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Moxa KM-2430-T [24/52] Ntp server setting
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ioPAC RTU Software RTU Management
3-10
NTP Server Setting
The ioPAC RTU controller has an NTP server setting. First, configure the time sync server at the path
/etc/ntp.conf and use the /etc/init.d/ntpd start command to start the NTP server.
root@Moxa:/etc# /etc/init.d/ntpd start
Starting ntp server
Use the ntpq -pn command to check the NTP server status, and ntpd –g –l /etc/ntp_log & to debug the NTP
server.
NOTE
ntpd
and ntpdate cannot be used at the same time because the UDP port 123 will be occupied.
Remember to use
hwclock-w to update the RTC time, or else the time sync settings will be lost after you
restart the device
.
Executing Scheduled Commands with Cron
Daemon
Start cron from the /etc/rc.d/rc.local directory. It will return immediately, so you don’t need to start it with
‘&’ to run in the background.
The Cron daemon will search /etc/cron.d/crontab for crontab files, which are named after accounts in
/etc/passwd.
Cron wakes up every minute, and checks each command to see if it should be run that minute. Modify the file
/etc/cron.d/crontab to set up your scheduled applications. Crontab files have the following format:
mm h dom mon dow user command
min hour date month week user command
0-59
0-23
1-31
1-12
0-6 (0 is Sunday)
The following example demonstrates how to use cron.
How to use cron to update the system time and RTC time every day at 8:00
Step 1: Write a shell script named fixtime.sh and save it to /home/.
#!/bin/sh
ntpdate time.nist.gov
hwclock –w
exit 0
Step 2: Change the fixtime.sh mode.
#chmod 755 fixtime.sh
Step 3: Modify the /etc/cron.d/crontab file to run fixtime.sh at 8:00 every day.
Add the following line to the end of crontab:
* 8 * * * root/home/fixtime.sh
Step 4: Enable the cron daemon manually.
#/etc/init.d/crond start
Step 5: Enable cron when the system boots up.
Add the following line in the /etc/rc.d/rc.local file
#/etc/init.d/crond start
Содержание
- First edition july 2013 1
- Iopac rtu software user s manual 1
- Www moxa com product 1
- Copyright notice 2
- Disclaimer 2
- Iopac rtu software user s manual 2
- Technical support contact information 2
- Trademarks 2
- Www moxa com support 2
- Table of contents 3
- Introduction 5
- Iopac rtu software introduction 6
- Overview 6
- Related documents 6
- Software architecture 6
- Supported products 6
- Iopac rtu software introduction 7
- Journaling flash file system jffs2 7
- Iopac rtu software introduction 8
- Software package 8
- Getting started 9
- Configuring the ethernet interface 10
- Developing the first program 10
- Development procedure 10
- Hardware and software requirements 10
- Iopac rtu software getting started 10
- Modifying network settings with the serial console 10
- Connect an rtu to a linux pc 11
- Iopac rtu software getting started 11
- Modifying network settings over the network 11
- Develop code compile the program 12
- Install the toolchain onto the pc 12
- Iopac rtu software getting started 12
- Root localhost cd tmp example hello_world root localhost tmp example hello_world make 12
- Root localhost cd tmp root localhost tmp mkdir example root localhost tmp cp r mnt cdrom software sample hello_world tmp example 12
- Root localhost mount dev cdrom mnt cdrom root localhost sh mnt cdrom software toolchain arm linux_vx x sh 12
- Root localhost path usr local arm linux bin path 12
- Root localhost telnet 192 68 27 54 12
- Root localhost telnet 192 68 27 54 trying 192 68 27 54 connected to 192 68 27 54 escape character is moxa login 12
- Set cross compiler glibc environment variables 12
- Iopac rtu software getting started 13
- Put hello_world 13
- Root localhost telnet 192 68 27 54 13
- Root localhost tmp example hello_world ftp 192 68 27 54 13
- Root localhost tmp example hello_world make usr local arm linux bin arm linux gcc i usr local arm linux include i usr local arm linux include rtu o hello_world hello_world o l usr local arm linux lib lpthread lmxml l usr local arm linux lib rtu lmoxa_rtu lrtu_common ltag wl rpath lib rtu wl allow shlib undefined 13
- Root moxa df h 13
- Root moxa home chmod x hello_world root moxa home hello_world 13
- Upload run the program 13
- Rtu management 15
- Attention 16
- Firmware upgrade and default settings 16
- Iopac rtu software rtu management 16
- System information 16
- Upgrading the firmware 16
- Iopac rtu software rtu management 17
- Iopac rtu software rtu management 18
- Recovering the firmware 18
- Enabling and disabling daemons 19
- Iopac rtu software rtu management 19
- Loading factory defaults 19
- Iopac rtu software rtu management 20
- Iopac rtu software rtu management 21
- Run level settings 21
- Iopac rtu software rtu management 22
- Setting the time manually 22
- System time setting 22
- Iopac rtu software rtu management 23
- Updating the time automatically 23
- Updating the time with ntp client 23
- Executing scheduled commands with cron daemon 24
- Iopac rtu software rtu management 24
- Ntp server setting 24
- Iopac rtu software rtu management 25
- Software lock 25
- Rtu communications 26
- Disabling the telnet ftp server 27
- Enabling the telnet ftp server 27
- Internet configuration 27
- Iopac rtu software rtu communications 27
- Modbus tcp master and slave 27
- Telnet ftp 27
- Iopac rtu software rtu communications 28
- Iptables 28
- Iopac rtu software rtu communications 29
- Examples 30
- Iopac rtu software rtu communications 30
- Observe and erase chain rules 30
- Append or delete rules 31
- Define policy for chain rules 31
- Examples 31
- Iopac rtu software rtu communications 31
- Iopac rtu software rtu communications 32
- Nat snat 32
- Enabling nat at bootup 33
- Iopac rtu software rtu communications 33
- Iopac rtu software rtu communications 34
- Port forwarding dnat 34
- Ppp dial up service 34
- Example 1 connecting to a ppp server over a simple dial up connection 35
- Iopac rtu software rtu communications 35
- Example 2 connecting to a ppp server over a hard wired link 36
- How to check the connection 36
- Iopac rtu software rtu communications 36
- Iopac rtu software rtu communications 37
- Setting up a machine for incoming ppp connections 37
- Iopac rtu software rtu communications 38
- Example 39
- Iopac rtu software rtu communications 39
- Nfs network file system client 39
- Openvpn 39
- Sending mail 39
- Setting up the iopac rtu controller as an nfs client 39
- Iopac rtu software rtu communications 40
- Setup 1 ethernet bridging for private networks on different subnets 40
- Iopac rtu software rtu communications 41
- Setup 2 ethernet bridging for private networks on the same subnet 41
- Iopac rtu software rtu communications 42
- Setup 3 routed ip 42
- Iopac rtu software rtu communications 43
- Ntp server client 43
- Iopac rtu software rtu communications 44
- Modbus rtu master 44
- Port trunking 44
- Serial configuration 44
- Rtu data acquisition 45
- Active opc server 46
- Battery backup sram 46
- I o data access 46
- Iopac rtu software rtu data acquisition 46
- Millisecond timestamp 46
- Rtu programming 47
- Iopac rtu software rtu programming 48
- Linux toolchain 48
- Memory usage 48
- Programming guide 48
- Steps for installing the linux toolchain 48
- Using c c 48
- Compilation for applications 49
- Iopac rtu software rtu programming 49
- Iopac rtu software rtu programming 50
- Library and apis 50
- On line debugging with gdb 50
- A system commands 51
- Editor 51
- File manager 51
- System commands 51
- Iopac rtu software system commands 52
- Moxa special utilities 52
- Network 52
- Process 52
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