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B5h 10h - Operational Data from Room Controller to Burner Control Unit

Master/ Slave Byte-No.	Abbrev.	Description	Unit	Range	Type/ [Res.]	Repl. Value	Note
M1	QQ	Source address
M2	ZZ	Target address
M3	PB = B5h	Vaillant command
M4	SB = 10h	Operational Data from Room Controller to Burner Control Unit
M5	NN = 09h	Length of data
M6	xx₁						unknown, always 00h
M7	xx₂						unknown, always 00h
M8	LT	Lead water target temperature (Vorlauftemperatur)	°C	0 – 100	DATA1c
M9	ST	Service water target temperature	°C	0 – 100	DATA1c
M10	xx₃						unknown, always FFh
M11	xx₄						unknown, always FFh
M12	xx₅ = 00h = 01h = 04h = 05h = 40h = 41h = 44h = 45h				Bits: 01 - if set, means to TURN OFF heating 04 - if set means to TURN OFF service water heating 40 - unknown?		combination of bit values. Each bit means to turn off specific feature, like service water heating. This is used by the room controller to stop the boler from heating (when the temperature is enough), or stop service water heating
M13	xx₆						unknown, always FFh
M14	xx₇						unknown, always 00h
M15	CRC
S1	ACK
S2	NN = 01h	Length of data
S3	zz = 01h	(acknowledge ?)					unknown
S4	CRC
M16	ACK
M17	SYN