Central Station Communications
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411UD Document #50759 Rev. E 12/09/2008 P/N 50759:E
CHAPTER 4 Central Station Communications
The 411UD digital communicator transmits system status reports to Central Stations via the public switched tele-
phone network. Two supervised telephone line connections are made to interface the communicator to the telephone
lines. Two 7-foot telephone cords P/N MCBL-7 may be used for this purpose (not supplied - order separately).
The digital communicator supervises both telephone lines for proper voltage. A delay of two minutes will occur
before a fault in either phone line connection is reported as a trouble. When a fault is detected, an audible trouble sig-
nal will sound, the yellow DACT Trouble LED will turn on, the trouble relay will activate if programmed for DACT
trouble and the trouble condition will be reported to a central station over the remaining good phone line.
The digital communicator comes with line seizure capability provided for both the primary and secondary telephone
line interfaces. Any time that the DACT needs to make a call to a central station, line seizure will disconnect any
local premises phones sharing the same telephone line. All transmissions to central stations will be sent over the Pri-
mary Central Station phone line. In the event of noisy phone lines, transmissions will be sent over the backup Sec-
ondary phone line.
Two phone numbers must be programmed, the Primary Central Station phone number and the Secondary Central Sta-
tion phone number. There are three options for transmission to the Central Station:
• All reports are always sent to the Primary Central Station phone number with the Secondary Central Station
number for emergency backup purposes only
• All reports are sent to both Central Station phone numbers
• Reports are sent to the first available Central Station phone number only
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