From owner-freebsd-questions Thu Jul 3 00:10:31 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id AAA25248 for questions-outgoing; Thu, 3 Jul 1997 00:10:31 -0700 (PDT) Received: from obie.softweyr.ml.org ([199.104.124.49]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id AAA25241 for ; Thu, 3 Jul 1997 00:10:26 -0700 (PDT) Received: (from wes@localhost) by obie.softweyr.ml.org (8.7.5/8.6.12) id BAA04660; Thu, 3 Jul 1997 01:16:33 -0600 (MDT) Date: Thu, 3 Jul 1997 01:16:33 -0600 (MDT) Message-Id: <199707030716.BAA04660@obie.softweyr.ml.org> From: Wes Peters To: "Andrew K. Adams" CC: questions@freebsd.org Subject: TrueTime GPS... In-Reply-To: <199707020030.UAA05757@wraith.psc.edu> References: <199707020030.UAA05757@wraith.psc.edu> Sender: owner-questions@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Andrew K. Adams writes: > I would like to attach a GPS to a FreeBSD box (for network > synchronization) and would be very appreciative of any information > anyone can offer. I am currently looking at a model manufactured by > TrueTime (XL-DC 600), since it (and my PC) is rack-mountable and it > provides a serial port for communication -- I am unsure if the latter > is useful with FreeBSD. Chances are pretty good it is a NMEA-0183 port, which uses RS-422 signalling levels. You should be able to plug it into a PC serial port, unless you have really bad hardware. You'll have to contact the manufacturer for information on the protocol they use. There is *some* standardization in this area, but I wouldn't count on your software working with it. Most manufacturers are pretty good about releasing protocol specs, though I've never heard of TrueTime. (I'm known as Barnacle Wes in another, *much* slower dimension. ;^) -- "Where am I, and what am I doing in this handbasket?" Wes Peters Softweyr LLC http://www.xmission.com/~softweyr softweyr@xmission.com