Pelco C690M-E operation manual Supervised Alarm Input Configuration and Wiring

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 C690M-E (11/04) 21