User manual

Appendix A: Using the EyeLink 1000 Analog and Digital Output Card
© 2005-2008 SR Research Ltd.
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terminals on the connection board. Buttons and input ports are defined in
BUTTONS.INI, with port addresses of 2 for port A, and 3 for port B.
Here is an example of defining a button on port A, and assigning port B as the
input port:
create_button 8 2 0x01 1 ; button 8, input A0, 0 is active
input_data_ports 3 ;; digital inputs B0..B7 as input port
input_data_mask 0xFF ;; use all bits
7.4.1 Analog Data Output Assignments
The EyeLink 1000 hardware outputs analog voltages on 3 channels. The table
below summarizes the port assignment, with X and Y representing horizontal
and vertical position data, and P representing pupil size data.
DAC0 DAC1 DAC2 DAC3 DAC4 DAC5
X Y P -- -- --
Table 1. Analog Channel Data Assignments
Eye
tracking
mode
Analog
output
mapping
Channels
available
DAC0 DAC1 DAC2 DAC3 DAC4 DAC5
left / right Monocular 6 X Y P -- -- --
Binocular Monocular 6 left X left Y left P right X right Y right P
Left Binocular 6 left X left Y left P -- -- --
Right Binocular 6 -- -- -- right X right Y right P
Binocular Binocular 6 left X left Y left P right X right Y right P
left / right Monocular 4 X Y P -- -- --
Binocular Monocular 4 left X left Y right X right Y -- --
Left Binocular 4 left X left Y -- -- -- --
Right Binocular 4 -- -- right X right Y -- --
Binocular Binocular 4 left X left Y right X right Y -- --
Table 1. Analog Channel Data Assignments for the EyeLink
1000 Hardware
The EyeLink 1000 hardware outputs analog voltages on 3 to 6 channels,
depending on the mode of operation (monocular or binocular) and the analog
card configuration. The monocular analog output configuration (set by the
“analog_binocular_mapping” command in the ANALOG.INI file) should be used
in most cases, as it assigns the eye being actively tracked to the first 3
channels. When binocular mode is selected, left and right eye data is assigned
to fixed channels. The analog channel assignments may also be limited to 4
channels (using the “analog_force_4channel” configuration variable in