TM-9-1200-215-34&P Technical Manual for M109 Automatic Fire Control System (AFCS) Download
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TM 9–1200–215–34&P 3–4 DISPLAY MODULE SWITCH PANEL J1 Figure 3–1. Display Unit Block Diagram b. The DU consists of: D Enclosure with handle (electronic housing) D Display module D Switch panel D Electrical connector D Internal wiring (1) The enclosure is a 16.5 x 13.0 x 4.5 inch cast aluminum electronic housing with an attached folding handle. The enclosure provides environmental protection to the internal components of the DU. (2) The display module is an electro–optical assembly which consists of a 4 x 8 inch thin–film electroluminescent panel, control circuitry, and a power supply. The display module is capable of 256 x 512 pixels resolution. It is capable of alpha–numeric and graphical display . The display is readable in all anticipated levels of illumination. (3) The switch panel is an electromechanical assembly which contains 23 pushbutton switches, three toggle switches, and two indicator lights. The indicator lights provide critical status information to the operator outside of the display module. The operator enters commands through the switch panel either via the keypad, cursor controls, or toggle switches. (4) The electrical connector is a standard 41 pin cylindrical connector marked J1. This connector provides the sole I/O access to the Control Unit (CU). (5) The internal wiring consists of electrical interconnection of the display module, the switch panel, and the electrical connector. This interconnection is divided into two cable assemblies. The pinouts of the cable assemblies are diagrammed in paragraph 3–10.