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Document # 50049 Rev D 5/2/97 P/N 50049:D
Figure 4-1: UDACT-F Phone Connectors and LEDs
4.1.3 Normal Mode Operation: Normal mode is the standard mode of operation. In
this mode, the UDACT-F monitors host FACP status, power input, EIA-485
communications and telephone line voltage.
The four character 7-segment display is normally off and does not annunciate events
that are being transmitted. The display will only annunciate UDACT-F trouble
conditions in the normal mode.
The UDACT-F transmits zone/point and system status reports to a Central Station via
the public switched telephone network. Two supervised telephone line connections
are made to interface the UDACT-F to the telephone lines.
The UDACT-F 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, the 4 character display will show either 'no 1' or 'no
2' (depending upon which telephone line has the fault. 'no 1' = Primary Line, 'no 2' =
Secondary Line) and the trouble condition will be reported to the Central Station
over the remaining good phone line.
The UDACT-F comes with line seizure capability provided for both the primary and
secondary telephone line interfaces. Any time that the UDACT-F needs to make a
call to the Central Station, line seizure will disconnect any local premises phones
sharing the same telephone line.
All transmission to the Central Station will be sent over the Primary phone line. In
the event of noisy phone lines, transmissions will be sent over the backup Secondary
phone line.
Kiss-Off
LED
Secondary
Active
LED
Modem
LED
Primary Active
Primary
Line
Secondary
Line
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