Figure 2-2: Relay Driver Connections - ADT -UDACT Product Information

Adt digital alarm communicator transmitter installation operation manual

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Table Of Contents

Table of Contents

Relay Driver

The ADT-UDACT's open collector output on TB3, terminal 2 is provided for

Communicator Failure and ADT-UDACT trouble. It can be used to drive UL listed

relay MR-101/C or MR-201/C. The output is rated for 40 mA. The normal condition

for the output is Off (deenergized).

Communicator Failure occurs when the maximum number of attempts to reach both

central stations has taken place or when both phone lines are disconnected. ADT-

UDACT trouble conditions include loss of telephone line voltage to the primary and/

or secondary phone lines, communication failure to the primary or secondary central

stations, total communication failure, entry into program, type and troubleshoot

modes.

Wiring from the ADT-UDACT terminal TB3 to the relay must be in the same room

no more than 20 feet in length and enclosed in conduit. Wiring from the relay output

contacts must remain in the same room as the ADT-UDACT.

When the ADT-UDACT is programmed for 'Receive Only' (typically this occurs

when annunciators are also used and are set for 'Receive/Transmit'), the relay output

is used to provide a ADT-UDACT trouble input to the host control panel. For

Unimode 2020/1010 applications, use a monitor module to supervise the relay

closure. Refer to Figure 2.3. Program the custom label field to read 'UDACT

Trouble'.

When the ADT-UDACT is programmed for 'Receive/Transmit', EIA-485 supervision

and ADT-UDACT trouble status are automatically handled by the host control panel.

The relay output may, however, be used for ADT-UDACT communications failure if

desired.

TB3

Earth Gnd

Comm Fail

+24 VDC

All wiring to relay

must be in the same

room within 20 feet

of ADT-UDACT and

in conduit.

TB3

Earth Gnd

Comm Fail

+24 VDC

* Note: The MR-101/C and MR-201/C include an enclosure.