411UD Document #50759 Rev. E 12/09/2008 P/N 50759:E
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Modes of Operation
CHAPTER 3
Modes of Operation
The 411UD digital communicator has five operational modes:
• Normal Mode
• Real Time Clock Mode
• Program Mode
• Troubleshoot Mode
• Default Mode
The operational mode for the digital communicator is Normal Mode. The operator is able to switch between any
modes of operation provided no alarm events are active in the system. It should be noted that the digital communica-
tor will not respond to input activations while in any mode except Normal Mode.
Access to any other Mode requires connection of the PRO-411 DACT Programmer which consists of a keypad and
display. Refer to Figure 3-1, “Programmer Keypad,” on page 22:
3.1
Normal Mode
Normal Mode is the standard (default) mode of operation for the 411UD digital communicator. The communicator
continuously monitors and reports to a central station, the status of the four input channels as well as the status of the
digital communicator itself. If no activity is detected on the four input channels (no shorts or opens) and the commu-
nicator is operating free of internal troubles, the digital communicator will display the following conditions:
All LEDs are off
Onboard piezo sounder is off
The relay is in its normal deactivated state
Communicator is not transmitting to the Central Station
The 411UD digital communicator transmits system status reports to a central station via the public switched tele-
phone network. Two supervised telephone line connections are made to interface the digital communicator to the
telephone lines. Both telephone lines are supervised by the 411UD for proper voltage.
The 411UD is capable of line seizure on both the primary and secondary telephone line interfaces.
Any time the digi-
tal communicator detects the necessity to call the Central Station, line seizure will disconnect any local premises
phones sharing the same telephone line. Sharing of phone lines, for fire systems, must be approved by the Local
Authority Having Jurisdiction.
All transmissions to the Central Station will be sent over the Primary phone line. In
the event of a noisy or faulty phone line, transmissions will be sent over the backup Secondary phone line.
Transmission options exist to:
• send reports to the secondary phone number as backup only
• send reports to both the primary and secondary phone numbers
• send reports to the first available central station phone number
If 10 total attempts to communicate are unsuccessful, the digital communicator will turn on the Communication Fail
LED.
The 411UD meets NFPA 72 requirements for Remote Station Protective Signaling Service and Central Station Sig-
naling Service reporting requirements for: (a) the type of signal, (b) condition and (c) location of the reporting
premises. See “Central Station Communications” on page 40, for additional information.
