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Configuring CompactRIO to Synchronize Clocks with NTP Servers


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In the presentation Bryan Heslop from Endigit will show you how to configure a National Instruments CompactRIO to work with NTP time servers.

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Configuring CompactRIO to Synchronize Clocks with NTP Servers

  1. 1. Configuring CompactRIO to Synchronize Clocks with NTP Servers Bryan Heslop Business Development Manager Systems Engineer Endigit
  2. 2. Agenda • Introduction to Endigit • What is NTP? • Easy cRIO NTP Config – Internet connection required • Less easy cRO NTP Config – No Internet on cRIO • Looking at NTP time information • Checking NTP time settings in LabVIEW
  3. 3. Endigit • Founded in 2011 • National Instruments Silver Alliance Partner • 5 Certified LabVIEW Architects • 1 Certified LabVIEW Embedded Developer • 2 National Instruments Certified Professional Instructors
  4. 4. What Endigit offers Services • LabVIEW Development • Data Acquisition Systems • Automated Test Consulting • Industrial and Embedded Control • Vision Systems Industries • Aerospace and Defense • Medical • Industrial Control • Consumer Electronics • Oil and Gas
  5. 5. Products IP Blaster is a utility for quickly and easily setting a static IP address on a Windows system. Endigit BACnet LabVIEW API SquareBattle is a game written in LabVIEW where you create your own team of squares to compete against other peoples teams in an arena. Endigit EMC Test Suite
  6. 6. What is NTP? • NTP is a protocol designed to synchronize the clocks of computers over a network to a common timebase (usually UTC). • There is a daemon that can run on Unix/Linux operating systems. Image Source:
  7. 7. Easy CompactRIO NTP Configuration • NI Real-time Linux CompactRIOs have configuration for the NTP daemon installed. • cRIO-906x, cRIO-903x devices • Connect cRIO to the Internet • Run command: opkg install ntp ntp-tickadj ntp-util ntpdate • Run opkg update • Edit /etc/ntp.conf file • Enter command vi /etc/ntp.conf • Add IP address for desired time server (default config file has official ntp servers already)
  8. 8. What if I can’t connect my cRIO to the Internet? • Download files from on PC and copy them over to cRIO • libevent • libperl • ntp • ntp-tickadj • ntp-utils • Perl • ntpdate • vfpv3/ •
  9. 9. No Internet manual install • Manually install each package in correct order of dependencies • opkg install libevent • opkg install ntp-tickadj • opkg install ntp • opkg install libperl • opkg install perl • opkg install ntp-utils • opkg install ntpdate
  10. 10. Edit /etc/ntp.conf • vi /etc/ntp.conf • Add your server • Server <ipaddress>
  11. 11. NTP commands and information • /etc/init.d/ntpd • daemon that runs to sync with server • /etc/init.d/ntpd stop • /etc/init.d/ntpd start • ntpdate -s <server> • Forces a synch to the server time • ntpq -p • Gets list of peers and shows status
  12. 12. What does all that stuff mean? • remote and refid: remote NTP server, and its NTP server • st: stratum of server • t: type of server (local, unicast, multicast, or broadcast) • poll: how frequently to query server (in seconds) • when: how long since last poll (in seconds) • reach: octal bitmask of success or failure of last 8 queries (left-shifted); • 377 = 11111111 = all recent queries were successful • 257 = 10101111 = 4 most recent were successful, 5 and 7 failed • delay: network round trip time (in milliseconds) • offset: difference between local clock and remote clock (in milliseconds) • jitter: difference of successive time values from server (high jitter could be due to an unstable clock or, more likely, poor network performance)
  13. 13. Can I get this information in LabVIEW?
  14. 14. Endigit contact information • Bryan Heslop – • 801-787-3111 • •