The onboard 100 MHz oscillator automatically synchronizes to other network-synchronized chassis that are part of your local 802.1AS subnet.

The 80 MHz, 20 MHz, 100 kHz, 13.1072 MHz, 12.8 MHz, and 10 MHz Timebases are derived from this oscillator, and are synchronized to it. Therefore, they are also synchronized to other network-synchronized timebases on your 802.1AS subnet. This enables analog input, analog output, digital input, digital output, and counter/timers to be synchronized to other chassis across a distributed network.

The cDAQ-9189 chassis use the IEEE 802.1AS protocol over the network to synchronize. They can be configured to use the IEEE 1588-2008 protocol profile instead1 IEEE 1588 protocol is supported in NI-DAQmx 18.1 and later..

Note For chassis or networks that do not support network synchronization, the NI-9469 C Series synchronization module can be used to synchronize timebases and clocks across chassis.

More Information about Synchronization

The following documents will help you overcome typical hurdles in getting started with synchronized measurements:

  • How to synchronize analog input C Series modules with NI-DAQmx—This tutorial delves into multidevice and multichassis tasks. Visit ni.com/r/cdaqaisync.
  • Designing Ethernet measurement systems for synchronization, considering topologies, masters, and third party devices—If topology changes result in a device’s master changing, executing tasks may be affected. Visit ni.com/r/cdaqenet.
  • How to achieve high accuracy measurements—Visit ni.com/r/cdaqsync.
  • Choosing a CompactDAQ synchronization technology—Visit ni.com/r/cdaqsynctypes.
  • Synchronization accuracy explained—Visit ni.com/r/syncacc.
  • Synchronizing FieldDAQ and TSN-Enabled Ethernet cDAQ Chassis to a PXI System—Visit ni.com/r/fd1588.

1 IEEE 1588 protocol is supported in NI-DAQmx 18.1 and later.