Switch Has Unusable Ports After Connecting Ethernet cDAQ

Updated Mar 15, 2019

Reported In


  • cDAQ-9189
  • cDAQ-9185

Issue Details

After connecting a dual port Ethernet cDAQ (such as the cDAQ-9189 or cDAQ-9185) chassis to my network switch, the port appears to be unusable, it can be either blocked or damaged after the connection. There are other devices working correctly while connected to it, and those ports were working properly before the connection.


The cDAQ-9189 chassis has 2 Ethernet ports and can be connected in daisy-chain, as you can see in Chapter 2 of the User's Manual. It also states that the cDAQ-9189 has an internal Ethernet switch. The reason why the ports are being blocked may be because the network switch is configured to do this when unmanaged switches are connected to it, and for the characteristics mentioned before, it is considering the 9189 as one of these. To fix this, you need to contact your IT department so they can get the connection working, by giving permissions for this device to be connected, or any action they need to take in order to enable a port for that connection.

Additionally, your network switch may be configured to block unexpected switches. If this is the case, talk to your IT department as you will need to edit the configuration file for your network switch to accept/allow the cDAQ. 
The necessary commands for this will be available in the user manual for your network switch and may vary for different switches. 

Additional Information

As this issue is caused by the network switch not allowing the unmanaged switch in the cDAQ, the cDAQ will work fine when directly connected to a PC or laptop. 


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