86 Vuquest 3320g User Guide
External Trigger Polarity
External Trigger Polarity has two states, High and Low.  A digital high polarity is 1 
and a digital low polarity is 0.  If the third party device triggers on low polarity, 0, 
scan the External Trigger Polarity Low bar code.  Default = External Trigger Polarity 
High.
* External Trigger Polarity High
External Trigger Polarity Low