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).
Pin Assignment
| Pin | Wire Color | Pin Name | Function | Comments |
|---|---|---|---|---|
1 | Red | 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 | Violet | TRIGGER+ or GPI+ | Positive terminal of optically isolated trigger input or General Purpose Input. | See trigger or GPI notes below chart. |
3 | Brown | TRIGGER- or GPI- | Negative terminal of optically isolated trigger input or General Purpose Input. | See trigger or GPI notes below chart. |
4 | Yellow | 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 | Green | GPO1- | Negative terminal of optically isolated General Purpose Output 1. | Optical isolator emitter output. Typically connected externally to ground at pin 8. |
6 | Orange | GPO1 | 3.3V HCMOS General Purpose Output 1. | The maximum HCMOS output current is 5mA. |
7 | Blue | GPO2 | 3.3V HCMOS General Purpose Output 2. | The maximum HCMOS output current is 5mA. |
8 | Black | GROUND | Logic ground. | Logic ground is internally connected to the camera metal enclosure. |
Trigger Notes
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.
Trigger pulse duration must be at least 300 us, otherwise trigger pulses might be ignored.
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).
Trigger Polarity
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.
GPI Notes
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.
For Trigger and GPI implementation, review the Trigger and the General Purpose Input Output articles respectively.