Pelco C690M-E operation manual Alarm

UNSUPERVISED, NORMALLY CLOSED

IN THIS CONFIGURATION, TRANSISTOR "S" (THE SWITCH) IS BIASED FOR CONDUCTION AND POINT "A" RESIDES CLOSE TO 0V. IF THE TRANSISTOR IS BIASED TO THE OFF STATE OR IF THE LINE IS CUT TO STOP CURRENT FLOW, POINT "A" RISES TOWARD 5V AND AN ALARM CONDITION.

NOTE: PIN NUMBERS REFER TO TYPICAL HEADER ALARM INPUT NUMBERS ON MATING PLUGS

NOTE: TIME DURATION OF THE INPUT CONTROL SIGNAL MUST

	+5V	INPUT
		VOLTAGE
		A L A R M
	2.5V
		STAND-BY MODE
POINT A	0V	TIME

BE 50ms OR MORE

_<50ms

HIGH = STAND-BY MODE LOW = ALARM

ALARM WIRING SIDE

POINT A

PIN 1

PIN 2

S

EQUIPMENT SIDE

+5V

10K

100K

0.1uF 0.1uF

Processor

CIRCUITRY

TTL-CMOS

10K

GNDGND

EXTERNAL

CONTROL

GND

	NORMAL
GND	CURRENT FL0W
	NO ALARM

UNSUPERVISED, NORMALLY OPEN

IN THIS CONFIGURATION, TRANSISTOR "S" (THE SWITCH) IS BIASED FOR NON- CONDUCTION AND POINT "A" RESIDES CLOSE TO 5V. IF AN INPUT CONTROL SIGNAL OF SUFFICIENT DURATION TURNS ON THE TRANSISTOR FOR ALARM ACTIVATION OR IF THE LINE IS SHORTED, POINT "A" WILL FALL TOWARD 0V AND AN ALARM CONDITION.

NOTE: PIN NUMBERS REFER TO TYPICAL HEADER ALARM INPUT NUMBERS ON MATING PLUGS

NOTE: TIME DURATION OF THE INPUT CONTROL SIGNAL MUST

+5V	INPUT
	VOLTAGE
POINT A
	STAND-BY MODE
2.5V
	A L A R M
0V	TIME

BE 50ms OR MORE

_<50ms

HIGH = ALARM

LOW = STAND-BY MODE

ALARM WIRING SIDE

POINT A

PIN 1

PIN 2

S

EQUIPMENT SIDE

+5V

10K

100K

0.1uF 0.1uF

Processor

CIRCUITRY

TTL-CMOS

10K

GNDGND

EXTERNAL

CONTROL

GND

	NORMAL
GND	CURRENT FL0W
	NO ALARM

Figure 8b. Unsupervised Alarm Operation

Pelco Manual C690M-E (11/04) 23