Code covered by the BSD License  

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Gilson HPLC Pump RS232 communication

Gilson HPLC Pump RS232 communication

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Communicates with Gilson HPLC pumps via RS232 (and 508 interface module)

gilsonpumpobj(comPort, userData)
function serialObject = gilsonpumpobj(comPort, userData)
% GILSONPUMPOBJ Returns the serial object for Gilson pumps
% serialObject = gilsonpumpobj(comPort) returns the serial object for
% Gilson pumps given a suitable COM port number (unsigned integer: 1-255).
% If an object already exists on that COM port (open or otherwise), returns
% an error. Information can be passed into the serial object through the
% optional userData argument.  Information is stored here during a
% communication session with the pump for more efficient communication.

% Normal usage:

% e.g. serialObject = gilsonpumpobj(9) - returns a serial object for the
% Jasco pump on COM9


% checks the number of arguments
error(nargchk(1, 2, nargin))

if ~isscalar(comPort) || comPort ~= uint8(comPort) || ~comPort
    % errors
    error('comPort must be an unsigned integer from 1 to 255')
end

% if object on specified COM port exists, errors, otherwise creates
% serial object

% initialises variables
serialPort = sprintf('COM%d', comPort);

% if serial object does not exist, defines serial object and opens it
if isempty(instrfindall('Port', serialPort))
    % creates serial object
    serialObject = serial(  serialPort, ...
        'BaudRate' ,19200,...
        'DataBits', 8,...
        'Parity', 'even',...
        'StopBits', 1,...
        'Flowcontrol', 'none',...
        'Terminator', '',...
        'TimeOut', 0.5);

    % if userData was provided, modify the object
    if nargin >= 2
        % changes it
        serialObject.UserData = userData;
    end

else
    % errors
    error('Object(s) already exist on this serial port')
end

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