Instruction manual

3.3.2.2. Frame Grabber Interface p3i_CL
3.3.2.2.1. CameraLink Connector of p3i_CL
The CameraLink standard defines 4 differential inputs with an additional clock to transmit data and control
signals from the camera to the frame grabber (X0..X3). Another four LVDS pairs are reserved for general
purpose camera control. They are outputs of the p3i_CL and flexible programmable via software. To each
of these outputs you can assign a programmable clock, a static signal(high or low) or one of two signals
which have an adjustable hightime and lowtime, for instance for exposure control.
Additionally the CameraLink standard defines an asynchronous serial protocol for a bidirectional
communication between camera and frame grabber. The signals used are SerTfg and SerTc.
3.3.2.3. 16 pin Header
The 16-Pin Header is an additional interface for user signals and trigger resources.The user inputs are
readable per software to recognize external events.The user outputs can be set statically.
3.3.2.4. Trigger Input
There are several trigger inputs on the frame grabber - optocoupled and TTL. The optocoupled trigger
inputs have optimum noise immunity and 250 V isolation voltage. Trigin_Opt+ (Trigger+ in figure below)
for instance is connected to the anode of a LED, Trigin_Opt- (Trigger- in figure below) to the cathode of
the LED via an internal 220-Ohm resistor. Since the LED needs about 10..20 mA for full drive, a 5 V
voltage source or a TTL output is able to drive sufficient current through the circuit. Higher-voltage
sources may be used with additional limiting resistors. This trigger input is edge-sensitive. The use of
positive or negative edge is possible.
Caution: Do not exceed a maximum of 30 mA LED current!
Opto-coupled Trigger Input Schematic
Chapter 3. Hardware Reference
26