SWITCH-ST is equipped with a passive By-pass system (Relay) able to “bridge” directly to the control and switching circuit, connecting the main input (MAIN) to the output (OUT) in case of failure of the extended device or in case of power failure (except this Back-Up option). SWITCH-ST is equipped with a stereo auxiliary output, on RCA connectors to allow any connection to recording devices. SWITCH-ST is able to accept external normally closed or normally open commands, the inputs are optically isolated. SWITCH-ST, through the Logic I/O port, provides opto-coupled output commands that repeat the state of the switches. “Click to see catalog” AEV SWITCH-ST