Xref: utzoo unix-pc.general:6322 comp.sys.att:10668
Path: utzoo!attcan!uunet!motcid!murphyn
From: murphyn@motcid.UUCP (Neal P. Murphy)
Newsgroups: unix-pc.general,comp.sys.att
Subject: Re: UPS/SPS testing re: AC protective ground
Message-ID: <4894@bone13.UUCP>
Date: 25 Oct 90 16:21:30 GMT
References: <35147@cup.portal.com> <1643@mitisft.Convergent.COM>
Organization: Motorola Inc., Cellular Infrastructure Div., Arlington Heights, IL
Lines: 14

dold@mitisft.Convergent.COM (Clarence Dold) writes:

>On other Convergent Systems designed in the 3B1 era, pin 1 was not a good
>place to attach the drain from the shield on an RS232 cable.

>The chassis and logic ground are separate, "stitched" together with a number
>of capacitors.  All of that shielding metal is to keep the zaps on the
>outside.

Quite true. But I though that pin 1 was chassis ground and pin 7 was logic
ground on RS232c. Granted, the little pin may not handle lots of current,
but it is supposed to be part of the shielding connection.

NPN