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Document # 50075 Rev B 3/13/95
The UNI•COM circuit board contains a CPU, other primary components and wiring
interface connectors.
1.5.1 Power Requirements
Operating voltage for the UNI•COM must be power-limited, filtered, nonresettable
21.2 to 28.2 volts. The 24 VDC nominal operating power must be supplied by the
Control Panel and is connected to TB1 of the UNI•COM.
Note: If the UNI•COM is installed in a Unimode 200 Control Panel, power is
provided directly through UNI•COM connector J10 which plugs into the Unimode
200 main circuit board.
1.5.2 Communications
Communications between the UNI•COM and the host control panel is accomplished
over a two wire EIA-485 serial interface which is power-limited and supervised by
the control panel and the UNI•COM. The wiring connections are made to the RS+,
RS- and Shield terminals of TB1 on the UNI•COM.
The EIA-485 circuit cannot be T-Tapped and must be wired in a continuous fashion
from the control panel to the UNI•COM and, if installed, an annunciator. The wire
must be 12AWG to 18AWG twisted shielded pair cable with a Characteristic
Impedance of 120 Ohms, +/-20%. Limit the total wire resistance to 100 Ohms on the
EIA-485 circuit. Do not run cable adjacent to, or in the same conduit as 120 volts
AC service, noisy electrical circuits that are powering mechanical bells or horns,
audio circuits above 25 voltsRMS, motor control circuits, or SCR power circuits.
Note: If the UNI•COM is installed in a Unimode 200 Control Panel, the EIA-485
data line is connected directly through UNI•COM connector J10 which plugs into
the Unimode 200 main circuit board.
1.5.3 Primary and Secondary Phone Lines - Modular jacks are used to interface
the primary and secondary phone lines to the public telephone network.
1.5.4 Communicator Fail Relay Driver - Relay driver output for central station
communication failure is available.
1.5.5 Earth Ground - Connect a separate earth ground wire to TB3 terminal 1 for
transient protection. When mounted in the Unimode 200, the UNI•COM receives an
earth ground connection via a metal standoff located on the upper right corner
mounting position.
Future use.
1.5 Circuits1.6 Optional Device