Reading room humidity for VRC700 (register found, but in the "unusual" location)

[stadid]

Dear All,
Analyzing traffic exchange between gateway<->VRC700 while using MyVaillant app in the system with the singe heating circuit it was finally possible to find register which is responsible for the room humidity:

In order to read humidity you need to add the following to the 15.700.csv config file right before #includes section
i.e.

add

# ##### Room humidity #####,,,,,,,,,,,,,
*r,,,,,,B524,06000901,,,IGN:4,,,
r,,RoomHumidity,room humidity shown by regulator,,,,0700,,,exp,,,room humidity shown by regulator

before the following lines

# includes,,,,,,,,,,,,,
!include,errors.inc,,,,,,,,,,,,

Please check and confirm if you can read humidity using the above config changes.

What is unusual

The strange thing is that this register "location" 06000901 not present in the current 15.700 nor 15.ctlv2 configs,
moreover in VRC720 room humidity register is located in the "correct" Zone section (see below).

extract from 15.ctlv2.csv

# ##### zone 1 #####,,,,,,,,,,,,,
*r,,,,,,B524,02000300,,,IGN:4,,,
*w,,,,,,B524,02010300,,,,,,

r,,z1RoomHumidity,,,,,2800,,,EXP,,%,room humidity zone 1 

which is correct since any of the VR92 could read and report humidity.

Similar behavior should be observed for VRC700 (as 700 and 720 are very close in config structure) but instead we have completely different address.

Anyway, this behavior should be checked on the system with several heating zones and additional VR91 unit connected and mapped to the corresponding zone.

If somebody has system with VRC700+VR91 and using ebusd and MyVaillant app - could you check the following:

1. could you read humidity in the app for the heating zone mapped with VR91 unit ?
2. could you check the traffic and confirm which register is used by gateway for reading humidity.

[wurmthomas80]

Hi,
I'm using this register exactly like you described for a whild now and it works perfectly!
Thanks for investigating and sharing with us!

[Harted]

I can confirm this works for VRC700

#info
...
address 15: slave #2, scanned "MF=Vaillant;ID=70000;SW=0614;HW=6903", loaded "vaillant/15.700.csv"
...

Connected via tcp...

Define

define -r 'r,extra,z2Humidity,humidity zone 2,,15,b524,060009010700,,s,IGN:4,,,,,,exp,,%,current room humidity in zone 2'

Read

r z2Humidity
62

Works :)

VR91

I have one

#info
...
address 35: slave #3, scanned "MF=Vaillant;ID=VR_91;SW=0415;HW=4803"
...

So, I thought...

define -r 'r,extra,z1Humidity,humidity zone 1,,35,b524,060009010700,,s,IGN:4,,,,,,exp,,%,current room humidity in zone 1'

But no...

r z1Humidity
ERR: invalid position in decode

could you check the traffic and confirm which register is used by gateway for reading humidity.

How do I check the the traffic?

[stadid]

I can confirm this works for VRC700

#info
...
address 15: slave #2, scanned "MF=Vaillant;ID=70000;SW=0614;HW=6903", loaded "vaillant/15.700.csv"
...

Connected via tcp...

Define

define -r 'r,extra,z2Humidity,humidity zone 2,,15,b524,060009010700,,s,IGN:4,,,,,,exp,,%,current room humidity in zone 2'

Read

r z2Humidity
62

Works :)

VR91

I have one

#info
...
address 35: slave #3, scanned "MF=Vaillant;ID=VR_91;SW=0415;HW=4803"
...

So, I thought...

define -r 'r,extra,z1Humidity,humidity zone 1,,35,b524,060009010700,,s,IGN:4,,,,,,exp,,%,current room humidity in zone 1'

But no...

r z1Humidity
ERR: invalid position in decode

could you check the traffic and confirm which register is used by gateway for reading humidity.

How do I check the the traffic?

I believe your approach to link humidity to zone 2 is "logically incorrect" (while it perfectly suits your needs).
What I mean: VRC700 series regulator has humidity sensor which register in the ebusd configuration is not linked to any particular zone.
Native app (MyVaillant) checks to which zone VRC700 is mapped and automatically shows humidity for this specific zone.
In my current understanding, you could not read from VRC700 humidity of the zones mapped to VR91 units. (If you have MyVaillant app, you could confirm this by checking zone data - only zone mapped to VRC700 will show humidity while zones mapped to VR91 shows only temperature).

For VRC720 situation is different (also my assumption) - in 720 the main unit by himself reads humidity of the zones mapped to VR92 units and it could be read from VRC720 directly by using corresponding zone register.

So in short - If in the native app humidity is not shown for the zones mapped to VR91 - you'll be unable to read this parameter from VRC700. Maybe there is another approach to read humidity directly from VR91 unit, but I do not have info how to perform this.

[Harted]

So in short - If in the native app humidity is not shown for the zones mapped to VR91 - you'll be unable to read this parameter from VRC700. Maybe there is another approach to read humidity directly from VR91 unit, but I do not have info how to perform this.

I don't have the internet module for the MyVaillant app to work, so I can't say.

I did some grab(bing) grab result decode and see 3 records to destination35 but nothing seems to resemble the humidity value on the VR91, and in the undefined messages to destination 15 (vrc) i can't find any data which points to the humidity value. So far no luck.