Operation Manual

21 PRIMETECH ENGINEERING
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4.9. ExposureControl
The ExposureControl register is shown below.
ExposureControl register list
Name Visibility Access
Values
ExposureTime Beginner R/W 15~80000 μsec
The Exposure Time in the internal synchronization mode (when the Trigger Mode is OFF) is set as a discrete value for each
horizontal period inside the CMOS sensor. Therefore, the value entered in this register is automatically rounded to a settable
value.
The maximum and minimum depend on other settings and are as follows.
Minimum of ExposureTime = 1 horizontal period + α (several μsec)
Maximum of ExposureTime = 1 period of the frame rate – 15 horizontal period + α (several μsec)
The horizontal period depends on the number of pixels of the Image Sensor (SXGA / VGA), PixelFormat setting, and
Decimation setting.
1 horizontal period = 7~22 μsec
The longer the exposure time, the more white spots on the screen tend to be.
Therefore, PXG130S / PXG030S is recommend up to 40000 μsec (frame rate is about 25fps).
For PXG130SP / PXG030SP, when the sensor is cooled, the picture is clear even if around 80000 μsec (frame rate is about
12fps).
When TriggerMode on and LevelHigh / LevelLow mode, the ExposureTime register displays the exposure time by the
external trigger.
In LevelHigh / LevelLow mode, writing to the ExposureTime register is invalid.
In TriggerMode on and RisingEdge / FallingEdge mode, the exposure time can be set with the ExposureTime register.
The settable range of exposure time in RisingEdge / FallingEdge mode is 30 ~ 80000 μsec.