15
Trigger
Driving the
TRIG
pin (PIN 12) on the host interface connector low for over 10ms causes the EM1395 to
start a scan and decode session. If barcode is decoded, the EM1395 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 EM1395 immediately stops decoding.
Next decode session does not happen until the EM1395 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 two triggers should exceed 50ms.
The following trigger circuit is provided for reference.
