Getting Ready - RTR-50 27RS-232C (Serial)AC AdaptorConnection JackUSB (MiniB)[LEFT SIDE] [RIGHT SIDE]NOTE:- "RTR-61 for Windows (EU)" can only be used when the PC communication connectionis with a USB Cable.[Back]OpticalCommunication AreaBattery CoverInstalling batteries for Repeater(s)Only necessary when using Repeater(s)When using an RTR-50 unit as a Repeater, insert 2 AA alkaline batteries asshown in the figure. The Monitor LED will blink once when usable batteries areinstalled. NOTE:- Always use two batteries of the same type.- Make sure not to mistake + / -.- Instead of batteries, it is possible to use an ACadaptor or connect to some other externalpower supply. See "Options" (page 142).