Sony sensors support Sequential Trigger mode. In order to achieve the maximum framerate when using Sequential Trigger mode, the external trigger pulses must meet several requirements.


External Trigger Pulse


A diagram of an external trigger pulse can be seen in the following image:






Hardware Trigger Mode 0:


In order to achieve the maximum framerate when using hardware trigger mode 0, the external trigger pulses must meet the following requirements:

  • Integration starts on the rising edge of the external trigger pulse.
  • Thigh: Should be greater than 1 H period, and less than or equal to the exposure time.
  • The falling edge of the external pulse should not occur within the trigger prohibited period. The trigger prohibited period is shown in the Figure 1.

    - Generally, the falling edge should occur after the sensor frame readout.

    - Tlow should be set carefully to ensure this.


Hardware Trigger Mode 1:


In order to achieve the maximum framerate when using hardware trigger mode 1, the external trigger pulses must meet the following requirements:

  • Integration Starts on the rising edge of the external trigger pulse.
  • Thigh: Should be equal to the exposure time, in terms of number of H periods.
  • The falling edge of the external pulse should not occur within the trigger prohibited period. The trigger prohibited period is shown in the Figure 1.

    - Generally, the falling edge should occur after the sensor frame readout.

    - Tlow should be set carefully to ensure this.


Figure 1. Trigger Prohibited Period



PL-D752


Values of 1 H (henry) period:

1 H period for 10-bit output with 8-channel LVDS = 4.848us.

1 H period for 12-bit output with 8-channel LVDS = 6.222us.


Frame readout time

Under the normal operating mode: Frame readout time is constant = (1 H period) * (the number of lines per full frame), where number of lines per full frame is (ROI_height of a full ROI + 54).

Under the fixed frame rate mode: Frame readout time = (1 H period) * (the number of lines per frame), where number of lines per frame is (ROI_height + 38).

Note: under the normal operating mode, the frame readout time is constant and does not change by reducing the ROI.



PL-D755


Values of 1 H (henry) period:

1 H period for 10-bit output with 8-channel LVDS = 5.9259us.

1 H period for 12-bit output with 8-channel LVDS = 6.9899us.


Frame readout time

Under the normal operating mode: Frame readout time is constant = (1 H period) * (the number of lines per full frame), where number of lines per full frame is (ROI_height of a full ROI + 46).

Under the fixed frame rate mode: Frame readout time = (1 H period) * (the number of lines per frame), where number of lines per frame is (ROI_height + 38).

Note: under the normal operating mode, the frame readout time is constant and does not change by reducing the ROI.


PL-D759


Values of 1 H (henry) period:

1 H period for 10-bit output with 8-channel LVDS = 9.427us.

1 H period for 12-bit output with 8-channel LVDS = 11.191us.


Frame readout time

Under the normal operating mode: Frame readout time is constant = (1 H period) * (the number of lines per full frame), where number of lines per full frame is (ROI_height of a full ROI + 70).

Under the fixed frame rate mode: Frame readout time = (1 H period) * (the number of lines per frame), where number of lines per frame is (ROI_height + 54).

Note: under the normal operating mode, the frame readout time is constant and does not change by reducing the ROI.



PL-D7512


Values of 1 H (henry) period:

1 H period for 10-bit output with 8-channel LVDS = 9.427us.

1 H period for 12-bit output with 8-channel LVDS = 11.191us.


Frame readout time

Under the normal operating mode: Frame readout time is constant = (1 H period) * (the number of lines per full frame), where number of lines per full frame is (ROI_height of a full ROI + 62).

Under the fixed frame rate mode: Frame readout time = (1 H period) * (the number of lines per frame), where number of lines per frame is (ROI_height + 54).

Note: under the normal operating mode, the frame readout time is constant and does not change by reducing the ROI.


Please note: a number of lines per frame could be determined by a height of a set Region of Interest (ROI) + a number of additional lines with respect to a camera operating mode. For instance, if a PL-D752 camera operates in the fixed frame rate mode and its ROI is set to 1920 x 1200, the number of lines per frame equals 1200 + 38 = 1238.


To Start Streaming:


        1. Set the exposure time and choose camera mode.

        2. Select hardware trigger mode 0 or 1, and enable hardware trigger.

        3. Start the stream. 

        4. Generate external trigger pulses continuously.


To Stop Streaming:


        1. Stop generating external trigger pulses.

        2. Stop the stream.