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Communication with devices connected to serial com or parallel ports

Posted on 1998-09-01
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Last Modified: 2013-11-20
How can I communicte with devices connected to my PC serial
or pralllel ports when developing my application using MFC

Thanks and regards,
Neo
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Question by:essneo
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Accepted Solution

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chensu earned 150 total points
ID: 1321587
A process uses the CreateFile function to open a handle to a communications resource. For example, specifying COM1 opens a handle to a serial port, and LPT1 opens a handle to a parallel port.

There is full documentation in the Platform SDK.
Platform SDK\Windows Base Services\Files and I/O\Communications.
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by:essneo
ID: 1321588
Thanks for your answer.

But where can I find the full documentation.

Best regards,
Neo
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by:chensu
ID: 1321589
It should come with Visual C++. You may search for BuildCommDCB function first and click the Communications Overview link. If you want the latest one, you may install the Platform SDK Jan 1998 on the MSDN CDs. Or you can access the online documentation at http://msdn.microsoft.com/developer/, you need to register first.
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Expert Comment

by:warmcat
ID: 1321590
Ess-oh,

Communication with the serial ports is chensu suggests, and for output using centronics protocol, parallel ports can also be driven by CreateFile() as he says.

For docs on CreateFile, etc, see the help system that comes with Visual C++, or subscribe to MSDN for more data (see http://msdn.microsoft.com/developer/default.htm)

If your peripheral is using any other protocol than centronics nSTB -> nACK/BUSY or using the status lines to read back data, then you must take control of the parallel port yourself.  See http://warmcat.com/parallel for more information.

Regards,

-Andy
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