User`s manual

Image Acquisition Control AW00098504000

86 Basler ace Camera Link

7.3.3 Using a Hardware Frame Start Trigger Signal

7.3.3.1 Introduction

If the Trigger Mode parameter for the frame start trigger is set to on and the Trigger Source

parameter is set to line 1, CC1, CC2, or CC3, an externally generated electrical signal injected into

the selected source will act as the frame start trigger signal for the camera. This type of trigger signal

is generally referred to as a hardware trigger signal or as an external frame start trigger signal

(ExFSTrig signal).

If the Trigger Source is set to line 1, the GPIO line must be properly set to operate as an input in

order to accept the trigger signal.

A rising edge or a falling edge of the ExFSTrig 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 frame start trigger" acquisition status, frame

acquisition will start when the hardware frame start trigger signal is received by the camera.

When the camera receives a hardware trigger signal and begins exposure, it will exit the "waiting

for frame start trigger" acquisition status because at that point, it cannot react to a new frame start

trigger signal. As soon as the camera is capable of reacting to a new frame start trigger signal, it

will automatically return to the "waiting for frame start trigger" acquisition status.

When the camera is operating under control of an ExFSTrig signal, the period of the ExFSTrig

signal will determine the rate at which the camera will acquire frames:

For example, if you are operating a camera with an ExFSTrig signal period of 20 ms (0.020 s):

So in this case, the frame rate is 50 fps.

If you have selected CC1, CC2, or CC3 as the trigger source, your frame grabber will typically apply

the electrical signal to the selected input via the Camera Link cable. For more information about

applying an ExFSTrig signal to CC1, CC2, or CC3, see the documentation for your frame grabber.

If you have selected line 1 as the trigger source, some other kind of external electrical device will

be used to apply the electrical signal to the selected input.

ExFSTrig period in seconds

------------------------------------------------------------------------- F r a m e R a t e=

0.020

--------------- 50 fps=