RE: Re: CurrentCost serial cable wanted

[Stuart Poulton <stuart.poulton@xxxxxxxxxxxxxx>]

Of course, times have changed, and voltages have dropped.

>From RS232C (+/-12V) to TTL(5v) to TTL(3v).

Using

http://www.demarctech.com/techsupport/poecalculate.htm

A 3V signal will drop to 0.5v over 100 feet of cat5 cable, before an
connection losses are taken into account.

S

On Thu, 2009-03-05 at 10:03 +0000, Paul Gordon wrote:
> In years gone by, I used to patch serial connections over way longer
> distances than that... I used to run serial terminal connections to
> mainframe & Unix host machines over the length & breadth of a
6 storey
> building just by patching RS232 cables over the CAT5 structured
> cabling... It used to work just fine over hundreds of feet...




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