10 Dec
2008
10 Dec
'08
9:26 a.m.
Andrew writes:
A little while ago I bought a "new" 10ft MMJ
cable from That Website.
Today I came to use it and discovered it was a crossover cable.
All MMJ cables are supposed to be crossover cables.
If you are using DB-9 or DB-25 adapters on the ends of the MMJ's, then
they have to be appropriate to the wiring for the device. Examples:
Rdy Out TX+ TX- RX- RX+ Rdy In
Adaptor Gender 1 2 3 4 5 6 Use with:
--------------------------------------------------------------------------
H8575-A F 20 2 7 7 3 6&8 VTxxx terminal
H8571-C M 6 3 7 7 2 20 Digital printer
H8571-D M 6 3 7 7 2 20 Modem
H8571-E M 20 2 7 7 3 6&8 Female terminal
or LaserWriter
--------------------------------------------------------------------------
If you've got the wrong adapter, you may be able to open it up and
swap around pins 2&3, 6&20. Some are shells you can open up and use
the DB-pin-remover tools to swap things around, others are molded solid
and you can't take them apart so easily.
MMJ was a nice concept for serial cables.
Tim.