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Thread: XTL BUS data format, OP codes etc... anyone have any info?

  1. #1
    PRC148 No Longer Registered

    Default XTL BUS data format, OP codes etc... anyone have any info?

    I have an RS485 to 232 hooked up to an XTL 2500 to sniff the SBU9600 display activity. This is a snippet of what I'm seeing:

    {00}{12}{05}{06}9{1F}{00}"€{0E}{0E}{00}{00}NE4------------{00}{00}{00}{00}{00}{00}{00}{00}{00}{00}{00}{00}{0 0}{00}
    {00}{12}{05}{06}9{1F}{00}"€{0E}{0E}{01}{00}NE4-PSAP-----{00}{00}{00}{00}{00}{00}{00}{00}{00}{00}{00}{00}{0 0}{00}9

    My serial program inserts the {} to denote HEX so ignore that.

    I assume there are some OP codes and icon flags there. Only the main text such as zone and channel info are sent in ASCII. I don't see anything that relates to the buttons directly so I assume the buttons must be mapped in some way, either directly to one of the hex codes or further bit wise derived. The u and 9 are probably checksums. The --- were put in to hold the formatting. It's actually just blank space, ASCII hex 0x20.

    Is this info floating around anywhere that I'm not aware of?


  2. #2
    PRC148 No Longer Registered

    Default

    OK maybe you guys can help me find the "salt" of this checksum then.

    I'm not seeing how they are coming up with the last byte values.

    05 02 04 57 18
    05 02 06 57 CA
    05 02 08 57 55
    05 02 0A 57 87