Advanced Global Technology Alarm Interconnection on the QSP-660, Typical Alarm Connections

AdvancedTechnologyVideo,Inc.

ALARM INTERCONNECTION ON THE QSP-660
		1K Ohm
The alarm connector on the back panel allows input of four external
		1: Alarm #1
control signals to affect the behavior of the real time quad under
alarm conditions. Alarm inputs are provided for each camera. A		2: Alarm #2
picture freeze input is also provided to allow the picture to be frozen.		3: Alarm #3
These inputs are normally generated by a switch located at a door,
window, or other point in the installation where a camera is		4: Alarm #4
monitoring activity. Many installations use an open switch that
requires a switch closure to activate the alarm. As part of the QSP-
660’s normal alarm video processing, an alarm output is generated		10: Picture freeze
on the same back panel connector. In addition to the alarm inputs, a
		100 Ohm
picture freeze input is also provided. While picture freeze is	+5V
activated, any present camera image is retained on the display and		13: Alarm out pwr
new video information is ignored. A picture freeze does not trigger		100 Ohm
the alarm output.		15: Alarm ground
Alarm inputs contain series resistors for ESD (Electro Static		9: Alarm output
Discharge) and lightning damage protection. The outputs also		(50 mA maximum)
contain series resistors to limit output current to prevent damage to
the QSP-660 in the occurrence of shorting out the output pin.
Note: When connecting the inputs and outputs up		QSP-660 Alarm Port Internal
		Electrical Equivalent
to other equipment, consideration should be given
to the limitations introduced by these current-
limiting resistors.

The alarm connector on the QSP-660 is a DB-15,

15-pin connector. For ease of installation, a breakout adapter is provided with the 16th terminal connected to chassis ground. A simple alarm connection is shown to the right using the QSP-660 alarm breakout adapter. In the example to the right, switches are connected directly to the alarm inputs, and a single output is connected to some signaling device or to a controlled piece of equipment. In this case, an external resistor is required to pull the output up to +5V (High) indicating a non-alarm condition.

The external resistor makes connection to higher voltage systems possible, such as a 12 VDC automobile system. In this application, the pull-up resistor is not tied to the QSP-660 +5V pin, but to the higher voltage system. Voltages greater than +5V must not exceed 30 VDC and the current through the output pin must not exceed 50 mA.

Failure to remain within the 30 VDC and 50 mA restriction could damage either the QSP-660, the output signaling device, or both.

	Typical Alarm Connections
	using the Breakout Adapter
	Alarm Switches
1	OPEN = no alarm
	CLOSED = alarm activate
9
	1KOhm
	Alarm Output
	(To indicator, VCR, etc.)
16	+5V = High = no alarm
	0V = Low = alarm activated
1
	+Vsupply (30VDC, 50mA max)
	Alarm Output
	Vout = High = no alarm
9	0V = Low = alarm activated

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QSP-660: Instructions for Basic Operation and Installation Page 18