Re: LZ: RS-232 & RS-422 Standards

Re: LZ: RS-232 & RS-422 Standards

• Subject: Re: LZ: RS-232 & RS-422 Standards
• From: C Kuethe <ckuethe@gpu.srv.ualberta.ca>
• Date: Wed, 2 Oct 1996 09:24:13 -0600 (MDT)
• In-Reply-To: <Pine.SGI.3.91.961002091256.28868E-100000@davinci.bergen.org>

On Wed, 2 Oct 1996, A.K.A. TheWiz wrote:


>   Can anyone point me in the right direction to find out more about the 
> RS-232 & RS-422 protocols?  I'm trying to connect the $4 link to my MAC, 
> and though I have found info from Apple on the Mac serial-port pinout, my 
> best efforts have turned up nothing on the actual protocol (Mac uses 
> RS-422 while PCs and most other systems use RS-232).
> 
>   Any help would be greatly appreciated.
>   Dan Knapp


Try one of the apple books.  I don't remeber the name, but it's about the
Mac Plus, SE/30, and II.  I think it's called the Apple Macintosh Family
Hardware Reference.  After all mac does use RS422, and rs422 is rs422 on
any mac.  that's why appletalk works.  it's a bit dated, but the info's
there.  If I were you, I'd go buy a $5 din8 -> DB25 serial cable.  It
kinda works (at least well enough to drive a modem).


<pre>
--
Chris Kuethe <ckuethe@gpu.srv.ualberta.ca> LPGV Electronics and Controls


RSA in 3 lines of PERL:
#!/bin/perl -sp0777i<X+d*lMLa^*lN%0]dsXx++lMlN/dsM0<j]dsj
$/=unpack('H*',$_);$_=`echo 16dio\U$k"SK$/SM$n\EsN0p[lN*1
lK[d2%Sa2/d0$^Ixp"|dc`;s/\W//g;$_=pack('H*',/((..)*)$/)
</pre>

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