===== B5h 12h - Unknown Command =====

Date/Time:

^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 = 12h |Unknown command [ping ?] |  |  |  |  |  |
|M5 |NN = 02h |Length of data |  |  |  |  |  |
|M6 |xx |? |  |  |  |  |  |
|M7 |yy |? |  |  |  |  |  |
|M8 |CRC |  |  |  |  |  |  |
|S1 |ACK |  |  |  |  |  |  |
|S2 |NN = 00h |Length of data |  |  |  |  |  |
|S3 |CRC |  |  |  |  |  |  |
|M9 |ACK |  |  |  |  |  |  |
|M10 |SYN |  |  |  |  |  |  |

The following cases were observed:

  *

Heater Controller (Master 10h) → Firing Automat 1 (Slave 08h): \\ <font inherit/inherit;;inherit;;transparent>(xx = 00h, yy = 00h) hot water circulating pump is  ** off **</font>  \\ <font inherit/inherit;;inherit;;transparent>(xx = 00h, yy = 64h) hot water circulating pump is  ** on **</font>

  *

Firing Automat 1 (Master 03h) → Pump 1 (Slave 64h): \\ <font inherit/inherit;;inherit;;transparent>(xx = 02h, yy = 00h) internal pump is</font> **off** \\ (xx = 02h, yy = 64h) internal pump is **on**  and operating in the **service water circuit** \\ (xx = 02h, yy = FEh) internal pump is **on**  and operating in the **heating circuit** \\ (xx = 03h, yy = 00h) internal pump is **disabled due to error condition**  (such as water pressure too low)

  *

Firing Automat 1 (Master 03h) → PC/ Modem (Slave 05h): \\ (xx = 03h, yy = 00h)

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