The SECTOR REGISTER consists of threepushbutton/indicators. The register displays the sectornumber of the 60-degree sector in which the rotor islocated. The pushbuttons may be used to simulate asector angle. The eight pushbutton/indicators of theRATIO REGISTER indicate or simulate the binary ratioangle.The +REF/OFF/-REF toggle switch allowsselection of positive (+REF) or negative (-REF)reference voltage. The switch is set to the OFF positionfor normal operations. The OSCILLATORpotentiometer is used to vary the frequency of the S/Dconverter test circuits from 2 to 100 Hz. With theHIGH/LOW toggle switch in the HIGH position, theS/l) converter is enabled for continuous recycling whenin the test mode. When the switch is in the LOWposition, the recycling rate can be varied from 2 to 100conversions a second using the OSCILLATORpotentiometer.The OUTPUT REGISTER has 15 pushbutton/indicators and a clear pushbutton. The registerindicates the 15-bit BAM output of the S/D converter.Each bit-position indicator equates to a degree valueportion of the summed synchro-mechanical angle.TOPIC 3—SWITCHBOARDSShipboard tactical data system devices areinterconnected with each other and with equipmentsin other shipboard subsystems through switch-boards. Combat systems use two major types ofswitchboards: digital switchboards and analogswitchboards.Digital switchboards primarily interconnect digitaldevices. These types of interfaces include computer-to-computer interfaces and computer-to-peripheraldevices and other serial or parallel digital inter-faces.Analog switchboards provide the interconnectionfor analog devices and signals including control andstatus signals, synchro signals, and linear signals. Inaddition, analog switchboards provide supply andreturn voltages and reference voltages for analog signalexchanges. Most current shipboard combat directionsystems use a combination of analog and digitalswitchboards to completely interface CDS equipmentswith each other and with other shipboard sub-systems.DIGITAL SWITCHBOARDSThe two basic types of shipboard digitalswitchboards are manual switchboards and remotelyFigure 13-15.—Sample manual switching configuration.controlled switchboards.Manual switchboards are made up of variableconfigurations of three-position or five-positionswitches (figure 13-14). Each switch must be manuallypositioned for the interconnection required by thecurrent system configuration. At least two manualswitches, one for input and one for output, are requiredfor each I/O device or computer channel to allow for thecomplete range of system configuration requirements(figure 13-15). Manual switchboards are for the mostpart being replaced by remotely controlledswitchboards.13-25
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