Controlling Exposure Start With An Extrig Signal - Basler A101f User Manual

Operation and Features
If the camera is operating in video Format 7, the rate at which frames will be captured and
transmitted is determined by the value stored in the BYTE_PER_PACKET control register (see
Section 3.12.2).
Frame exposure and transmission stop when the ISO_EN/CONTINUOUS_SHOT control register
is set to 0.

3.2.3 Controlling Exposure Start with an ExTrig Signal

The external trigger (ExTrig) input signal can be used to control the start of exposure. A rising
edge on the ExTrig signal begins exposure. The ExTrig signal can be periodic or non-periodic.
The ExTrig signal must be used in combination with a one-shot, multi-shot, or continuous-shot
command. If precise control of exposure start time is desired, you must also monitor the Trigger
Ready signal and you must base the timing of the ExTrig signal on the state of Trigger Ready.
(See section 3.3 for a detailed explanation of the Trigger Ready signal.)
To enable the external trigger feature and set the camera for rising edge triggering, set the
ON_OFF field of the TRIGGER_MODE control register to 1, the Trigger_Polarity field to 1, and
the Trigger_Mode field to 0.
ExTrig/One-Shot Operation
In ExTrig/One shot operation, the camera exposes and transmits a single frame. To use this
method of operation, follow this sequence:
1. Set the SHUTTER control register for your desired exposure time (see Section 3.2.1).
2. Set the ONE_SHOT control register to 1.
3. Check the state of the TrigRdy signal:
a) If TrigRdy is high, you can toggle ExTrig when desired.
b) If TrigRdy is low, wait until TrigRdy goes high and then toggle ExTrig when desired.
4. When ExTrig goes high, exposure will begin. Exposure will continue for the length of time
specified in the SHUTTER control register.
5. At the end of the specified exposure time, frame readout and transmission will take place.
The ONE_SHOT control register is self cleared after frame transmission.
See Section 4.2, Register Write Order, for a complete description of the order in
which the camera registers must be written. This applies for one-shot, multi-shot and
continuous-shot operation.
ExTrig/Multi-Shot Operation
In ExTrig/Multi shot operation, the camera exposes and transmits multiple frames. The number of
frames that will be transmitted is determined by the value stored in the COUNT_NUMBER control
register. To use this method of operation, follow this sequence:
1. Set the SHUTTER control register for your desired exposure time (See Section 3.2.1).
2. Set the MULTI_SHOT control register to 1 and set the COUNT_NUMBER control register to
the desired number of frames.
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BASLER A101