Control setpoint override issue

[tomecki]

Hi all,
I'm using De Dietrich Smart TC (with OT bridge) thermostat with De Dietrich Lumea MPX boiler.
I made simple script for setting control setpoint and sending this value each 30 seconds (if needed).
The problem is that OTGW sometimes writing value 7 degrees to the boiler, below log from otmonitor:

Code: Select all

09:20:43.989362	CS: 29.26
09:20:44.761058	T00110000	Read-Data 	Relative modulation level: 0.00
09:20:44.886599	BC0110000	Read-Ack  	Relative modulation level: 0.00
09:20:45.769461	T80190000	Read-Data 	Boiler water temperature: 0.00
09:20:45.879515	BC0191FB2	Read-Ack  	Boiler water temperature: 31.70
09:20:46.758081	T90181619	Write-Data	Room temperature: 22.10
09:20:46.885251	B50181619	Write-Ack 	Room temperature: 22.10
09:20:47.775733	T80000200	Read-Data 	Status: 00000010 00000000
09:20:47.779966	R00000300	Read-Data 	Status: 00000011 00000000
09:20:47.885197	B40000002	Read-Ack  	Status: 00000000 00000010
09:20:47.889414	AC0000202	Read-Ack  	Status: 00000010 00000010
09:20:48.781486	T90010700	Write-Data	Control setpoint: 7.00
09:20:48.785161	R90011D43	Write-Data	Control setpoint: 29.26
09:20:48.908619	B50011D43	Write-Ack 	Control setpoint: 29.26
09:20:48.915651	A50010700	Write-Ack 	Control setpoint: 7.00

Last year everything is working properly, OTGW was setting value 7 in the boiler after a minute of last CS command received.
I don't know if this behavior - sending 7.00 after my CS value is proper.
I was not making any firmware updates.
Can anybody help how to debug this issue further or how to proceed to fix this behavior?
Thanks in advance.

Below I attached pictures how this was working and how it is working actually (yellow - control set temperature read from boiler, blue - control set temperature send by CS command).

works.png (5.49 KiB) Viewed 2461 times

not_working.png (7.71 KiB) Viewed 2461 times

[hvxl]

Your log shows that the OTGW is sending 29.26 to the boiler, as requested.

[tomecki]

Thanks hvxl for quick reply.
And what is second Write-Ack in logs with ID A50010700?
I recorded more data and analyzed and I see now issue in logs.
On 21:59:41.213922 there is a CS command, and OTGW sent properly 3 times (21:59:42.790232, 21:59:47.797588, 21:59:52.787725) and then seems OTGW didn't overwrite 2 times control setpoint frames (22:00:00.094434, 22:00:06.112601).
Below log:

Code: Select all

21:59:41.213922	CS: 50.82
21:59:41.253434	T80000200	Read-Data 	Status: 00000010 00000000
21:59:41.259491	R00000300	Read-Data 	Status: 00000011 00000000
21:59:41.394165	B40000002	Read-Ack  	Status: 00000000 00000010
21:59:41.399085	AC0000202	Read-Ack  	Status: 00000010 00000010
21:59:41.565913	T80000200	Read-Data 	Status: 00000010 00000000
21:59:41.571988	R00000300	Read-Data 	Status: 00000011 00000000
21:59:41.690485	B40000002	Read-Ack  	Status: 00000000 00000010
21:59:41.699124	AC0000202	Read-Ack  	Status: 00000010 00000010
21:59:41.862877	T80000200	Read-Data 	Status: 00000010 00000000
21:59:41.868515	R00000300	Read-Data 	Status: 00000011 00000000
21:59:41.987622	B40000002	Read-Ack  	Status: 00000000 00000010
21:59:41.999553	AC0000202	Read-Ack  	Status: 00000010 00000010
21:59:42.782590	T90010700	Write-Data	Control setpoint: 7.00
21:59:42.790232	R900132D2	Write-Data	Control setpoint: 50.82
21:59:42.907170	B500132D2	Write-Ack 	Control setpoint: 50.82
21:59:42.913698	A50010700	Write-Ack 	Control setpoint: 7.00
21:59:43.783738	T00110000	Read-Data 	Relative modulation level: 0.00
21:59:43.893100	BC0110000	Read-Ack  	Relative modulation level: 0.00
21:59:44.784623	T80190000	Read-Data 	Boiler water temperature: 0.00
21:59:44.892728	BC0192900	Read-Ack  	Boiler water temperature: 41.00
21:59:45.787481	T001B0000	Read-Data 	Outside temperature: 0.00
21:59:45.898208	B601B0000	Data-Inv  	Outside temperature: 0.00
21:59:46.787252	T80000200	Read-Data 	Status: 00000010 00000000
21:59:46.795092	R00000300	Read-Data 	Status: 00000011 00000000
21:59:46.880973	B40000002	Read-Ack  	Status: 00000000 00000010
21:59:46.891257	AC0000202	Read-Ack  	Status: 00000010 00000010
21:59:47.790089	T90010700	Write-Data	Control setpoint: 7.00
21:59:47.797588	R900132D2	Write-Data	Control setpoint: 50.82
21:59:47.902286	B500132D2	Write-Ack 	Control setpoint: 50.82
21:59:47.911418	A50010700	Write-Ack 	Control setpoint: 7.00
21:59:48.784885	T00110000	Read-Data 	Relative modulation level: 0.00
21:59:48.902747	BC0110000	Read-Ack  	Relative modulation level: 0.00
21:59:49.794546	T80190000	Read-Data 	Boiler water temperature: 0.00
21:59:49.902480	B4019254C	Read-Ack  	Boiler water temperature: 37.30
21:59:50.790777	T900E6400	Write-Data	Maximum relative modulation level: 100.00
21:59:50.931985	B500E6400	Write-Ack 	Maximum relative modulation level: 100.00
21:59:51.791423	T80000200	Read-Data 	Status: 00000010 00000000
21:59:51.796869	R00000300	Read-Data 	Status: 00000011 00000000
21:59:51.896900	B40000002	Read-Ack  	Status: 00000000 00000010
21:59:51.903841	AC0000202	Read-Ack  	Status: 00000010 00000010
21:59:52.787335	T90010700	Write-Data	Control setpoint: 7.00
21:59:52.787725	R900132D2	Write-Data	Control setpoint: 50.82
21:59:52.912590	B500132D2	Write-Ack 	Control setpoint: 50.82
21:59:52.913249	A50010700	Write-Ack 	Control setpoint: 7.00
21:59:53.793374	T00110000	Read-Data 	Relative modulation level: 0.00
21:59:53.936389	BC0112800	Read-Ack  	Relative modulation level: 40.00
21:59:54.798180	T80190000	Read-Data 	Boiler water temperature: 0.00
21:59:54.909214	B40192319	Read-Ack  	Boiler water temperature: 35.10
21:59:55.798474	T90101500	Write-Data	Room setpoint: 21.00
21:59:55.930107	B50101500	Write-Ack 	Room setpoint: 21.00
21:59:56.796436	T80000200	Read-Data 	Status: 00000010 00000000
21:59:56.797022	R00000300	Read-Data 	Status: 00000011 00000000
21:59:56.906086	BC000000A	Read-Ack  	Status: 00000000 00001010
21:59:56.906722	A4000020A	Read-Ack  	Status: 00000010 00001010
21:59:57.078295	T80000200	Read-Data 	Status: 00000010 00000000
21:59:57.079355	R00000300	Read-Data 	Status: 00000011 00000000
21:59:57.203296	BC000000A	Read-Ack  	Status: 00000000 00001010
21:59:58.344571	ýOpenTherm Gateway 6.5
21:59:58.596038	T80000200	Read-Data 	Status: 00000010 00000000
21:59:58.729280	BC000000A	Read-Ack  	Status: 00000000 00001010
21:59:58.891013	T80000200	Read-Data 	Status: 00000010 00000000
21:59:59.002289	BC000000A	Read-Ack  	Status: 00000000 00001010
21:59:59.174289	T80000200	Read-Data 	Status: 00000010 00000000
21:59:59.297953	BC000000A	Read-Ack  	Status: 00000000 00001010
22:00:00.094434	T90010700	Write-Data	Control setpoint: 7.00
22:00:00.209192	B50011900	Write-Ack 	Control setpoint: 25.00
22:00:00.343753	SC: 22:00/5
22:00:01.092824	T00110000	Read-Data 	Relative modulation level: 0.00
22:00:01.202553	BC0112800	Read-Ack  	Relative modulation level: 40.00
22:00:02.345100	OpenTherm Gateway 6.5
22:00:02.608027	T80190000	Read-Data 	Boiler water temperature: 0.00
22:00:02.716558	B40192A7F	Read-Ack  	Boiler water temperature: 42.50
22:00:03.612819	T901815B0	Write-Data	Room temperature: 21.69
22:00:03.736339	B501815B0	Write-Ack 	Room temperature: 21.69
22:00:04.607171	T80000200	Read-Data 	Status: 00000010 00000000
22:00:04.746942	BC0000000	Read-Ack  	Status: 00000000 00000000
22:00:04.919197	T80000200	Read-Data 	Status: 00000010 00000000
22:00:05.028488	BC0000000	Read-Ack  	Status: 00000000 00000000
22:00:05.201941	T80000200	Read-Data 	Status: 00000010 00000000
22:00:05.332064	BC0000000	Read-Ack  	Status: 00000000 00000000
22:00:06.112601	T90010700	Write-Data	Control setpoint: 7.00
22:00:06.223702	B50011900	Write-Ack 	Control setpoint: 25.00

Do you know why this happened or any settings can cause this?

[hvxl]

As explained on the website, a report where the first letter is an 'A' is a response from the OTGW to the thermostat. The thermostat requested a control setpoint of 7.00 ('T' message). The OTGW changed that to 50.82 before sending it to the boiler ('R' message). The boiler acknowledged the request from the OTGW ('B' message). But if the OTGW would send that to the thermostat, it might get confused because it asked for 7.00. This is why the OTGW acknowledges the request from the thermostat with the value it requested ('A' message).

At 21:59:58.344571 and 22:00:02.345100 the OTGW reports the firmware name and version it is running. This is an indication that it experienced a reset. The CS command is not retained across a reset, which is why the OTGW doesn't modify the control setpoint a few times. However, the OTGW should not spontaneously reset. Use the PR=Q command to check the reason for the reset.

[tomecki]

Thank you hvxl for all explanations.
I checked reset reason and I got:

Code: Select all

08:44:13.910083	Command: PR=Q
08:44:14.545856	PR: Q=B

According to documentation:
B - Brown out (supply voltage dropped below 4.35V on PIC16F88 or 2.7V on PIC16F1847)

I also checked if reset is happening when only thermostat setting control setpoint and in this situation there is no reset.
My HW is from Nodo:
https://www.nodo-shop.nl/en/featured/21 ... teway.html
and with Wemos D1 WiFi.
I will try to change power supply and check if this will still occur.

[tomecki]

Hi again,
I change power supply and USB cable and second day everything is working fine.
Thanks a lot to hvxl for helping in fixing this issue.