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rINSTCONTROL/@MyCommCont/MyCommCont.m
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MyCommCont.m
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% Communicator container.
% This class provides extended functionality for communication using VISA,
% tcpip and serial objects or any other objects that have a similar usage.
classdef MyCommCont < handle
properties (Access = public)
interface = 'serial'
address = 'placeholder'
% Communication object
Comm
end
methods (Access = public)
function this = MyCommCont(varargin)
P = MyClassParser(this);
processInputs(P, this, varargin{:});
end
function delete(this)
% Close the connection to the device
try
closeComm(this);
catch ME
warning(['Connection could not be closed. Error: ' ...
ME.message]);
end
% Delete the device object
try
delete(this.Comm);
catch ME
warning(['Communication object could not be deleted. ' ...
'Error: ' ME.message]);
end
end
%% Set up communication
% Create an interface object
function connect(this)
if ~isempty(this.Comm)
% Delete the existing object before creating a new one.
delete(this.Comm);
end
try
switch lower(this.interface)
% Use 'constructor' interface to create an object with
% more that one parameter passed to the constructor
case 'constructor'
% In this case 'address' is a MATLAB command that
% creates communication object when executed.
% Such commands, for example, are returned by
% instrhwinfo as ObjectConstructorName.
this.Comm = eval(this.address);
case 'visa'
% visa brand is 'ni' by default
this.Comm = visa('ni', this.address);
case 'tcpip'
% Works only with default socket. Use 'constructor'
% if socket or other options need to be specified
this.Comm = tcpip(this.address);
case 'serial'
this.Comm = serial(this.address);
otherwise
error(['Unknown interface ''' this.interface ...
''', a communication object is not created.'...
' Valid interfaces are ''constructor'', ' ...
'''visa'', ''tcpip'' and ''serial'''])
end
configureCommDefault(this);
catch ME
warning(ME.message);
% Create a dummy
this.Comm = serial('placeholder');
end
end
% Set larger buffer sizes and longer timeout than the MATLAB default
function configureCommDefault(this)
comm_props = properties(this.Comm);
if ismember('OutputBufferSize',comm_props)
this.Comm.OutputBufferSize = 1e7; % bytes
end
if ismember('InputBufferSize',comm_props)
this.Comm.InputBufferSize = 1e7; % bytes
end
if ismember('Timeout',comm_props)
this.Comm.Timeout = 10; % s
end
end
function bool = isopen(this)
try
bool = strcmp(this.Comm.Status, 'open');
catch
warning('Cannot access the communicator Status property');
bool = false;
end
end
% Opens the device if it is not open. Does not throw error if
% device is already open for communication with another object, but
% tries to close existing connections instead.
function openComm(this)
try
fopen(this.Comm);
catch
if isa(this.Comm, 'serial')
% Try to find and close all the serial objects
% connected to the same port
instr_list = instrfind('Port', this.Comm.Port);
else
% Try to find and close all the devices with the same
% VISA resource name
instr_list = instrfind('RsrcName', this.Comm.RsrcName);
end
fclose(instr_list);
fopen(this.Comm);
warning(['Multiple instrument objects of ' ...
'address %s exist'], this.address);
end
end
function closeComm(this)
fclose(this.Comm);
end
%% Communication
% Write textual command
function writeString(this, str)
try
fprintf(this.Comm, str);
catch ME
try
% Attempt re-opening communication
openComm(this);
fprintf(this.Comm, str);
catch
rethrow(ME);
end
end
end
% Query textual command
function result = queryString(this, str)
try
result = query(this.Comm, str);
catch ME
try
% Attempt re-opening communication
openComm(this);
result = query(this.Comm, str);
catch
rethrow(ME);
end
end
end
end
end
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