This switcher is proper to control with only a remote command, until to 8 machines that use an RS422 interface (generally videotape recorders).
The serial protocol RS422, developed by the Sony, uses standard connectors 9-Pin D-Subs female and is normally adopted by professional and broadcast audio and video equipment.
RS422 (EIA422) employes four wires with differential line (free of noise), full-duplex, multi point.
On the back of the apparatus it is present a connector to be able to connect an external keyboard (remote control from another stationing).
The 8x1 switcher is built in a metallic container, tall an 1 rack unit 19" and it is endowed with embedded power supply.