Moxa Technologies 331 User Manual download pdf (Page 32)

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101

UC-7112-LX Plus Software User’s Manual Managing Embedded Linux

3-9

NTP Client

The UC-7112-LX Plus 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.

Save the shell script using any file name. E.g.,

fixtime

How to run the shell script automatically when the kernel boots up

Copy the example shell script

fixtime

to directory

/etc/init.d

, and then use

chmod 755 fixtime

to change the shell script mode. Next, use vi editor to edit the file

/etc/inittab

Add the following line to the bottom of the file:

ntp : 2345 : respawn : /etc/init.d/fixtime

Use the command

#init q

to re-init the kernel.

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