How do you access the datatype of Bus Element Ports in MATLAB

I have a model that outputs a Bus of type 'TestBus'. The Bus is comprised of three Doubles, which I define and output using 'Bus Element Outports'.

I would like to access the output datatype of my entire model (which is a 'TestBus'). However, when I access the datatype of the Bus Element Outports, I receive 'Double' instead of 'TestBus'. 

For instance, the following code returns 'Double' on my compiled model:

get(<Bus Element Handle>,'CompiledPortDataTypes').Inport{1}; % Returns Double, should return TestBus

How can I access the Bus output datatype of my Bus Element Ports?

Answer 1

[MathWorks Support Team]

In order to get the Bus datatype of the Bus Element Outports, you must use the complete path of the port rather than the complete path of the block. 

get_param(<Path to Port>,'OutDataTypeStr') % returns 'Bus: TestBus'

In order to get the path to your port, you can double click on your Bus Element Block to open its properties -- at the top, you will see a 'Port name' text box. Alternatively, you can programmatically access the 'Port name': 

pathToPort = [get(<Block Handle>,'Path'), '/', get(<Block Handle>,'PortName')]
dataType = get_param(pathToPort, 'OutDataTypeStr');

If you need to get the block handle for a 'Bus Element In', this can be done the following way: 

inBusElementBlocks = find_system('yourModel', 'BlockType', 'Inport')

% select one of your in bus
inBus = inBusElementBlocks(4);
handle = getSimulinkBlockHandle(inBus);

pathToPort = [get(handle,'Path'), '/', get(handle,'PortName')];
dataType = get_param(pathToPort,'OutDataTypeStr')

If you are looking to get the output datatype of normal Outports, you must follow your original method, using the 'CompiledPortDataTypes' property.