function s=settrigger(port,mode)

%    SOSI-M2 V1.0 MATLAB M-file
%
% Change sample trigger mode.
%
% Args: s=settrigger(port,mode)
%
% port: 'COM2' for example
% mode:
%      'ic' internal clock
%      'er' external rising edge
%      'ef' external falling edge

% Check input argument
if mode=='ic'
    s='#seti';
elseif mode=='er';
    s='#seter';
elseif mode=='ef';
    s='#setef';
else
    disp('Argument error: mode');
    return;
end

try

% Set up port
    spo=serial9600(port);
    wakeupsub(spo);

    s=cmd(spo,s,0.1);
    fclose(spo);
    return;

catch
    s=lasterr;
    disp(s);
    fclose(spo);
    return;
end