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This seems to happen to the direct beam path andor an order of magnitude more often than the one on the VLS. Too recover from this when it happens do the following procedure:

1. Power off the camera
2. Power off the camera side of the extender
3. (NOTE: to do this I believe you have unplug the power supply, since the power supply just has a rocker switch which I think selects between standard-cooling/deep-cooling/camera-power?).  The only LED that gives any indication of power is a green one inside the power supply, visible if you put eye somewhere near the deep-cooling ("||") side of the rocker switch).
4. Power off the camera side of the extender
5. Unplug the server-side extender USB cable from daq-rix-andor-01. The DIR andor extender has the black USB cable (top USB port) and the VLS andor extender is the Unplug the server-side extender USB cable from daq-rix-andor-01. The DIR andor extender has the black USB cable (top USB port) and the VLS andor extender is the silver cable (bottom USB port).
6. Re-plug the server-side extender USB cable into daq-rix-andor-01.
7. Power on the camera side of the extender. You should see the link led turn on on the extender, and the host led blink slowly.
8. Power on the camera. The host led on the camera side extender show turn on solid now, and the activity led should blink intermittently.
9. Restart the IOC (the existing IOC process my be locked up and may need to be kill -9 to die) or alternatively just reboot daq-rix-andor-01.

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For camera communication errors ("Unknown" in EDM "Model Number" field) can look for "USB disconnect" error messages in /var/log/messages.  Can see device numbers with "lsusb | grep Andor" and compare to device numbers in /var/log/messages.  Here is an example with two cameras hooked up to one node:

daq-rix-andor-01:~$ lsusb | grep Andor
Bus 001 Device 071: ID 136e:0005 Andor Technology Ltd. 
Bus 001 Device 063: ID 136e:0005 Andor Technology Ltd. 
daq-rix-andor-01:~$ 

Workaround for RIX ANDOR-DIR hang

This is for when the camera is visible with "lsusb | grep Andor" (note uppercase "A") but the camera isn't communicating:

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