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rINSTCONTROL/Base instrument classes/MyCommCont.m
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MyCommCont.m
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% Communication container.
% This class provides extended functionality for communication using VISA,
% tcpip and serial objects or any other objects with similar usage.
classdef MyCommCont < handle
% Giving explicit set access to this class makes properties protected
% instead of private
properties (GetAccess=public, SetAccess={?MyClassParser,?MyCommCont})
interface='';
address='';
end
properties (Access = public)
Comm % Communication object
end
methods (Access = public)
%% Constructor and destructor
function this = MyCommCont()
try
connect(this);
catch ME
warning(ME.message);
% Create a dummy
this.Comm=serial('Dummy');
end
configureCommDefault(this);
end
function delete(this)
% Close the connection to the device
try
closeComm(this);
catch
warning('Connection could not be closed.');
end
% Delete the device object
try
delete(this.Comm);
catch
warning('Communication object could not be deleted.');
end
end
%% Set up communication
% Create an interface object
function connect(this)
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
end
% Set by default larger buffer sizes and longer timeout than MATLAB
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 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
% try to find and close all the devices with the same
% VISA resource name
try
instr_list=instrfind('RsrcName',this.Comm.RsrcName);
fclose(instr_list);
fopen(this.Comm);
warning(['Multiple instrument objects of ' ...
'address %s exist'], this.address);
catch
error('Could not open device')
end
end
end
function closeComm(this)
fclose(this.Comm);
end
%% Communication
% Write textual command
function writeCommand(this, cmd)
try
fprintf(this.Comm, cmd);
catch ME
try
% Attempt re-opening communication
openComm(this);
fprintf(this.Comm, cmd);
catch
rethrow(ME);
end
end
end
% Query textual command
function result = queryCommand(this, cmd)
try
result = query(this.Comm, cmd);
catch ME
try
% Attempt re-opening communication
openComm(this);
result = query(this.Comm, cmd);
catch
rethrow(ME);
end
end
end
end
end
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