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C2900M-B (1/03) 33
CONNECTING EXTERNAL SENSORS
The unit has four alarm inputs that let you connect external signaling devices, like door contacts or
motion detectors. If configured accordingly, an alarm trigger can, for example, set up an automatic
connection between NET104A and the remote station. You can connect switches or contacts
directly without a separate power supply.
Connection INPUT 5 is a master alarm. This connection lets you activate or bar (for example, by
means of a key-operated switch) all the alarm triggers.
NOTE: Do not connect the ground terminals to earth ground. External switching voltage must not
exceed 12 VDC.
The four alarm inputs are optically isolated from the other components of the NET104A via
optocouplers and require a voltage of 5-12 VDC for switching.
Do the following to connect external sensors. Refer to Figure 21.
1. Pull the terminal block INPUTS from its plug-in base.
2. Attach the conductors to the alarm input and ground terminals. (Push a small screwdriver or
similar instrument into the square opening. This opens the circular opening. Insert the wire into
the circular opening, and then remove the screwdriver.)
3. Push the terminal block back on to the plug-in base.
GND GND
V
IDEO1
V
IDEO2
V
IDEO3
75 HM N
OO
V
IDEO4
A
UDIO
I
N
O
UT
A
LARM
I
NPUTS
A
LARM
O
UTPUTS
51234
+5V
1234
++++
C
OM
P
OWER
RS232/422/485 10/100 BASE-T
12V~0.8A
GND
GND
O
UT
A
LARM
I
NPUTS
A
LARM
O
UTPUTS
51234
+5V
1234
++++
+5V
NET 104A
A
CTIVE
HIGH
ACTIVE
LOW
+5V
Figure 21. Alarm Connections