Recommended Methods For Controlling Exposure Start - Basler A101f User Manual

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.
6. Repeat steps 3, 4, and 5 until you have captured the number of frames specified in the count
number register.
The MULTI_SHOT control register is self cleared after transmission of the last frame.
ExTrig/Continuous-Shot Operation
In ExTrig/Continuous-shot operation, the camera continuously exposes and transmits frames. 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 ISO_EN/CONTINUOUS_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.
6. Repeat steps 3, 4, and 5 each time that you want to capture a frame.
7. Frame exposure and transmission stop when the ISO_EN/CONTINUOUS_SHOT control
register is set to 0.

3.2.4 Recommended Methods for Controlling Exposure Start

If a camera user requires close control of exposure start, there are several general guidelines that
must be followed:
• the camera should be placed in continuous shot mode.
• the user must use an external trigger signal to start exposure and must set the camera to
react to a rising edge of the trigger signal (i.e., active high).
• the user must monitor the trigger ready signal and the integrate enabled signal (see Sections
3.3 and 3.4 for an explanation of these signals).
• a rising edge of the external trigger signal must only occur when the trigger ready signal is
high.
Assuming that these general guidelines are followed, the reaction of the camera to a rising
external trigger signal will be one of two cases. In case one, the rising edge of ExTrig occurs when
the camera is not transferring a captured frame from the sensor to the image buffer. In case two,
the rising edge of ExTrig occurs when the camera is transferring a captured frame from the sensor
to the image buffer.
f
BASLER A101
DRAFT
Operation and Features
3-5