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Document 50934 Rev B 5/15/00 PN 50934:B
64
ADT-MNNA
(Supervised)
To Phone
Lines
Solid Earth Ground Connection
Install 120 ohm EOL resistor (P/N:71244)
across terminals 3 & 4 if last or only
device on EIA-485 line. Note that
Terminals 6 & 7 are not used at this time.
Notes:
1) Ferrite cores are recommended for all applications.
2) Recommended wire is 12 AWG to 18 AWG twisted pair.
3) 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 ADT-UDACT.
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.
4) Conduit is recommended for external wire runs. Consult local building codes.
5) Connect Ground Strap (supplied with ADT-ABS8RF enclosure) from Earth Ground terminal on ADT-
UDACT to a solid building earth ground. Conduit alone will not provide a reliable earth ground.
6) ADT-UDACT may be located up to 6,000 feet away from the host control panel.
7) Refer to Specifications for power requirements.
Figure F-2: EIA-485 Connection to Remote ADT-UDACT
ADT-UDACT in ADT-ABS8RF
(Shown with cover removed)
ADT-MNNA cabinet
DO NOT USE
ina-absu.WMF