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Is it possible to configure either my computer (running Ubuntu 17.10) or the labjack to work over the ethernet cable when plugged directly to my computer (i.e. no intervening router)?
I have often done this by using a static IP address for both the computer and the LabJack T7.
Most modern computers don't require a straight-through cable when using a direct connection and not using a router, so this should work fine for you.
Nick
Well put, Nick.
If it helps, here's a guide for connecting a LabJack device directly via Ethernet to the host computer:
https://labjack.com/support/app-notes/networking/direct-connection-ethernet-app-note
Comments and questions on the above link are appreciated.