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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 |xx<sub>1</sub>  \\  |  |  |  |  |  |unknown, always 00h |
|M7 |xx<sub>2</sub>  \\  |  |  |  |  |  |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 |xx<sub>3</sub>  \\  |  |  |  |  |  |unknown, always FFh |
|M11 |xx<sub>4</sub>  \\  |  |  |  |  |  |unknown, always FFh |
|M12 |xx<sub>5</sub> = 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 |xx<sub>6</sub>  \\  |  |  |  |  |  |unknown, always FFh |
|M14 |xx<sub>7</sub>  \\  |  |  |  |  |  |unknown, always 00h |
|M15 |CRC |  |  |  |  |  |  |
|S1 |ACK |  |  |  |  |  |  |
|S2 |NN = 01h |Length of data |  |  |  |  |  |
|S3 |zz = 01h |(acknowledge ?) |  |  |  |  |unknown |
|S4 |CRC |  |  |  |  |  |  |
|M16 |ACK |  |  |  |  |  |  |
|M17 |SYN |  |  |  |  |  |

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