Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uunet!aplcen!uakari.primate.wisc.edu!ames!henry.jpl.nasa.gov!elroy.jpl.nasa.gov!mahendo!jplgodo!seila!edison!don
From: don@edison.UUCP (Don Kossman)
Newsgroups: comp.sys.dec
Subject: Re: Decstation serial port <=> rs232(db25) connection
Summary: some info
Keywords: Decstation serial port
Message-ID: <297@edison.UUCP>
Date: 2 Dec 89 02:28:25 GMT
References: <804@lclark.UUCP>
Organization: SEI Information Technology, Whittier, CA
Lines: 40

In article <804@lclark.UUCP>, dan@lclark.UUCP (Dan Revel) writes:
> I would like to connect a modem or a terminal to the serial port on
> a Decstation 3100.  How does the RJ-11 jack map to an RS-232 (DB-25)
> pin configuration?

i'm trying to do the same thing on a vaxstation 3100, which
i assume has the same (strange) phone-like serial connectors.

what i've found out so far is that the connector is NOT an rj-11, since
the tab is offset from the centre.  DEC will sell you a cable with
such a connector on either side (they call this an MMP connector).
part number is BCE16E-xx where xx is 02, 10, 25 or 50.  this maps to
2, 10, 25 or 50 feet.  cost is 4$ to 15$.  i believe you can get this
via decdirect.

then you need an MMP to RS232 adaptor.  this is where i'm stuck,
since there are at least 6 and i don't know which is appropriate
for what.  DEC tech support hasn't been able to help, they wanted
to know which DEC modem or printer i wanted to connect... wouldn't 
talk to me about HP laserjets and hayes modems.

here is the info, such as it is, that i got from the DEC electronic store.

        H8571-A 31$     25-pin passive adapter
        H8571-B 26$     9-pin passive adapter
        H8571-C 21$     RS232 male adapter unfiltered
        H8571-D 30$     25-pin adapter - male
        H8571-E ???     male DTE 25-pin
        H8571-J $$$     9-pin serial printer

i have no idea what "passive", "unfiltered", etc. mean, but i
hope this helps.  perhaps someone who HAS connected a printer and/or
modem to a 3100 via the H8571 could have a look at the suffix and
enlighten us...

-- 
------
don kossman, sei information technology, los angeles
...sun.com!suntzu!seila!don
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