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Circuits
1.3
Circuits
The 411UDAC circuit board utilizes surface mount technology and contains a MicroController Unit (MCU), dual
modular phone line jacks, piezo sounder, two sockets for optional programmable relays and connectors for input, out-
put and power wiring. A piezo silence switch and reset switch are provided on the membrane panel which plugs into
connector J7 on the main circuit board.
1.3.1 Channels/Inputs
Four input channels are provided on the 411UDAC. The 411UDAC can be used to monitor a host FACP (Fire
Alarm Control Panel) in Slave Mode or as a stand-alone FAC (Fire Alarm Communicator). Each input can be
programmed to monitor the following conditions:
• fire alarm activation
• 2-wire smoke (channels 1 & 3 only)
• pull station
• normally open contact device
• waterflow
• process monitoring activation
• trouble activation
• fire supervisory activation
1.3.2 Notification Appliance Circuit
One Style B NAC (Notification Appliance Circuit) requiring a 2.2K ohm End-of-Line resistor. This NAC can
only be used to supplement host panel NACs.
1.3.3 Output Circuits
• Modular jacks are used to interface the primary and secondary phone lines to the public telephone network.
Phone lines are fully supervised at all times (if communication is enabled).
• 12 volt resettable power output (200 mA)
• 12 volt battery charger will charge up to 14 AH batteries
1.3.4 Auxiliary Relays (optional)
Two optional dry Form-C relays (P/N: 411RK), with contacts rated for 2.0 amps @ 30 VDC (resistive) or 0.5
amps @ 30 VAC (resistive), can be installed on the main circuit board. Each relay is programmable for:
Alarm
Fire supervisory - latching
Fire supervisory - autoresettable
Process monitor - latching
Process monitor - autoresettable
Host panel trouble
DACT trouble
Total communications failure
1.3.5 Earth Ground
Connect a separate earth ground wire to TB3 terminal 4 (Earth) for transient protection.
10
Document #51073
Rev.A
1/19/99
P/N 51073:A
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