[. . . ] Supply instabus EIB Connection instabus User interface Display : 24 V DC (+6/-4V) via flush-mounting bus coupler : via user interface AST (2 x 5 poles) : plugged onto coupler : LCD backlit 4 lines (16 characters) or 2 lines (8 characters) or 1 lines (4 characters) : 4 keys : 4max. [. . . ] Planning, installation and commissioning of the unit are performed by means of EIBA certified software. The Info-Display receives telegrams via the instabus EIB and can be used to display (on an LCD display) freely programmable texts and parameters. Each line can be made to represent a function (switching, dimming, displaying of parameters, etc. An alarm message can be combined with an acoustic and or optical warning. Non-observance of the installation instructions may damage the device and cause fire or other hazards. Screw the plastic adapter (4) to the supporting ring (2) Plug the display with flange (5) onto the bus coupler (3). The two keys on the right (1a) are used for scrolling up and down through the messages. The two keys on the left (1b) are assigned to the display line respectively selected. [. . . ] Please return the unit postage paid to our central service department giving a brief description of the fault: Berker GmbH & Co. [. . . ]