Roy J. Tellason wrote:
On Monday 05 May 2008 15:55, Tony Duell wrote:
Must work over a distance longer than the RS232
spec allows (i.e. the
answer is probably not 'A long RS232 cable' :-)).
What does the spec say about length with regard to that? I was of the
impression that you could get by with lower baud rates if you were using
longer cables.
I used to run a ppp link to a neighbors apartment at 115200. It was
about a 100 foot long shielded serial cable. Half duplex transfers ran
great, running heavy transfers in both directions would get errors,
which ppp would nicely recover from.
My big motivation at the time (1989 or so) was access to his laser
printer. I used to dump 150dpi full page images over that link. It was
slow, but reliable.
I have no idea what "the spec allows" but a shielded cable can get you a
long ways. :)
--
Tim Riker -
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