Chapter 2 System Components Trigger Debounce Trigger Debounce is the ability of the system to accomodate switching noise on a trigger state change – a common issue with relays that have some intermittent contact while engaging. Trigger overruns (when the vision system is triggered faster than the device can process) can be avoided by increasing the “debounce” time in the camera definition file located in the C:\Microscan\Vscape\Drivers\CamDefs directory. The IO Line Debounce High Time and IO Line Debounce Low Time can be added to the file as in the example below. The default debounce time is 1 ms (1,000 μs). Note:
Although the value entered for the "IO Line Debounce Time" is in microseconds, it will only be rounded up to a millisecond value. For example, entering the value 1001 will resolve to 2 ms; entering a value of 2800 will resolve to 3 ms. The min value for "IO Line Debounce Time" is 0, which disables software debounce altogether. The maximum value is 100000 (100 ms). Camera Definition File Example // Camera Definition File // Version:
1.02 Camera Name VisionMINI 1280x1024 // Name Displayed in Camdef Selection Dialog Digitizer Type 5000 // Number associated with VisionMini SXGA Stride 1280 // Image Width Rows 1024 // Image Height X Offset 0 // Image X Offset Y Offset 0 // Image Y Offset Bits Per Pixel 8 // Bits that represent Pixel Value Pixel Type 0 // Type of Pixel: MONOCHROME=0, COLOR_RGB=1, COLOR_BGR=2, COLOR_BAYGR8=3, COLOR_BAYRG8=4, COLOR_BAYGB8=5, COLOR_BAYBG8=6, COLOR_HSI=7 Image Structure 1 // Pixel Organization: Packed=1, TwoPlanes = 2, ThreePlanes = 3 Async Control 1 // Controllable shutter time. Usually using a pulse width specified in usecs Usecs Per Frame 62500 // Fastest time to acquire a frame:
16 FPS // -1 Disables timeout feature X Offset 0 Y Offset 0 // IO Configuration GPIO Edit Mask 0x0000 GPIO Defaults 0x0001 // 1 General Purpose Input 3 General Purpose Outputs GPIO Count 4 GPIO Inputs 1 GPIO Outputs 3 Sensors 1 // One input dedicated to Trigger signal Strobes 0 Virtual IO 2048 IO Line Debounce High Time 2000 //usecs IO Line Debounce Low Time 2000 //usecs // Focus & Photometry Ranges 2-12 Vision MINI Smart Camera Guide