© National Instruments | 7-3
cDAQ-9185/9189 User Manual
Synchronization across a Network
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-9185/9189 chassis use the IEEE 802.1AS protocol over the network to synchronize.
These cDAQ chassis can not synchronize over the network with devices that use protocols or
IEEE 1588 profiles other than IEEE 802.1AS.
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—Visit
ni.com/info and enter 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/info and enter
cdaqenet.
• How to achieve high accuracy measurements—Visit
ni.com/info and enter
cdaqsync.
• Choosing a CompactDAQ synchronization technology—Visit
ni.com/info and enter
cdaqsynctypes.
• Synchronization accuracy explained—Visit ni.com/info and enter syncacc.
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