From: "PCS Electronics"
Subject: Re: RS232 newbie - in need of assistance!
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Date: Fri, 3 Jan 2003 00:44:28 +0100
NNTP-Posting-Date: Fri, 03 Jan 2003 00:44:26 MET
Organization: Slovenija OnLine - SiOL
One more thing, are we doing your homework for you?
Marko - PCS Electronics
Turn your PC into a FM radio station
tel +386 31 318 236
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"John Fields" wrote in message news:firstname.lastname@example.org...
> On Thu, 2 Jan 2003 19:00:52 -0000, "Matt Foster"
> >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.
> If you're interested in doing it in hardware (CMOS or TTL, no µC)
> post a request here and I'll work something up for you and post it
> to alt.binaries.schematics.electronic. sometime this weekend. I'm
> thinking two HC165's and a single TTL-to-RS-232 converter to send
> the data into the PC's serial port, an HC191 to frame the word, a
> 7555 clock and maybe a little glue logic to hold it all together.
> Prob'ly 6 chips by the time it's all done, but it'll be standalone
> and you won't have to write any code to run it.
> John Fields
> Professional circuit designer