Ocean Optics External Triggering Options Instructions for Spectrometers with Firmware Version 3.0 and Above - Manual (Page 15)

External Triggering Instructions for FW 3.0 and Above
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USB Command Description for Triggering
The USB command Set Trigger Mode sets the spectrometer trigger to one of the trigger mode states as
shown below.
HR2000+ and USB2000+ 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  External Synchronization Trigger Mode
Data Value = 4  External Hardware Edge Trigger Mode