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12VDC power supply module. The 12VDC output is then connected to the <br />® motherboard. The motherboard provides six wiring posts for audio and visual alarms, <br />and the alarm circuits functional testing switches which are located on the front cover <br />alarm panel. <br />0 <br />The interface between motherboard and channel PC board is furnished with a <br />15 -contact edgecard connector. Next to each edgecard connector on the motherboard <br />are three male quick connectors marked GREEN, WHITE, and RED. These <br />connectors are to be interfaced with the sensors via the Zener Safety Barriers. Also <br />below each edgecard connector are two male connectors marked "+" and "-" to be <br />used for analog output options. <br />Mounted on the front cover alarm panel are one red color master alarm indicator, one <br />buzzer and its silence switch, one liquid alarm test switch, and one vapor alarm test <br />switch. The master visual and audible alarms can be triggered with any alarm signal <br />generated from any of the sensing channels. The source of alarm can be identified <br />with the individual channel LED indicators. The LIQUID and VAPOR test switches <br />are to be used for functional testing of the active liquid and vapor channels. <br />- 4 - <br />