Moxa Technologies UC-7420/7410 user manual NTP Client, Updating the Time Automatically

UC-7420/7410 User’s ManualManaging Embedded Linux

192.168.3.127 – PuTTY

root@Moxa:~# date

Fri Jun 23 23:30:31 CST 2000 root@Moxa:~# hwclock

Fri Jun 23 23:30:35 2000 -0.557748 seconds root@Moxa:~# date 120910002004

Thu Dec 9 10:00:00 CST 2004 root@Moxa:~# hwclock –w root@Moxa:~# date ; hwclock Thu Dec 9 10:01:07 CST 2004

Thu Dec 9 10:01:08 2004 -0.933547 seconds root@Moxa:~#

NTP Client

UC-7420/7410 has a built-in NTP (Network Time Protocol) client that is used to initialize a time request to a remote NTP server. Use #ntpdate <this client utility> to update the system time.

#ntpdate time.stdtime.gov.tw #hwclock –w

Visit http://www.ntp.org for more information about NTP and NTP server addresses.

10.120.53.100 – PuTTY

root@Moxa:~# date ; hwclock Sat Jan 1 00:00:36 CST 2000

Sat Jan 1 00:00:37 2000 -0.772941 seconds root@Moxa:~# ntpdate time.stdtion.gov.tw

9 Dec 10:58:53 ntpdate[207]: step time server 220.130.158.52 offset 155905087.9 84256 sec

root@Moxa:~# hwclock -w root@Moxa:~# date ; hwclock Thu Dec 9 10:59:11 CST 2004

Thu Dec 9 10:59:12 2004 -0.844076 seconds root@Moxa:~#

NOTE Before using the NTP client utility, check your IP and DNS settings to make sure that an Internet connection is available. Refer to Chapter 2 for instructions on how to configure the Ethernet interface, and see Chapter 4 for DNS setting information.

Updating the Time Automatically

In this subsection we show how to use a shell script to update the time automatically.

Example shell script to update the system time periodically

#!/bin/sh

ntpdate time.nist.gov # You can use the time server’s ip address or domain

#name directly. If you use domain name, you must

#enable the domain client on the system by updating

#/etc/resolv.conf file.

hwclock –systohc

sleep 100 # Updates every 100 seconds. The min. time is 100 seconds. Change

# 100 to a larger number to update RTC less often.

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