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One of the most common reasons why the S800 DAQ fails to start is because the CCUSB and/or VMUSB are claimed by existing programs. This is shown by the error messages displayed by the system. If you find yourself in this situation try the following:
ps aux | grep Readout
kill -9 PID, where PID identifies any CCUSBReadout or VMUSBReadout processes that show up
kill -9 PID, where PID identifies any tclsh ReadoutShell process that might show up
godaqto see if this works now