> A friend told me he is always using his parallel port with a null modem for
> fast data transfer. Does somebody on the list know the layout for a parallel
> null modem?
If you want to build one rather than buy one, you need to wire the
cable as follows:
1 -- 1
2 -- 15
3 -- 13
4 -- 12
5 -- 10
6 -- 11
7,8,9 not used
10 -- 5
11 -- 6
12 -- 4
13 -- 3
14 not used
15 -- 2
16 -- 16
17 -- 17
18,19,20,21,22,23,24 not used
25 -- 25 (ground)
where, for example, 2 -- 15 means "solder a wire onto pin 2 of the first
connector, and solder the other end of the same wire to pin 15 of the
second connector".
Parallel cable has 25 coloured wires in it. The connectors usually have
very tiny numbers next to each pin (inside or outside). Any unused
wires should be cut or covered so that they cannot short-circuit
anything.
You should clearly label your masterpiece as a "parallel null-modem" so
that you don't embarrass yourself trying to use it for something else.
Maximum cable length is about two metres.
If each computer supports Enhanced Parallel Port (a hardware setting in
the BIOS) then activating this will improve transfer speed.
cheers,
Fraser Farrell
http://www.dove.net.au/~fraserf/
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