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Thread: XM Direct protocol, Need help with commands !!!

  1. #1
    Newbie
    Join Date
    Mar 2006
    Posts
    18

    XM Direct protocol, Need help with commands !!!

    I have been working on a project using the XM direct hardware. I have about %90 of the commands figured out. I am having trouble getting the channel change responses to work correctly. Here is some of the data that I have collected:

    Request form XM Direct:

    AA - channel
    XX - checksum
    command syntax 5A A5 00 06 10 02 AA 00 00 01 XX XX
    00 01 02 03 04 05 06 07 08 09 10 11
    1 5A A5 00 06 10 02 F7 00 00 01 ED ED
    2 5A A5 00 06 10 02 01 00 00 01 ED ED
    3 5A A5 00 06 10 02 82 00 00 01 ED ED
    4 5A A5 00 06 10 03 8F 00 00 01 ED ED
    5 5A A5 00 06 10 03 82 00 00 01 ED ED
    6 5A A5 00 06 10 03 82 00 00 01 ED ED
    7 5A A5 00 06 10 03 01 00 00 01 ED ED
    8 5A A5 00 06 10 04 01 00 00 01 ED ED
    9 5A A5 00 06 10 04 01 00 00 01 ED ED
    10 5A A5 00 06 10 04 82 00 00 01 ED ED
    11 5A A5 00 06 10 04 82 00 00 01 ED ED
    12 5A A5 00 06 10 04 8F 00 00 01 ED ED

    Answer from XM tuner :
    5A A5 00 06 90 XX XX XX XX XX
    00 01 02 03 04 05 06 07 08 09 10 11 channel requested
    1 5A A5 00 06 90 01 00 F5 F7 00 03 82 F7
    2 5A A5 00 06 90 01 00 01 01 00 01 98 01
    3 5A A5 00 06 90 01 00 82 82 00 02 9A 82
    4 5A A5 00 06 90 01 00 F5 F7 00 03 82 8F
    5 5A A5 00 06 90 01 00 9F 8F 00 02 C4 82
    6 5A A5 00 06 90 01 00 9F 8F 00 02 C4 82
    7 5A A5 00 06 90 01 00 82 82 00 02 9A 01
    8 5A A5 00 06 90 04 0E 00 00 00 01 A7 01
    9 5A A5 00 06 90 04 0E 00 00 00 01 A7 01
    10 5A A5 00 06 90 01 00 01 01 00 01 98 82
    11 5A A5 00 06 90 01 00 01 01 00 01 98 82 ˜
    12 5A A5 00 06 90 01 00 82 82 00 02 9A 8F


    If you notice the command request uses 1002, 1003, 1004 to do the same thing. I have been Unable to fill in the XX in the answer data. Can anyone help me with the algorithm? I can produce more data if needed.

  2. #2
    Newbie
    Join Date
    Mar 2006
    Posts
    18
    I guess that it didnt keep my formating

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