Date: Thu, 18 Feb 1999 16:51:36 +1100 (EST) From: "Daniel O'Callaghan" <danny@hilink.com.au> To: Dan Welch <WELCHDW@wofford.edu> Cc: HARDWARE@FreeBSD.ORG Subject: Re: heath gc1000 clock Message-ID: <Pine.BSF.3.96.990218164646.29436A-100000@enya.clari.net.au> In-Reply-To: <990217201337.20e18285@wofford.edu>
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On Wed, 17 Feb 1999, Dan Welch wrote: > This is a long shot. I have a Heath GC-1000 "Most Accurate Clock" in > excellent condition that I would like to try attaching to my FreeBSD > system as a time base. It's a short wave radio rcvr with RS232 > output that I cannot decode easily because I have misplaced the > manual. Anyone using, or ever used, one who knows the output signal > coding or can share FreeBSD code for using it? Thanks. I think you'll find xntpd supports it. /usr/src/usr.sbin/xntpd/xntpd/refclock_heath.c /* * refclock_heath - clock driver for Heath GC-1000 Most Accurate Clock */ #if defined(REFCLOCK) && defined(HEATH) #include <stdio.h> #include <ctype.h> #include <sys/time.h> #include <time.h> #include "ntpd.h" #include "ntp_io.h" #include "ntp_refclock.h" #include "ntp_stdlib.h" /* * This driver supports the Heath GC-1000 Most Accurate Clock, with * RS232C Output Accessory. This is a WWV/WWVH receiver somewhat less * robust than other supported receivers. Its claimed accuracy is 100 ms * when actually synchronized to the broadcast signal, but this doesn't * happen even most of the time, due to propagation conditions, ambient * noise sources, etc. When not synchronized, the accuracy is at the * whim of the internal clock oscillator, which can wander into the * sunset without warning. Since the indicated precision is 100 ms, * expect a host synchronized only to this thing to wander to and fro, * occasionally being rudely stepped when the offset exceeds the default * CLOCK_MAX of 128 ms. ...etc... To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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