Supervised Alarm Input Configuration and Wiring
Supervised mode activates an alarm if the current in a line falls outside a specified range. This blocks an attempt to defeat the alarm system by cutting a wire or through bypassing or shorting a section of the circuit.
If the whole system is in supervised mode, then all inputs (including unused inputs) must be terminated with 10K resistors (not included).
•If you want the alarm contacts to be N.O., then wire the terminating resistor in parallel with the alarm contacts.
•If you want N.C., then wire the resistor in series.
Refer to Figure 7.
SWITCH SETTINGS
SUPERVISED (NTSC)
1 2 3 4
NTSC/PAL
NOT USED
NO ALARM
NORMALLY CLOSED
+V
ALM
UNIT
GND
NO ALARM
NORMALLY OPEN
+V
ALM
UNIT
GND
SUPERVISED MODE CONSIDERATIONS
INDIVIDUAL ALARM WIRING CONDITIONS
| NORMAL |
|
|
|
| ALARM CONDITION |
|
| ALARM CONDITION |
| +V |
| +V |
|
10K | ALM | 10K | ALM | 10K |
| UNIT |
| UNIT |
|
| GND |
| GND |
|
|
|
|
| CUT WIRE |
| NORMAL |
|
|
|
| ALARM CONDITION |
|
| ALARM CONDITION |
| +V |
| +V |
|
10K | ALM | 10K | ALM | 10K |
| UNIT |
| UNIT |
|
| GND |
| GND |
|
|
|
|
| CUT WIRE |
SUPERVISED, GROUP ALARM WIRING CONDITIONS
SUPERVISED, NORMALLY OPEN
1 |
|
2 | 10K |
3 |
|
4 | 10K |
5 |
|
6 | 10K |
7 |
|
8 | 10K |
SUPERVISED, NORMALLY CLOSED
1 |
|
2 | 10K |
3 |
|
4 | 10K |
5 |
|
6 | 10K |
7 |
|
8 | 10K |
Figure 7. Supervised Alarm Input Wiring
Pelco Manual | 21 |
