Correct handle MSC command when AT#CMUXMODE=0

2 thoughts on “Correct handle MSC command when AT#CMUXMODE=0

  1. Hello!

    Examples have some mistakes about MSC command (Telit CMUX Implementation User Guide (Rev. 3) – 2013-02-15, page 26)

    // User Application sends the module the Virtual V.24

    F9 03 EF 09 E3 05 0B 05 FB F9

    //  Module answers with just receiver Virtual V.24

    F9 03 EF 09 E1 05 0B 05 9A F9  

    // Module sends  it’s Virtual V.24…

    F9 03 EF 09 E3 05 0B 4D 9A F9

    //  User Application answers with just receiver Virtual V.24

    F9 03 EF 09 E1 05 0B 4D FB F9

    FCS must be the same for this all frame. UIH data field not calculated.

    Also mistake in page 17:
    CMUXMODE = 0 or 4 
    DCE (Telit Module) sends the first message:
    … 
    DCE (Application) answers:
    … 
    1. Hi Dmitry,

      The FCS must not be the same in the reply since DLCI is different.

      This is a sample; error on APP NOTE is they wrote the same DLCI.

       

      11.40.18.72 [TX] – F9 03 EF 09 E3 05 07 0D FB F9
      11.40.18.74 [RX] – F9 01 EF 09 E1 05 07 0D 9A F9 

       

      What’s the error on pag 17?