GPI Control

General Purpose Interface (GPI) is a high/low voltage signalling protocol that allows the switcher to send simple commands to an external device, or receive commands from a device. Each pin on the GPI is set as either high (+5 Volts), or low (0 Volts), and it is the switching between high and low that sends commands to the external device, or to the switcher.

The switcher has both fixed and configurable GPIs. The 10 fixed GPI inputs and 10 fixed GPI outputs are located on the Frame CPU board. The 24 GPIs on each Reference with Tally board can be configured as either an input, or an output.