Microscan Vision Hawk Smart Camera, Manual

Page: 39 / 98

Trigger Debounce
System Component
s
2
Vision HAWK Smart Camera Guide 2-27
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
μ
s).
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: 1.10
Camera Name
VisionHAWK 752x480 CMOS // Name Displayed
in Camdef Selection Dialog
Digitizer Type 4000 // Number
associated with VisionHawk CMOS Camera
Stride
752 // Image Width
Rows 480 // 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 16667 // Fastest time to acquire a frame: 60 FPS
for VisionHawk CMOS Camera // -1 Disables timeout feature
// 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
Gain Dflt 20
Gain Min 0