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Wiring
From every IR Sensor location you must “home-run” a
category 5 cable back to the MSU140. Home run means
that an individual cable is connected between each IR
Sensor and the MSU140. See Figure 4.
6
I
NFRARED
M
AIN
S
YSTEM
U
NIT
“TECH TIP”
Wire size is
expressed by it’s
AWG (American
Wire Gauge)
number. The lower
the AWG number,
the larger the wire,
i.e., 20 AWG wire is
physically larger
than 22 AWG.
IMPORTANT – AVOIDING INTERFERENCE
Avoid locating any of the cables, sensors, keypads or the
Main System Unit near any potential sources of Electro-
Magnetic Interference (EMI), such as light dimmers, speed
controls for ceiling fans, electrical ballasts, television sets,
large motors, heaters or air conditioners.
Figure 4: Home run the
sensor cable from the
sensor to the MSU140.
D
A
T
A
S
T
A
T
U
S
G
N
D
+
12
V
Remotely Located
IR Sensor
SENSORS IN
DS00329BCN-MSU140-1.qxp 8/17/05 11:26 AM Page 6