Using the NI Switch Add-on

I am looking for any information on using the NI-Switch add-on to control RF switches, example code, or a list of commands in NI-Switch. I am trying to control a NI-2545 and NI -2548 in a PXI chassis. Any help would be greatly appreciated!

Answer 1

[Nathan Davey]

This works. The key is, you must disconnect from the switch after each action or you won't be able to make a new connection

%%Intialization Section
%set the address for the respective switchs.  Second char is the location
%as seen by matlab
    switch41 = icdevice('niswitch.mdd', 'Dev1');
    switch42 = icdevice('niswitch.mdd', 'PXI1Slot6');
    switch81 = icdevice('niswitch.mdd', 'PXI1Slot3');
    switch82 = icdevice('niswitch.mdd', 'PXI1Slot7');

% Connect to the switches
    connect(switch41);
    connect(switch42);
    connect(switch81);
    connect(switch82);
%%Variable Creation and Conversion Section
%Convert channel strings to doubles

%NI_2548 switch position definitions
    for i=0:3
        eval(sprintf('com%i = [double(char(string("com%i"))) 0];', i, i));
    end

    for i=0:3
        eval(sprintf('nc%i = [double(char(string("nc%i"))) 0];', i, i));
    end

    for i=0:3
        eval(sprintf('no%i = [double(char(string("no%i"))) 0];', i, i));
    end

%NI_2545 switch position definitions
    com = [double('com') 0];
    for i=0:3
        eval(sprintf('ch%i = [double(char(string("ch%i"))) 0];', i, i));
    end



%%Switch Manipulation Section

%create the child object for the switches 
    Chan_con_1 = get(switch41, 'Route');
    Chan_con_2 = get(switch42, 'Route');
    Chan_con_3 = get(switch82, 'Route');
    Chan_con_4 = get(switch81, 'Route');

%Prior to switching to a position you must ensure that it is not already connected and you must...
%disconnect from the switch after use before being able to move the switch position to a new one.
%connects the common to desired switch position

    invoke(Chan_con_1, 'connect', ch3, com );
    pause(1);
    invoke(Chan_con_2, 'connect', ch1, com );
    pause(1);
    invoke(Chan_con_3, 'connect', no0, com0 );
    pause(1);
    invoke(Chan_con_4, 'connect', no0, com0 );
    pause(2);

%disconnect the switch channels
    invoke(Chan_con_1, 'disconnectall');
    pause(1);
    invoke(Chan_con_2, 'disconnectall');
    pause(1);
    invoke(Chan_con_3, 'disconnect', no0, com0);
    pause(1);
    invoke(Chan_con_4, 'disconnect', no0, com0);

%%close the instrument object
    disconnect(switch41);
    disconnect(switch42);
    disconnect(switch81);
    disconnect(switch82);

%%clear the insrument object from the object list
    delete(switch41);
    delete(switch42);
    delete(switch81);
    delete(switch82);