Blackmagic Design GPI and Tally Interface
                                
                                
                             
                            
                         
                            
                            
                        Blackmagic Design GPI and Tally Interface; GPI and Tally Interface for Atem production switcher; With 8 Contact closure tally outputs, tally signals can be send to your cameras, replay machines and monitors, so everyone knows which camera is 'on-air'; if more tally outputs are required, several GPI and Tally