Ocean Optics External Triggering Options Instructions for Spectrometers with Firmware Version 3.0 and Above - Manual (Page 16)

External Triggering Options Instructions for FW 3.0 and Above
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USB4000 Set Trigger Mode
Data Value = 0  Normal (Free running) Mode
Data Value = 1  Software Trigger Mode
Data Value = 2  External Hardware Level Trigger Mode
Data Value = 3  Normal (Shutter) Mode
Data Value = 4  External Hardware Edge Trigger Mode
Maya2000Pro, QE65000, QE65 Pro, and QE Pro Set Trigger
Mode
Data Value = 0  Normal (Free running) Mode
Data Value = 1  External Hardware Level Trigger Mode
Data Value = 2  External Synchronous Trigger Mode*
Data Value = 3  External Hardware Edge Trigger Mode
*Not yet implemented on the QE Pro