3

Unix/Linux 网络时间协议版本3 Network Time Protocol Version 3 (NTP) distribution for Unix systems

From [e-mail] Sun Jun 16 03:33:11 1996
From: Glen Call <[e-mail]>
Date: Fri, 24 May 1996 11:19:11 -0500
To: [e-mail]
Subject: Re:  xntp 3.5 support for Motorola GPS
Cc: [e-mail]
X-Sun-Charset: US-ASCII


| Drivers aren't hard to build at all. Your contribution/modification
| of a driver would be much appreciated, if it isn't there already.

David -

I studied the NMEA driver, made a correction (2 pls, see below), and
was able to drive the Motorola Oncore GPS.  I would be happy to supply
the whole file if you wish.

$ diff OLDrefclock_nmea.c refclock_nmea.c
145c145
< 	gps_send(pp->io.fd,"$PMOTG,RMC,0000\n", peer);
---
> 	gps_send(pp->io.fd,"$PMOTG,RMC,0000*1D\r\n", peer);
353c353
< 	gps_send(pp->io.fd,"$PMOTG,RMC,0\n", peer);
---
> 	gps_send(pp->io.fd,"$PMOTG,RMC,0000*1D\r\n", peer);
$

BTW, I am wondering if the daemon has the ability to issue an alarm if a
reference clock drops out.  If not, I suppose my application could poll
using logic borrowed from "ntpq" or similar utility.  Suggestions would
be most welcome.

Best regards,
Glen

PS: Do you know of any implementations of SNTP available on the Web?


Glen Call           [e-mail]
Motorola Advanced Messaging Systems Division