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From: papa@pollux.usc.edu (Marco Papa)
Newsgroups: comp.sys.amiga.tech
Subject: Re: DTR and serial.device - What about standardization?
Message-ID: <15125@oberon.USC.EDU>
Date: 2 Feb 89 17:12:14 GMT
References: <11543@gryphon.COM>
Sender: news@oberon.USC.EDU
Reply-To: papa@pollux.usc.edu (Marco Papa)
Organization: Felsina Software, Los Angeles, CA
Lines: 23

In article <11543@gryphon.COM> rickf@pnet02.cts.com (Rick Flower) writes:
|I'm currently relying on the fact that I CAN lower/raise the DTR line via the
|CIA that is connected to the Serial port that is standard in the
|500/1000/2000.. Is there a "Better" way to do the same thing that doesn't
|rely on the CIA or which port you might be using...?? Such as the "Default" or
|"built-in" or "1st extended" ports (as defined by Bryce Nesbit of C-A).. It
|would certainly be NICE to have a "pseudo" standardization... All I know is
|that if a modem is connected to ANY of these serial ports, it really does suck
|when the ONLY way to hang up the phone is by doing the "+++ <cr| ATH0 <cr|"
|junk!  Dropping the DTR is a much more effective way of doing things....

As Bryce suggested, a "better" way is to close the device, wait 1 sec and
then reopen it (with the SAME parameters).  I tried it and it works just
fine.  DTR is dropped properly.

Multi-serial manufacturers should ensure that this technique works on their 
hardware too.

-- Marco Papa 'Doc'
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