Chapter 24: I/O signals and communicating with external devices

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