qt slots and signals - 3100/3101 | ADC Corporation rich 888 slot

The 31009 is a terminal card for input and output signals that is used together with the 31005B in combination to be inseted in a scanner slot.

Qt5 also offers a unique and easy-to-use signals and slots mechanism for event generation and handling.

Signals and slots is a language construct introduced in [1] for communication between objects which makes it easy to implement the observer pattern while avoiding boilerplate code.