output to serial port

This is a discussion on output to serial port within the C++ Programming forums, part of the General Programming Boards category; from what i understand it is possible to send signals to various pins of a serial port. is this, true, ...

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    output to serial port

    from what i understand it is possible to send signals to various pins of a serial port. is this, true, and either way is it possible to send output to the serial port(or other ports) at all? how? what .h files are required? i have absolutely no idea where to start here so help w/ a code snippet would be excellent. thanks a ton.

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    Depends on your OS. It's always possible, but you generally need to use an OS specific call. You'd need the WinAPI if you plan to do this in Windows -- making this a Windows programming question.

    There is no cross-platform way to do this.

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    I don't think you can use the WinAPI for this kind of stuff. You'll have to learn the WinDDK (Driver Developement Kit). I looked in to programming Windows NT device drivers, and it looks like the most difficult thing ever. Hmm...What kind of data are you trying to send?
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    i just need to produce a current in one of the pins. being able to do hi/lo would be nice, but ill take what i can get.

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    Originally posted by khan
    i just need to produce a current in one of the pins. being able to do hi/lo would be nice, but ill take what i can get.
    I did this once by sending a ^G (bell character - Control G) to com2.... provided me with a negative voltage on the TX pin to operate a cash drawer out of a dos-based POS program

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