links

• http://www.ab-log.ru/smart-house/heating-automation/vaillant-rs232
• http://www.ab-log.ru/smart-house/heating-automation/gaz_meter
• http://old.ethersex.de/index.php/Vaillant_X6_Schnittstelle

boiler serial port

5V TTL level serial but it also accepts 3.3V serial (tested with CP2102 which is 3.3V, but 5V tolerant)

1 Not used
2. +5 V (for the first version of the power adapter vrDIALOG, for the operation of the converter RS232-TTL)
3. RX (from the computer to the boiler)
4. TX (from the boiler to the computer)
5. Ground (earth)
6. +24 (Apparently new power adapter on bus eBUS)

Serial port is 9600 8N1

vrDialog

Vailant program to monitor boiler and change parameters

• http://www.vaillant.nl/professioneel/service-1/software-downloads-1/
• http://old.ethersex.de/index.php/Vaillant_X6_Schnittstelle

protocol

This is translated and extended version of protocol dump from link above to ease comparison with my boiler

The first line - that we send, the second - the answer of the boiler.
Third line (if exists is difference in my response)
In parentheses is the value that we get.

Something like initialize the connection.
# 07 02 00 00 00 04 C4
# 08 00 00 9E 0A 0C 6B FD
< 08 00 00 93 0B 09 FB 0B

Minimum design flow temperature
# 07 00 00 00 C2 01 7C
# 04 00 [# 23] 33
35 degrees

Start hysteresis
# 07 00 00 00 C3 01 7E
# 04 00 [# 02] 12
2 °

Hysteresis off
# 07 00 00 00 C4 01 70
# 04 00 [# 06] 16
6 °

Left before the service
# 07 00 00 00 AC 02 A3
# 05 00 [# 0B C2] #FC
3010 hours

Maximum temp filing for DHW
# 07 00 00 00 A6 01 B4
# 04 00 [# 55] 45
85 degrees

Maximum time the boiler heating
# 07 00 00 00 66 01 2D
# 04 00 [# 2D] 3D
45 degrees

Adjusting the outer t-pair (if connected to the boiler sensor outdoor t-ry)
# 07 00 00 00 65 01 2B
# 04 00 [# 00] 10
0 degrees

Maximum design temp boiler
# 07 00 00 00 E1 01 3A
# 04 00 [# 46] 56
70 degrees

Pump run after the end of heating (after turning off the burners)
# 07 00 00 00 64 01 29
# 04 00 [# 1E] 0E
30 minutes

Collector temperature (if also the boiler sensor is connected)
# 07 00 00 00 B8 02 8B
# 06 00 00 00 00 60
0 degrees

Maximum flow temperature heating (in my case only the range of 60 to 83 degrees)
# 07 00 00 00 A5 01 B2
# 04 00 [# 52] 42
82 degrees

Vrebya pump run after turning off the boiler
# 07 00 00 00 63 01 27
# 04 00 [# 12] 02
18 (180)

Shifting values ​​hotstart
# 07 00 00 00 9D 01 C2
# 04 00 07 17
7

Partial heat. Boiler
# 07 00 00 00 A9 01 AA
# 04 00 [# 01] 11
1 kW

Hours on GVS
# 07 00 00 00 22 02 A6
# 05 00 00 00 28
0

Cycles of heating
# 07 00 00 00 29 02 B0
# 05 00 00 [# 2B] 03
43

Cycles DHW
# 07 00 00 00 23 02 A4
# 05 00 00 00 28
0

There is a feedback controller
# 07 00 00 00 74 01 09
# 04 00 00 10
0 (OFF)

Status signal DCF
# 07 00 00 00 69 01 33
# 04 00 00 10
0 (no reception)

VUV Mittenstellung
# 07 00 00 00 45 01 6B
# 04 00 00 10
0 (OFF)

Counter 3 ignition attempts
# 07 00 00 00 6F 01 3F
# 04 00 0A 1A
10

Unsuccessful automatic ignition
# 07 00 00 00 1F 01 DF
# 04 00 0A 1A
10

Number of trips thermal protection
# 07 00 00 00 20 01 A1
# 04 00 00 10
0

Outdoor temperature
# 07 00 00 00 6A 03 37
# 06 00 FC 39 AA 63
-60.44

T-pa boiler SC down
# 07 00 00 00 B6 02 97
# 06 00 FF 21 AA 5F
-13.94

T ra feed
# 07 00 00 00 18 03 D3
# 06 00 01 76 00 88
23.38 / no errors

Start the timer by GVL
# 07 00 00 00 71 01 03
# 04 00 01 11
1 (ON)

Mode
# 07 00 00 00 08 01 F1
# 04 00 01 11
1 (winter)

Request to heat DHW C1 / C2
# 07 00 00 00 58 01 51
# 04 00 00 10
0 (OFF)

Ionisation current
# 07 00 00 00 73 02 04
# 05 00 FC EC 25
64748.00

Circulation pump for boiler layered
# 07 00 00 00 E0 01 38
# 04 00 00 10
0 (OFF)

Pumps UK
# 07 00 00 00 DF 01 46
# 04 00 00 10
0 (OFF)

The circulation pump
# 07 00 00 00 AF 01 A6
# 04 00 00 10
0 (OFF)

Pump heating boiler
# 07 00 00 00 01 9E C4
# 04 00 00 10
0 (OFF)

External heating pump
# 07 00 00 00 3F 01 9F
# 04 00 00 10
0 (OFF)

Built-in pump
# 07 00 00 00 44 01 69
0 (OFF)

Calc. temp an external regulator 7-8-9
# 07 00 00 00 25 02 A8
# 05 00 05 A0 82
90,00

Room thermostat
# 07 00 00 00 01 0E FD
# 04 00 00 10
0 (OFF)

The design temperature of the boiler
# 07 00 00 00 04 02 EA
# 05 00 00 F0 D8
15 degrees

The calculated flow temperature, the handle on the panel
# 07 00 00 00 19 02 D0
# 05 00 02 30 1C
35 degrees

The temperature of the boiler
# 07 00 00 00 17 03 CD
# 06 00 FF 21 AA 5F
-13.94 Degrees

The flow sensor HS
# 07 00 00 00 16 03 CF
# 06 00 FF 21 AA 5F
-13.94

Record the values ​​in the boiler:
The second byte is 0x80
The fifth byte - Register
Sixth byte - value
Seventh - CRC (checksum)

Example, set the value of the pump run - 31 minutes (value 0x1F)
Register 0x64
# 07 80 00 00 64 1F FF
If all goes well, the boiler will return the following sequence.
# 03 00 06