These devices transmit and receive alarm and control signals digital encoded on any video signal. You can insert your contact closure alarm and control signals anywhere a video signal is being transmitted, including NTSC video that has been digitally encoded. Alarm and control signals will be carried over any equipment that will pass the visual lines of video. Contact closures on the ATU-8D input will be repeated as contact closures at the ARU-8D output.

The ATU-8D ALARM TRANSMITTING UNIT and the ARU-8D ALARM RECEIVING UNIT together make up an 8 channel alarm and control system. The alarm and control signals are inserted into one visual line that is field selectable from Line 20 to Line 25. The AUT-8D blanks the video off of the selected line and inserts the contact signal information on that line. Since the contact information is now on a visual line it will pass through any digital encoding process.

Each pair of ATU-8 / ARU-8 will transmit 8 alarms. Twenty sets of units may be connected to any one video channel, allowing 160 alarms to be transmitted on one coaxial cable. The operating channel can be set by the user in the field with the internal program jumper jacks.

A system alarm will operate upon loss of power to either terminal or loss of transmission path (cable cut). In the event of power failure the video thru-put is not interrupted. An internal video sync generator takes over and maintains continuous alarm system operation in the event of video signal failure.

The system is housed in black ABS enclosures that have a UL flame rating of 94-VO and is powered by 24VAC power transformers. The system has provisions for battery back-up and LED power indicator lights to help installation.

INPUT SPECIFICATIONS

Channels8 Connectors20 Pos. Screw Terminal
Alarm Sense Contact closure (Loop)Maximum Loop Resistance 1K ohm

VIDEO INPUT

Standard NTSC (Color or B/W)
No VideoInternal Video Generator
ImpedanceHi-Z Video loop thru
Connectors2 BNC (female) Standard

MECHANICAL

Size5.50″L X 4.3″W X 3.0″D
Power24 VAC 325 mA Battery24 VDC Not IncludedARU-8

ALARM RECEIVING UNITALARM OUTPUT

SPECIFICATION

Channels8
Connectors20 Pos. Screw Terminal
Alarm ReportA Form Relay 1 Amp Max.

VIDEO INPUT

StandardNTSC (Color or B/W)ImpedanceHi-Z Video loop thru
Connector2 BNC (female) Standard

MECHANICAL
Size5.50″L x 4.3″W x 3.0″D
Power24 VAC 200 mA

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