
NV-DVR900 / NV-DVR1600 ver. 2.0 - User’s Manual
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ALARM CONNECTIONS
9. ALARM CONNECTIONS
Digital Multiplexers NV-DVR900 and NV-DVR1600 feature accordingly 9 and 16 alarm inputs
allowing to connect external devices. Joints for cables connection are equipped in convenient
removable screw joints terminals. The first pin from the left side in the first joint is a ground pin (G)
following pins are alarm inputs 1...8. Similar in the second joint the first pin from the left side
is a ground pin (G) following pins are alarm inputs 9...16.
The inputs operate in TTL standard for this reason appropriate current capacity voltage creating for
each input circuit like shown on the diagram below. Alarm input activation occurs when low logic state
on the alarm input is detected.
Warning: Both alarm inputs and alarm relays are not protected against lightings and current
rushes on power supply. User should provide appropriate surge protection devices.
Sensor 1
G
External coupler
(e.g. reed relay)
Multiplexer
1k
1k
Ground
Ground
External circuit
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