NeuroNexus SmartBox Instruction Manual page 41

Auxiliary input data file: auxin.dat
This file contains a matrix of ADC samples from all enabled SmartLink auxiliary input channels in uint16 format. To convert to volts, multiply by
0.0000374.
Although the SmartBox interface samples the SmartLink auxiliary input channels at one-fourth the rate of the amplifiers, each auxiliary input sample is
™
repeated four times in this file so that this data may easily be aligned with the timestamp vector in the time.dat file.
If no auxiliary input channels are enabled in the GUI, this file will not be written.
The following MATLAB code reads an auxiliary input data file and creates a waveform matrix with units of volts:
num_channels = length(aux_input_channels);
fileinfo = dir('auxiliary.dat');
num_samples = fileinfo.bytes/(num_channels * 2);
fid = fopen('auxiliary.dat', 'r');
v = fread(fid, [num_channels, num_samples], 'uint16');
fclose(fid);
v = v * 0.0000374; % convert to volts
Supply voltage data file: supply.dat
This file contains a matrix of ADC samples from all enabled SmartLink supply voltage sensor channels in uint16 format. To convert to volts, multiply by
0.0000748.
Although the SmartBox interface software samples the SmartLink auxiliary input channels at one-sixtieth the rate of the amplifiers, each supply volt-
™
age sample is repeated sixty times in this file so that this data may easily be aligned with the timestamp vector in the time.dat file.
% aux input channel info from header file
% uint16 = 2 bytes
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APPENDIX B