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Subject: Re: RS232 newbie - in need of assistance!
Date: Thu, 2 Jan 2003 16:32:37 -0500
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
I would try and use the parallel port. RS232 is annoying in two ways. It
uses > (+5V) for high and < (-5V) for low. (Though in really cheap designs
you could get away with 5V high and 0V low.) The second problem with RS232
(actually not RS232 here but rather UART) is the protocol. It uses a serial
data stream. That wouldn't be so bad, if it weren't for the lack of a clock
(as in each end has to know the right speed to read the data stream). In any
case, there are a small number of general purpose IO (I guess you could call
them that) that sends/receives status information. You could take those
lines and possibly divert them for your own purposes! (PonyProg programmer
dongle uses this, as it is pretty darn cheap and effective.)
"Matt Foster" wrote in message
> I am an A-Level student looking to read computer science at university in
> the coming years.
> As a project I am trying to design a circuit that transmits data to the 9
> pin serial port (RS232) of a standard PC.
> As a basic start I am trying to make a circuit with 4 ptm switches, when I
> press switch 1 I would like to display "switch 1" or somesuch on the
> computer screen. The same for switch 2,3 and 4.
> I will be using VB and the MSCOMM control to access the serial port, and I
> forsee no problems with doing this. My hurdle, however, is sending the
> 'data' from the PCB to the serial port.
> I would be extremely appreciative of any help you could give me.
> Thank you very much for your time.
> Matt Foster
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