Peter Parry wrote:
On Sat, 11 Jul 2009 13:25:25 +0100, Clint Sharp
wrote:

IIRC the max length for RS-232 by the specs is about 15 metres.

The maximum specification cable length is 50 feet, or the cable length
equal to a capacitance of 2500 pF. It is the puffage rather than the
length which is critical so using a cable with low capacitance allows
you to span longer distances without going beyond the limitations of
the standard. Using CAT-5 cable with a typical capacitance of 17
pF/ft, the maximum allowed cable length is about 50m.

Somewhere in the garage I've some line drivers that will allow you to
go to about a km if you want.

Might be worth noting that most PCs etc have ports with drivers based on
the RS232C spec (lower voltage signalling) and not the full RS232 one.
So results will vary with different kit depending on its spec.



--
Cheers,

John.

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