Vaillant

serial port on boiler

http://www.ab-log.ru/smart-house/heating-automation/vaillant-rs232

5V TTL level serial

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)

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