13
Control Interfaces
Trigger
Driving the TRIG pin (PIN 12) on the host interface connector low for over 10ms causes the EM3080-W to
start a scan and decode session. If a barcode is decoded, the EM3080-W waits for the voltage at the
TRIG pin to turn high (or the trigger to be released) after sending the data to the Host. If the trigger is
released during a scan attempt, the EM3080-W immediately stops decoding.
Next decode session does not happen until the EM3080-W receives active trigger signal (driving the TRIG
pin low) again.
As a decode session involves image capture, barcode decoding and other steps, it is suggested that the
minimum interval between triggers should exceed 50ms.
The following trigger circuit is provided for reference.
