Returns a bus link in the diagram that is part of block.

## Inputs

diagram
The diagram that the components are in.
Type: diagram
block
The source block that the link is connected to.
Type: block
sourcePortNum
The number of the source port that the link is connected to.
Type: integer
sourceIOType
The IO type of the port that the link is connected to.
Type: string

## Outputs

Type: hwdcConnection

## Examples