PL-D enclosed cameras with a Machine Vision interface provide hardware Trigger and GPIO capability. The mating connector is an 8-pin Hirose HR25A-7P-8P cable plug with solder pins for 28 AWG wires. The connector pinout is shown below (not-to-scale for clarity of pin numbers).
|1||VBUS||Power output from USB3 cable, shared with camera, typically +5 VDC.||Actual voltage level depends on the computer, cable length, and total current load. The maximum current available from this output pin is 100mA.|
|2||TRIGGER+ or GPI+||Positive terminal of optically isolated trigger input or General Purpose Input.||See trigger or GPI notes below chart.|
|3||TRIGGER- or GPI-||Negative terminal of optically isolated trigger input or General Purpose Input.||See trigger or GPI notes below chart.|
|4||GPO1+||Positive terminal of optically isolated General Purpose Output 1.||Optical isolator open collector output. Provides current sink to pin 5 when GPO1 is active. Maximum 15 mA. Maximum 40 V.|
|5||GPO1-||Negative terminal of optically isolated General Purpose Output 1.||Optical isolator emitter output. Typically connected externally to ground at pin 8.|
|3.3V HCMOS General Purpose Output 1.||The maximum HCMOS output current is 5mA.|
|3.3V HCMOS General Purpose Output 2.||The maximum HCMOS output current is 5mA.|
|8||GROUND||Logic ground.||Logic ground is internally connected to the camera metal enclosure.|
- To initiate a trigger, apply a voltage between 5V and 12V (4-11mA) to the optically isolated trigger input terminals.
- The optically isolated trigger input includes an internal 1K ohm series resistor.
- When using a trigger voltage larger than 12V, add an external series resistor with an adequate power rating.
- Debounce delay is set in the camera to 1 microsecond.
- A typical application of the trigger input is to connect Pin 1 (POWER) to Pin 2 (TRIGGER+), and then use the open collector output of an external position sensor device to complete the circuit from Pin 3 (TRIGGER–) to Pin 8 (GROUND).
- The trigger polarity can be set to Positive or Negative. (See the Triggers and GPO Tab - Pixelink Capture or External Control Tab - Capture OEM)
- With the trigger polarity set to Positive, a camera will trigger on the rising edge of the trigger signal.
- With the trigger polarity set to Negative, a camera will trigger on the falling edge of the trigger signal.
- Review the trigger notes above for electrical characteristics of the GPI.
- Only GPIO with the index 1 can be configured for reading and returning a GPI status value.