MPC-1000 Plus Fire Alarm System Control Unit Owner's ... - Faraday

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12120 OWNER'S MANUALRS485 COMMUNICATIONS CIRCUITThe RS485 communication circuit can address up to 16 standard annunciators and/or 8 remoteprocessors to drive graphic annunciation or relay modules. Devices on the circuit may be connected upto 4000 feet from the control unit. At the top of the main board the terminal blocks are used for theconnection of remote serial devices.Serial Interface Circuit24VDC nominal, 0.4A max.Wire Resistance-25 ohms/line (4000’ max)Wire Type-Twisted Pair for dataSupervised, Power LimitedSee Owner’s Manual for Compatible Dev icesRemote Device PowerWhen connecting devices on the RS485 communications circuit, a limited amount of current is availablefrom the control unit. If more current supply is required for the connected devices, auxiliary power mustbe provided to each insufficiently powered device. Each address on the circuit must be fully poweredfrom either control unit or auxiliary power (no combined source can be configured).Remote Device DataWhen connecting devices on the RS485 communications circuit, the data wires must be daisy chainedand with no T-taps to preserve the integrity of the data. Each end (two places) must be terminated with a120 ohm termination resistor. The following diagrams show the proper wiring.P/N 447192 Issue I (preliminary 10/31/2001) V-5
12120 OWNER'S MANUALADDRESSABLE DEVICE CIRCUITThe basic configuration of the 12120 control unit includes one addressable device circuit. The control unitcan be programmed for operation with <strong>Faraday</strong> or <strong>System</strong> Sensor addressable devices. These are polledby the control unit every few seconds and input or output functions communicated to determine devicestatus or function. The control unit monitors all device addresses for alarm and trouble conditions.Addressable Device CircuitStyle 4 or 6/7 Operation(set jumper P1 for proper style)24VDC nominalWire Resistance-20 ohms/lineSupervised, Power LimitedSee Owner’s Manual for Compatible DevicesStyle6/74Addressable Device Wiring DiagramsProper connections for UL Listed compatible addressable devices are indicated below. Refer also to theinstruction sheets packed with each device.Sensors and modules may be wired together according to several NFPA defined wiring styles. The wiringstyle that is appropriate for your installation should be determined from the relevant building codes andthe Authority Having Jurisdiction.P/N 447192 Issue I (preliminary 10/31/2001) V-6
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