Measurement Computing's CIO-QUAD04 is an ISA plug-in board for PC computers that provides inputs and decoding for up to four incremental quadrature encoders. It can also be used as a high-speed pulse counter for general counting applications.
Incremental quadrature encoders are used to provide feedback signals from motors, that is, to count rotations and convert the physical movement into a series of electrical signals. These signals are sent to the computer, which then decides whether or not to trigger signals that control the motor's movement, and what those control signals should be. Measurement Computing's CIO-QUAD04 is the link between incremental quadrature encoders and the computer.
