Kentrox DataSMART T3/E3 IDSU, Installation Manual, Page: 24 / 52

24 Chapter 3: Initial installation and power up
Using the alarm relay
The DataSMART T3/E3 IDSU provides an external alarm relay switch that you can use to
trigger an external alarm device. This switch provides normally-open and
normally-closed positions.
Wire the alarm relay as follows:
1 Prepare three 14 to 22 AWG (1.63 to 0.64 mm) wires to terminate in the alarm relay
plug. Strip 0.125 in. (3.2 mm) of the insulation from the plug end of each wire. Do
not strip more than 0.25 in. (6.4 mm).
2 Connect the COMM wire to position 2 of the plug.
3 Connect the N (normally open) wire to position 3 of the plug.
4 Connect the NC (normally closed) wire to position 1 of the plug.
Alarm relay output must be enabled through the user interface, once you have connected a
control device. Use the EAR command.
The ACO button on the front-panel is used to cutoff the external alarm relay once it has
been triggered.
PLCP
TA
CA RXD TXD
DATA PORT
NEI FEI XMT RCV
ALARM
ACO
FEL SEND
LOOP
ACTV
0RS
T
1RLLB 2RP
L
B
4LLB 5P
LB
6LO
C
7DT
L
B
ACO button