The GPI & Tally Interface for ATEM Production Switchers displays tallies that show the on-air status of video signals, for use with Blackmagic ATEM switchers and Videohub routers. It provides 8 contact closure inputs and 8 contact closure outputs for wiring into a switcher’s tally and GPI system. Where a production needs more inputs or outputs than a single unit offers, multiple GPI & Tally Interfaces can be connected together, extending the tally and contact-closure count to match the size of the system.