Basler SCOUT LIGHT User Manual download pdf (Page 57)

Image Acquisition Control

Basler scout light 49

For more information about the pylon Viewer, see Section 3.1 on page 17.

For more information about the Trigger Ready signal, see Section 6.7 on page 57.

For more information about the camera’s exposure time parameter, see Section 6.4 on page 51.

6.3.4 Acquiring Images by Applying a Series of

Hardware Trigger Transitions

You can set the camera so that it will react to a continuous series of external hardware trigger

(ExTrig) transitions and then you can cycle the ExTrig signal as desired to begin image acquisition.

When you are using an ExTrig signal to start image acquisition, you should monitor the camera’s

trigger ready (TrigRdy) output signal and you should base the use of your ExTrig signal on the state

of the trigger ready signal.

To set the camera to react continuously to ExTrig signal transitions, follow the sequence below. The

sequence assumes that you have set the camera for rising edge triggering and for the timed

exposure mode.

1. Access the camera’s API and set the exposure time parameters for your desired exposure

time.

2. Set the value of the camera’s Acquisition Mode parameter to Continuous.

3. Execute an Acquisition Start command. This prepares the camera to react to the trigger

signals.

4. Check the state of the camera’s Trigger Ready signal:

a. If the TrigRdy signal is high, you can transition the ExTrig signal when desired.

b. If the TrigRdy signal is low, wait until TrigRdy goes high and then transition the ExTrig signal

when desired.

5. When the ExTrig signal transitions from low to high, image acquisition will start. Exposure will

continue for the length of time you specified in step 1.

6. At the end of the specified exposure time, readout and transmission of the acquired image will

take place.

7. Repeat steps 4 and 5 each time you want to start another image acquisition.

8. Execute an Acquisition Stop command. The camera will no longer react to hardware triggers.

If you are acquiring images using a series of hardware trigger transitions, you must avoid acquiring

images at a rate that exceeds the maximum allowed with the current camera settings. You can

avoid triggering image acquistion at too high a rate by using the trigger ready signal as described

above.

You should also be aware that if the Acquisition Frame Rate Abs parameter is enabled, it will

influence the rate at which images can be acquired:

 If the Acquisition Frame Rate Abs parameter is set to a value less than the maximum allowed,

you can trigger acquisition at any rate up to the set value.

 If the Acquisition Frame Rate Abs parameter is set to a value greater than the maximum

allowed, you can trigger acquisition at any rate up to the maximum allowed image acquisition

rate with the current camera settings.

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Basler SCOUT LIGHT User Manual Page 57