serial pinout 1550
dirkw at rentec.com
Fri Oct 5 10:30:00 CDT 2001
On Fri, 5 Oct 2001, Michael E Brown wrote:
> Thanks Glen! Very informative.
yes, agree!!! thx very much, glen!
> On Fri, 5 Oct 2001, Glen Turner wrote:
> > Dirk Wetter wrote:
> > >
> > > we bought a cyclades terminalserver (nice piece btw, running Linux ;)
> > > and we wanted to use that to get console access to the new 1550s
> > > we bought. we have trouble however finding docu about the DB9 pinout
> > > of the 1550. can anybody help me out ?
> > As Michael pointed out, the 2550 has a RS-232 port
> > with the same proprietary pinout as used on the
> > IBM PC/AT and its many, many successors.
yes, this is also what i figured by trial and error, but the 1550 is
different from the 2550 for some reason, at least i cannot use the same
using a xyplex/rocket port/cisco terminalserver i can use for the 2550
i can use the same home made connector as i am using e.g. for sparcs and
other PCs. with a 1550 i have to use a home made different connector to get
it working, the wiring is kind of strange, really.
using a cyclades and a 1550 however i found out yesterday that i can use
the standard connector as i am e.g. using for the 2550 and a cisco
> > The Cylades RJ45 connector is documented at
> > http://www.cyclades.com/solutions/techtalk/techtalk15.htm
> > There is no standard for RS-232 over RJ-45 structured
> > cabling, so each manufacturer uses differing pins.
yep! another great thing with the cyclades is the good documentation!
> > Based on that web page, you want a cable with the
> > pinout
> > Cyclades RJ45 IBM PC/AT
> > 4 SGnd -------------- SGnd 5
> > 3 TxD -------------- RxD 2
> > 6 RxD -------------- TxD 3
> > 1 RTS -------------- CTS 8
> > 5 CTS -------------- RTS 7
> > 2 DTR -----------+-- DCD 1
> > |
> > +-- DSR 6
> > 7 DCD --+----------- DTR 4
> > |
> > 8 DSR --+
> > Which is Cyclades part CAB0036. Alternatively, you
> > can get it manufactured by one of the many speciality
> > cabling businesses. Personally, I'd choose to make
> > my own, using a pin crimping tool, as cables made to
> > length give much better system reliability.
> > I'd strongly suggest using shielded cable, as one character
> > of line noise during boot can make the Dell 1550 BIOS
> > hang about forever (as it enters the BIOS settings
> > screen and waits for further keystrokes). I'm not sure
> > if the 2550 has the same bug.
i never experienced that. the only thing with the 1550 is that i had
to get a bios >A04 and disable the "serial" definition in
lilo.conf. have you tried standard cat5 cables and do the wiring in
the db9 or db25 connectors?
> > For more information on serial consoles see the draft of an updated
> > Remote-Serial-Console-HOWTO at
> > http://www.aarnet.edu.au/~gdt/serialconsole/Remote-Serial-Console-HOWTO/
great, thx for the work!
> > This is currently going through the process of being accepted by
> > the Linux Documentation Project and should be released in a few weeks.
> > Feedback on the HOWTO is welcomed, particularly before the release
> > of the document :-)
i think i might have something to contribute. ;-)
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