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Document 50934 Rev B 5/15/00 PN 50934:B
15
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.
Figure 2-2: Relay Driver Connections
Earth Gnd
Comm Fail
+24 VDC
Earth Gnd
Comm Fail
+24 VDC
TB3
TB3
* Note: The MR-101/C and MR-201/C include an enclosure.
MR-101/C *
MR-201/C *
Relay Energized LED
SPDT Contacts
10 Amps
@ 115 VAC
Connections must be
in same room as
ADT-UDACT
DPDT Contacts
10 Amps
@ 115 VAC
Relay Energized LED
All wiring to relay
must be in the same
room within 20 feet
of ADT-UDACT and
in conduit.
UDACTTB3.EPS