by the response found in the logs, something is doing something similar to switch off the override. Do you have another script or cronjob or whatever you may have forgotten about?

Didn't had time to do more test, this weekend I shall test again.

Hi,

I want to use my Remeha Callenta with iSense and the Homewizard.
But I can't find the "override" function on my iSense... is this supported?

Rob

You first have to set the configuration mode of the thermostat to extended: Menu -> Settings -> Users -> User mode -> Extended (Menu -> Instellingen -> Gebruikersinst. -> Gebruiksniveau -> Uitgebreid). Then you can allow the remote input: Menu -> Settings -> Installer -> Remote input -> Allow (Menu -> Instellingen -> Installateur -> Externe ingang -> Toestaan).

Yes,
I know but the externe toegang is not there, only "digi ingang"

Rob

Rob wrote:I know but the externe toegang is not there, only "digi ingang"

If you don't have the setting, it may still be factory set to on or off. Have you tried overriding the setpoint with the gateway? Does the thermostat even send MsgID 9?

Hi,
No, in fact I don't have a gateway yet, I am still looking for the right system. Homewizard seems a nice system, I can also connect it to a "smart meter" (slimme meter) . But I also like the open source Domotics maybe...

The first thing I want to make sure is that my iSense will be supported, so I am trying to find somebody who also has the callenta with the iSense, and can confirm that this can work. I think that because my iSense was maybe the first model, the setting is not there...

Rob

@Rob,

Witch firmware version does your Isense have?
Mine is running on version 23 (language version 18-01-2011)