8Rear PanelXLR inputs and Outputs for Balanced Audio Connection.The GPI socket can be used for simple external control. The HDR-70 can acceptpulse or level trigger inputs, which can trigger record or playback and pausecommands.RS-232/422 user selectable remote control (select in menu)Black Burst input/ output Can be used as a video reference source whensynchronization other devices to the HDR-70.HDR-70 can select time code source from internal or external, when you set timecode source from external, you can connect to this input port.HDMI Out Ports. Ports for connecting to HDMI external devices.HD- SDI input, output and pass-through output connectors. 4:2:2 SDI Video datasupports SMPTE 292M standard at 1.5Gbps.SDI transfers professional level video signals and itās can connect to longdistance transmission systems.DC In Socket. Connect the supplied 12V PSU to this socket. The connection canbe secured by screwing the outer fastening ring of the DC In plug to the socket.Power On/Off Switch. Switches the power On / Off.Grounding Terminal. When connecting this unit to any other component, makesure that it is properly grounded by connecting this terminal to an appropriatepoint. When connecting, use the socket and be sure to use wire with a cross-sectional area of at least 1.0 mm2.