Subj : Re: Serial Port Interfacing...
To   : borland.public.cpp.borlandcpp
From : Jeff Baker
Date : Wed Jul 21 2004 01:58 pm

> can you maybe help to provide a link as to the Syntax that I must use to
connect to the COM port?

I sure can, I've written 3 RS-232 DOS applications that are still being sold
today. Your going to need to know detailed information about the device that
will be connecting to the laptop. Stuff like baud rate, stop/stop bits,
parity, asynchronous or synchronous communication, polling or interrupt
driven communication, data type that can be expected from the device (data
stream contents), basically all this (and a bit more) can be summed up with
one word..."Communication Protocol". You need to have it documented and
sitting in front of you when you start.

For a DOS project you'll be working with the functions inp() and outp() (or
outportb() and inportb()). These functions let you communicate directly
witht the RS-232 port registers. You could also use bioscom() and although
it's somewhat limited it is much more simple to use.

You should also have of copy of the PC's RS-232 register information in
front of you and, if you can afford it, a good break-out box.

As far as "Syntax" goes you need to answer all these question and provide me
with the details in order for me to provide more in-depth help.

- Jeff

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