a printer oddity
Roy J. Tellason
rtellason at verizon.net
Fri Apr 11 16:04:12 CDT 2008
On Friday 11 April 2008 16:14, Mr Ian Primus wrote:
> --- "Roy J. Tellason" <rtellason at verizon.net> wrote:
> > First is that right next to the usual parallel connection there's another
> > connector, a DB25. That bit seems to be a little loose, and I'm
> > thinking plug-in board maybe?
> Yup. A lot of OkiData printers had their parallel ports on a plug in card,
> which in turn has a connector on it for a piggyback serial interface board.
> IIRC it's held in with some plastic clips.
The one I know most intimately is my old 92, which had such an arrangement.
You'd plug that board in and flip one DIPswitch in there someplace.
> > The other thing is that attached to that connector is a little adapter,
> > which has an RJ-45 socket on the back side of it. The plug side of it has
> > only a small number of the 25 pins actually installed. If I can figure
> > out a way to pop the shell open maybe I'll trace it out, otherwise I'll
> > probably take the ohmmeter approach. :-)
> That's pretty common as well for serial interfaces.
Probably got common after I stopped working on this stuff a lot. :-(
> Using these little RJ45 adapter dongles made serial cables much easier (and
> cheaper). Need null modem? Change the dongle. In-wall wiring was easier,
> with RJ45's at the wall. There isn't much of a standard wiring for these,
It figures. Somewhere buried in a box I have some other cables, RJ45 on one
end of a short (2-3 feet?) cable and a DB25 on the other, I think it was. I
never traced those out either.
> They were sold as "kits" with no pins inserted, and a prewired RJ45
> connector. You inserted the pins into the DB25 and clipped the thing
Some of those connector shells can be opened easier, some are pretty much
necessary to destroy to open it. If I can get it open, I also have the tool
to remove those pins, if necessary. :-)
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