Description should include

explaining the purpose of interfacing robotic systems so that the robot can communicate with its environment
identifying and explaining the function of common input/output (I/O) ports (e.g., digital input ports, digital output ports)
selecting external devices to be connected to an input, such as contact or proximity sensors and safety devices (e.g., motion detectors, door switches)
selecting external devices to be connected to an output (e.g., warning light, drive motor, relay or pneumatic actuator, another robot)
relating machine vision systems to interfacing systems and explaining the purpose of using vision systems in robotics (e.g. part orientation, measurement collection, part inspection).

Process/Skill Questions:

What is an interface, and what is its relationship to robotics?
What external devices can be connected to a robot’s digital input and output ports?
What are the applications of machine vision systems? What are the benefits?
What are the basic components and their functions in a typical vision system?