internal modem baudrate

This is a discussion on internal modem baudrate within the Windows Programming forums, part of the Platform Specific Boards category; Hi, My program has to connect an external device through a modem at a fixed baudrate of 9600 bps. When ...

  1. #1
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    internal modem baudrate

    Hi,

    My program has to connect an external device through a modem at a fixed baudrate of 9600 bps.
    When I connect an external modem to the COM port, everything
    works OK.
    When I want to use the internal modem of the PC, it always
    connects to "28800 V42bis" instead of 9600 bps.
    It looks like somewhere the dcb settings are ignored or
    overruled when SetCommState() has been called.

    What am I overlooking ?

  2. #2
    Registered User Codeplug's Avatar
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    The DCB settings will control your COM connection to the modem, not the modem's connection to another modem.
    You control the modem using AT commands.

    gg

  3. #3
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    This I understand.
    I assume an internal modem should oprate in the same way as an external modem.
    Both are connected to a COM port.
    Why does the internal modem connect to a different speed and thus the receiving modem connects to the device attached to it at a wrong speed ?

  4. #4
    Registered User Codeplug's Avatar
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    Look up the AT commands supported by that modem and ensure you are giving it the right commands for connecting at a particular baud rate.

    gg

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