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From: strider@mtuxo.UUCP (M.COVINGTON)
Newsgroups: comp.dcom.modems
Subject: Re: RS-232C
Message-ID: <566@mtuxo.UUCP>
Date: Wed, 19-Aug-87 16:48:31 EDT
Article-I.D.: mtuxo.566
Posted: Wed Aug 19 16:48:31 1987
Date-Received: Sat, 22-Aug-87 04:50:06 EDT
References: <192@caeco.UUCP> <2849@phri.UUCP> <1102@gilsys.UUCP> <2853@phri.UUCP> <14000@topaz.rutgers.edu>
Organization: AT&T, Middletown NJ
Lines: 31

In article <14000@topaz.rutgers.edu>, ron@topaz.rutgers.edu (Ron Natalie) writes:
> >	RS-232C was published back in the days when half-duplex connections
> > were much more common.  The RTS/CTS lines are intended to be used to
> > negotiate line turn-around in a half-duplex connection.  When the the DTE
> 
> This is correct, it isn't just for half-duplex transmissions though.
> 
> Your definitions of DTR/DSR/RI/CD are a bit off.
.
.
> While carrier is detected CD is asserted.
> 
> Generally, the host should watch CD to see if the connection went
> away.  DSR going away means for some reason the modem itself gave
> up (like it was turned off).

True.  Also, generally the modem will not provide CTS unless it has detected
carrier and asserted CD.


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