Using An External Trigger Signal - GigE VA Series User Manual

VA GigE series
8.3.3

Using an External Trigger Signal

If the Trigger Mode parameter is set to On and the Trigger Source parameter is set to External, an externally
generated electrical signal injected into the Control Receptacle pin 1 will act as the exposure start trigger signal
for the camera. This type of trigger signal is generally referred to as a hardware trigger signal.
A rising edge or a falling edge of the external signal can be used to trigger frame acquisition. The Trigger
Activation parameter is used to select rising edge or falling edge triggering.
Assuming that the camera is in a waiting for exposure start trigger acquisition status, frame acquisition will start
whenever the appropriate edge transition is received by the camera.
When the camera receives an external trigger signal and begins exposure, it will exit the waiting for exposure
start trigger acquisition status because at that point, it cannot react to a new exposure start trigger signal. As
soon as the camera is capable of reacting to a new exposure start trigger signal, it will automatically return to the
waiting for exposure start trigger acquisition status.
When the camera is operating under control of an external signal, the period of the external trigger signal will
determine the rate at which the camera is acquiring frames:
For example, if you are operating a camera with an External trigger signal period of 500 ㎳ (0.5 s):
So in this case, the frame rate is 2 fps.
31 of 94 RA14-131-003