The C3IO-16 is a 3-Series control card that provides sixteen Crestron Versiport I/O ports. Each I/O port can function as a 0-10V analog input, a digital logic sensing input, or a digital logic output. The card is designed to install in a control card expansion slot of a 3-Series Control System model PRO3 or AV3, or 3-Series Card Interface model CEN-CI3-1 or CEN-CI3-3.