Xref: utzoo comp.sys.amiga.tech:5797 comp.misc:6395
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!usc!apple!oliveb!tymix!antares!pnelson
From: pnelson@antares.UUCP (Phil Nelson)
Newsgroups: comp.sys.amiga.tech,comp.misc
Subject: Re: Serial Help
Summary: you can buy a switch, or make one
Message-ID: <468@antares.UUCP>
Date: 23 Jun 89 06:40:59 GMT
References: <637@bnr-fos.UUCP>
Reply-To: pnelson@antares.UUCP (Phil Nelson)
Organization: Tymnet QSATS, San Jose CA
Lines: 30

In article <637@bnr-fos.UUCP> protcoop@leibniz.uucp () writes:

>I now have two things that require connection to my serial port
>(modem and X10 controller) and this is a problem.  I would like to
>build a switch box so that I can connect both devices to it and
>JUST FLICK a switch to select one.  Unfortunately I do not really

Assuming I didn't just go out and buy a switch (they are sort of spendy),
I would use a 4-pole double-throw switch to switch TD (pin 2), RD (pin 3),
DSR (pin 6) and DTR (pin 20) connect pin 7 to both devices. In some cases
you can get by with a double pole double throw, simply omit the DSR and DTR,
connect DTR to DSR on any device that cannot be strapped to ignore them. I
like to have them though, I like my modem to hang up when I drop DTR, either
when I close the serial port, or Amiga gurus, or, in your case, when you
throw the switch and disconnect it.

>meant.  I would appreciate any input into this.  Thank you.

You're welcome, I hope it's not too redundant.

>----------------------------------------------------------
>Alan W. McKay  |  My opinions are mine, yours are yours. |  Eat Food  |
>NEPEAN, Ont.   |  I in no way pretend to represent the   |     and    |
>613-763-8980   |  the options of my employer.  So there. |   LIVE !!  |

-- 
Phil Nelson at (but not speaking for)                  OnTyme:NSC.P/Nelson
Tymnet, McDonnell Douglas Network Systems Company       Voice:408-922-7508
UUCP:{pyramid|ames}oliveb!tymix!pnelson              LRV:Component Station
"What we face is government troops and we have no guns."  -Chinese student