ADT Security Services ADT-UDACT 1.5 Circuits, 1.6 Optional Device

Document 50934 Rev B 5/15/00 PN 50934:B
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• For tone burst or touchtone type formats: Discern proper 'Ack' and 'Kiss-off'
tone(s) - The frequency and time duration of the tone(s) varies with the
transmission format. The ADT-UDACT will adjust accordingly.
• Communicate in the following formats (refer to Section 6.0 for compatible
receivers):
✓6 Tone Burst Types: 20 pps
(3+1, 4+1, 4+2)
✓ 3 Touchtone Types:
4 + 1 Ademco Express
4 + 2 Ademco Express
Ademco Contact ID
The ADT-UDACT circuit board contains a CPU, other primary components and
wiring interface connectors.
1.5.1 Power Requirements
Operating voltage for the ADT-UDACT 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 ADT-UDACT.
1.5.2 Communications
Communications between the ADT-UDACT 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 ADT-UDACT. The wiring connections are
made to the RS+, RS- and Shield terminals of TB1 on the ADT-UDACT.
The EIA-485 circuit cannot be T-Tapped and must be wired in a continuous fashion
from the control panel to the ADT-UDACT and, if installed, annunciators. 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.
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
An earth ground connection to the ADT-UDACT is required for transient protection.
One option allows connection via TB3 terminal 1. A second option allows
connection via the upper right corner mounting hole. Using a metal standoff and
screws, attach to grounded metal cabinet.
Future Use.
1.5 Circuits
1.6 Optional Device