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Acquisition Control AW00118501000

52 Basler racer Camera Link

6.1.5 Using a Hardware Line Start Trigger Signal

6.1.5.1 Introduction

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

is set to CC1, CC2, CC3, or CC4, an externally generated electrical signal injected into the selected

source will act as the line start trigger signal for the camera. This type of trigger signal is generally

referred to as a hardware trigger signal or as an external line start trigger signal (ExLSTrig signal).

A rising edge or a falling edge of the ExLSTrig signal can be used to trigger line acquisition. The

Trigger Activation parameter is used to select rising edge or falling edge triggering.

Assuming that the camera is in a "waiting for line start trigger" acquisition status, line acquisition will

start when the hardware line 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 line start trigger" acquisition status because at that point, it cannot react to a new line start trigger

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

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

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

will determine the rate at which the camera will acquire lines:

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

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

If you have selected CC1, CC2, CC3, or CC4 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 ExLSTrig signal to CC1, CC2, CC3, or CC4, see the documentation for your

frame grabber.

If you are triggering line acquisition with an ExLSTrig signal and you attempt to

acquire lines at too high a rate, some of the line trigger signals that you apply will

be received by the camera when it is not in a "waiting for line start trigger"

acquisition status. The camera will ignore any line start trigger signals that it

receives when it is not "waiting for line start trigger". (This situation is commonly

referred to as "overtriggering" the camera.

To avoid overtriggering, you should not attempt to acquire lines at a rate that

exceeds the maximum allowed with the current camera settings.

ExLSTrig period in seconds

------------------------------------------------------------------------- Line Rate=

0.020

---------------50 lps=

1 2 ... 55 56 57 58 59 60 61 62 63 64 65 ... 129 130

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Basler A400K Manual de usuario Pagina 60