Pelco C2900M-B(1/03 manual Connecting External Sensors, NET 104A

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.

NET 104A

VIDEO1

VIDEO2

VIDEO3

VIDEO4

AUDIO

ALARM

ALARM

INPUTS

OUTPUTS

COM

5

1

2

3

4

+5V

1

2

3

4

POWER

IN

OUT

+

+

+

+

75 OHM ON

GND

GND

RS232/422/485

10/100 BASE-T

12V~0.8A

ACTIVE

HIGH

+5V

ACTIVE

LOW +5V

ALARM						ALARM
INPUTS					OUTPUTS
5	1	2	3	4 +5V	1	2	3	4
OUT	+	+	+	+

GNDGND

Figure 21. Alarm Connections

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.

C2900M-B (1/03) 33