Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!wuarchive!uunet!mtndew!friedl
From: friedl@mtndew.Tustin.CA.US (Stephen J. Friedl)
Newsgroups: comp.sys.att
Subject: Re: Mystery connectors...
Keywords: 3B2, connector, DB25, RJ45, DTR, ACU
Message-ID: <598@mtndew.Tustin.CA.US>
Date: 20 Dec 90 11:12:04 GMT
References: <957@gagme.chi.il.us> <1990Dec19.214231.25024@nmrdc1.nmrdc.nnmc.navy.mil>
Organization: VSI*FAX Tech Ctr, Tustin, CA
Lines: 25

[ in a real netnews mood this evening! ]

Bob Stratton writes:
> 
> What is the "DTR" connector? It looks like those mentioned above,
> and says "B46337541 DTR" with a lot # on the case.

EPORTS supports hardware flow control on its CTS and RTS lines,
but many devices (printers, usually) use DTR for their busy
line.  The DTR connector is like a terminal printer adaptor
except DTR is routed where RTS usually is and CD and DTR on
the 3B2 side are jumpered.  This means that you no longer get
hangup-on-power-off but you do get hardware flow control.

Better is to build a connector that routes some always-high
signal on the termianl into the CD input on the 3B2 -- I often
find (oddly enough) that RTS is available for this.o

    Steve

-- 
Stephen J. Friedl, KA8CMY  /  3B2-kind-of-guy  /  Tustin, CA / 3B2-kind-of-guy
+1 714 544 6561  / friedl@mtndew.Tustin.CA.US  / {uunet,attmail}!mtndew!friedl

Why not add Hollerith fields to printf()?