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From: pitonyak@mostaccioli.cis.ohio-state.edu (Andrew Pitonyak)
Newsgroups: comp.terminals,comp.sys.zenith,comp.dcom.modems
Subject: Re: Duplex wackiness between a Hayes 2400 and a Z19
Keywords: hayes z19
Message-ID: <88382@tut.cis.ohio-state.edu>
Date: 13 Feb 91 23:14:13 GMT
References: <11051@pasteur.Berkeley.EDU>
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Reply-To: Andrew Pitonyak <pitonyak@cis.ohio-state.edu>
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Organization: Ohio State University Computer and Information Science
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Try giving the command

ATF1

To tell the modem not to echo a copy back to the screen.  It seems to me
that when you are getting two copies on the screen then both your modem
and the computer you are calling are echoing the characters.  When you
get three copies then the terminal is also echoing back a copy.  You
can control both your modem and your terminal :-)

If the command ATF1 has undesireable effects, then just undo it with
a ATF0

Note that you must be in command mode to do this.

Andy