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NNTP-Posting-Date: Fri, 03 Jan 2003 13:05:55 -0600
From: firstname.lastname@example.org (John Fields)
Subject: Re: RS232 newbie - in need of assistance!
Date: Fri, 03 Jan 2003 18:59:20 GMT
Organization: Austin Instruments, Inc.
References: <email@example.com> <3E15B302.firstname.lastname@example.org>
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On Fri, 03 Jan 2003 15:57:27 GMT, Fred Bloggs
>You cannot send arbitrary binary 8-bit patterns over the RS-232, you
>should stick to the printable ASCII character codes.
That's just not true.
It may be efficaceous to use the printable codes, but there are no
limitations as to what 8 bit battern can be sent via RS-232
>Since you have only
>5 switches that would make it only 32 different characters.
5 _mutually_ eclusive switches can only give rise to 5 characters.
>thing to do would be to dedicate each switch to a fixed bit position,
>parallel load the total switch state into a shift register and shift
>through a RS-232 driver to the port at the required baud rate-this
>process repeating at a fixed scan rate like 100Hz.
>This can be done with
>a single low-cost in-circuit-programmable PLD from Lattice Semiconductor:
Didn't you read the OP's request? He wants to do it with
Professional circuit designer
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