Chapter 26: I/O signals and communicating with external devices

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This chapter explains how to control and inquire non-video input and output (I/O) signals of your hardware. Note that not all Matrox products have I/O signals. For more information on I/O signals supported by your hardware, refer to the MIL Hardware-specific Notes for your Matrox product.

• Communicating with external devices using I/O signals overview
• Steps to use I/O signals
• • Using Matrox Intellicam's Feature Browser
• Basic concepts when dealing with I/O signals
• Using input signals
• • Polling the state of input signals
  • Using interrupts with input signals
  • Using input signals as triggers
• Setting up an output signal
• • Routing a source to an output signal
  • User-bits and controlling the state of output signals
• Timers and coordinating events
• • Delay and duration
  • Timer modes: triggered or continuous
  • Steps to set up timers
  • Timer clock source
• Using quadrature input from a rotary encoder
• • Interpreting the direction of movement from the Gray code
  • Using the rotary decoder's counter
  • Using the rotary decoder's output to trigger a timer or a grab
  • Pixel aspect ratio
• Using I/O command lists
• • Steps to use an I/O command list
  • Scheduling I/O commands
  • Commands that can be added to the I/O command list
  • Using an I/O command list latch
  • Examples
  • • Parts traveling along a conveyor belt that are fixed in position example
    • Different parts traveling along a conveyor belt that are ejected by different devices example
    • Parts traveling along a conveyor belt that are not fixed in position example
    • Always grabbing an image when the conveyor belt is at a given position