AW00123409000 Camera Functional DescriptionBasler ace USB 3.0 654.2 Overview for Cameras with CMOSSensorCameras with CMOS sensor are listed in Section 1.3.2 on page 8.The cameras provide functionalities such as an electronic rolling shutter or a global shutter (seeSection 6.6 on page 142), and electronic exposure time control.Exposure start and exposure time can be controlled by parameters transmitted to the camera viathe Basler pylon API and the USB 3.0 interface. There are also parameters available to set thecamera for single frame acquisition or continuous frame acquisition.Exposure start can also be controlled via an externally generated "frame start trigger" signal appliedto a camera input line (hardware frame start trigger; HWFSTrig). The HWFSTrig signal facilitatesperiodic or non-periodic frame acquisition start. Exposure modes are available that allow the lengthof exposure time to be set for a pre-programmed period of time or, with the exception of somecamera models, to be directly controlled by the HWFSTrig signal.During exposure, electrical charges accumulate in the sensor’s pixels. After exposure was ended,the accumulated charges are read out of the sensor. At readout, the charges are transported fromthe row’s light-sensitive elements (pixels) to the analog processing controls (see Figure 36 onpage 66). As the charges move through the analog controls, they are converted to voltagesproportional to the size of each charge. Each voltage is then amplified by a Variable Gain Control(VGC). Next the voltages are digitized by an Analog-to-Digital converter (ADC). After the voltageshave been amplified and digitized, they are passed through the sensor’s digital controls foradditional signal processing. The digitized pixel data leaves the sensor, passes through an FPGA,and moves into a buffer.The pixel data leaves the buffer and passes back through the FPGA to a controller where it isassembled into data packets. The packets are then transmitted by bulk transfer via a USB 3compliant cable to a USB 3 host adapter of the host computer. The controller also handlestransmission and receipt of control data such as changes to the camera’s parameters.
