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function [out_str] = query_usbtmc(fname, in_str)
fname = '/dev/usbtmc0';
string_terminator = 10;
fhr = fopen( fname, 'r');
fhw = fopen( fname, 'w');
fwrite(fhw, in_str);
out_str = [];
[out_byte, cnt] = fread(fhr,1,'*uint8');
while (out_byte ~= string_terminator) & (cnt ~= 0)
out_str = [ out_str, char(out_byte) ];
out_byte = fread(fhr,1,'*uint8');
end
fclose(fhr);
fclose(fhw);
end
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