piclist 2001\09\10\052646a >
Thread: Simple RS232 hardware
www.piclist.com/techref/microchip/ios.htm?key=rs232
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face BY : mike@spam@@EraseMEwhitewing.co.uk



On Sun, 9 Sep 2001 10:56:46 -0400, you wrote:

{Quote hidden}

..so your special transceivers are integrated into PCs are they ? I
think you missed the point - I explicitly qualified my comment as
applying only to PCs, which will always use one of a few standard
transceiver chips, not any special 'high noise immunity' one, unless
you're working in a specialised market that uses unusual serial ports
on PCs, in which case you probably don't care about the cost of
transceivers.
I would have no argument whatsoever that if you want to talk to things
other than standard PCs you should use a 'proper' transceiver, but if
you know you're talking to a PC, it is an unnecessary expense.  
I've used PICs with resistors in several products, with many thousands
of units in the field over many years and have had not a single report
of a problem.

_Given the stated limitations_, I stand by my 'it works, period'
statement and would be interested to know of any transciever used in
production PCs that has been found not to work reliably from 5V
levels.
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