Ethernet cDAQ Chassis Disconnects or Loses Connection While Acquiring Data

Updated Feb 11, 2022

Reported In


  • cDAQ-9181
  • cDAQ-9184
  • cDAQ-9188
  • cDAQ-9191
  • cDAQ-9185
  • cDAQ-9189

Issue Details

I ​can successfully acquire data from my ethernet based CompactDAQ chassis. However when I leave it running for a while it disconnects from the computer, my chassis or modules disappear from MAX, or I experience other intermittent connectivity issues. There are no problems with my code and my computer is properly connected to the network. How can I resolve this?


Complete the following troubleshooting steps to determine why your ethernet based cDAQ chassis is losing connection during data acquisition:

  1. Ensure another device on the network is not using the same IP address as your device. This can cause your device to be removed from the network and lose communication.
  2. You must reserve the communication if you use your device with an Ethernet protocol. To programmatically reserve, please follow this link: How Do I Reserve an Ethernet Based cDAQ Chassis from LabVIEW?
  3. Confirm that there are no problems with your chassis such as a flashing LED. If so, refer to your device's manual to determine the meaning of the flashing LED.
  4. If you can see the chassis but the modules show as Disconnected, perform a device reset of the chassis in NI MAX.
  5. Replace the ethernet and power cable.
  6. Losing a connection with your chassis can also happen as a result of your Windows settings. When leaving the code to run without any other interactions with the PC, Windows will try to save power by slowing down/disabling the network adapters. You can disable this feature by navigating to Device Manager» Network adapters. Expand this section to reveal your network devices, right-click on the correct card, and choose Properties from the drop-down menu.
    • Windows 7: In the Power Management tab you will need to uncheck Allow the computer to turn off this device to save power. You can change some of your network power settings through the control panel too.
  • Windows 10: In the Advanced tab, look for the Idle Power Saving property and set it to Disabled.