47
Document # 50075 Rev B 3/13/95
Install 120 ohm
EOL resistor (P/N:
71244) on TB1
terminals 3 & 4 if
last or only device
on EIA-485 line.
P/N 29090
Supervised and Power
Limited EIA-485 and
power connections
Solid Earth
Ground
Connection
To Phone
Lines
(Supervised)
UNI•COM in ADT-ABS8RF
(Shown with cover removed)
Unimode 4-16
Appendix E: Unimode 4-16The UNI•COM is capable of reporting a maximum of 56 zones when used with the Unimode 4-16.
The UNI•COM reports alarms and troubles on inputs and reports only troubles on outputs. Beware of
'gaps' in the reporting of input circuits. The gaps depend upon the mounting location and FACP
configuration. The Unimode 4-16 has a maximum of 16 inputs.
The UNI•COM must be mounted remotely in an ADT-ABS8RF or ADT-UBS1F enclosure and may be
placed up to 6000 feet away from the control panel. All power must be removed from the control panel
before making any connections to prevent circuit damage. The EIA-485 serial interface is connected
between the control panel and UNI•COM using twisted, shielded pair wire. Power should be wired
from the control panel's main power supply (MPS-24BPCA) 24 VDC (nominal) filtered power supply
output to TB1 on the UNI•COM.
Notes:
2) Ferrite cores are recommended for all applications.
3) Recommended wire is 12 AWG to 18 AWG twisted pair.
4) Shielded wire is not required (unless mandated by local AHJ).
If shielded wire is used, connect only one end of shield:
a) shield may be connected to cabinet (earth ground) at fire alarm panel, or
b) shield may be connected to TB1 Terminal 5 (Shield) at UNI•COM as shown in
Figure E-2.
NOTE: The shield end that is not connected should be insulated to prevent
accidental grounding. Do not connect both ends of shield under any circumstance
since a ground fault may result.
5) Conduit is recommended for external wire runs. Consult local building codes.
6) Connect Ground Strap (supplied with ADT-ABS8RF enclosure) from Earth Ground terminal on
UNI•COM to a solid building earth ground. Conduit alone will not provide a reliable earth ground.
7) UNI•COM may be located up to 6000 feet away from the host control panel.
8) Refer to Specifications for power requirements.