411UDAC Document #51073 Rev. D 12/09/2008 P/N 51073:D 13
Controls and Indicators
1.4 Controls and Indicators
Front Panel Switch
• Reset Switch - to reset 411UDAC circuits
• Acknowledge/System Silence Switch
press once to acknowledge alarm or trouble (silence local 411UDAC piezo sounder and change all
flashing LEDs to steady on)
press a second time and hold for minimum of two seconds to perform a System Signal Silence (silence
Notification Appliance Circuit)
411UDAC Piezo Sounder
• The 411UDAC piezo sounder is used to locally annunciate DACT alarms and troubles. DACT troubles
include input channel open circuit, NAC fault, phone line 1 or 2 voltage fault, phone number 1 or 2
communication fault and total communication failure. Separate and distinct sounds are provided for the
following conditions:
alarm - steady On
trouble - 1 second On and 1 second Off
supervisory - ½ second On and ½ second Off
Front Panel Indicator
• AC Power - green LED
• Input Active - green LED
• Communication Fail - yellow LED
• System Trouble - yellow LED
• Supervisory - yellow LED
• Battery Trouble - yellow LED
Circuit Board Indicator
• Earth Fault - yellow LED (indicates zero impedance between panel and earth ground)
FIGURE 1-3:411UDAC Controls and Indicators
411ACDSP.CDR
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