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FAQ: How do I interface with the EyeLink Host PC analog card?
Sam
Research Support Specialist
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Joined: Aug 2020
Posts: 1,131

#1
09-09-2020, 15:52
The optional Analog card for the EyeLink Host PC provides a way to stream the gaze data as analog voltages, as well as send and receive TTL signals between the eye tracker and other lab equipment.
  • Analog Output
    By default, the card outputs three channels of analog data for each eye being tracked:
    • Gaze X position
    • Gaze Y position
    • Pupil Size
    The included breakout board provides standard BNC connectors for these channels, making it easy to connect to other analog recording devices.

  • Digital Input/Output (I/O)
    The card also features 16 digital channels for two-way communication.
  • Digital Inputs: You can configure the inputs to function as a response button box, allowing participant responses to be sent directly to the Host PC. These digital signals can also be recorded as markers in the EDF data file.
  • Digital Outputs: You can control the outputs from your Display PC by sending write_ioport commands. This allows your experimental script to send TTL signals to synchronize with other equipment. The command requires the port address (typically 4 or 5 for the analog card) and the 16-bit Hex value you want to send.

    Code:
    #write_ioport <ioport> <data> ;;          <ioport>: byte hardware I/O port address ;;          <data>: data to write write_ioport 0x4 0xFF
See Section 7.4 Digital Inputs and Outputs of the User Manual for more information on setting up the analog card for sending and receiving TTL triggers.


Messages In This Thread
How do I interface with the EyeLink Host PC analog card? - by Sam - 09-09-2020, 15:52