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/usr/share/psychtoolbox-3/PsychHardware/PR655Toolbox/PR655write.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.

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function PR655write(cmdStr)
% Write a string of chars to PR655. Add [CR] terminator if necessary
% 
% 01/16/09    tbc   Wrote it.
%

global g_serialPort;

% Check for Terminator and add if necessary
if cmdStr(end)~=char(13)
    cmdStr = [cmdStr char(13)];
end

% Write sequence of chars to PR655
for i = 1:length(cmdStr)
    IOPort('write', g_serialPort, upper(cmdStr(i)));
    pause(0.05)
end

return