Blackmagic Design GPI & Tally Interface for ATEM Production Switchers Add tally to your ATEM switcher with Blackmagic Design’s GPI and Tally Interface! With 8 contact closure tally outputs, you can send a tally signal to your cameras, replay machines and monitors so everyone knows which camera is ‘on-air’! If you need more tally outputs, simply connect multiple GPI and Tally Interfaces together because it connects via Ethernet to your ATEM production switcher. Connections Contact Closure 25 pin D-type connector providing 8 opto isolated inputs and 8 relay contact closure outputs. Computer Interface 1 x USB 2.0 high speed interface for configuration and firmware updates. Inputs Optical isolators triggered by connection to ground. Max 5V at 14mA. Outputs Mechanical relay contact closure to ground. Max 30V at 1A. Ethernet 10/100 BaseT with loop through for connecting to other ethernet enabled equipment. Physical Specifications