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Appendix E: Burglar Alarm System Integration
The outdoor cameras in the SCNC36xx series have additional connectors to
help with integration of the cameras into a complete burglar alarm system.
1: GND: Signal ground for use with DI
2: DI: Digital Input (use with GND)
3: DO: Digital Output (open collector)
4: Power + 12 VDC (MAX 0.4 A)
Typically this type of wiring is carried out by a professional security system
installer. If you are not familiar with the terminology used here, please do not
attempt to connect anything to this terminal block. Damage caused by
improper wiring is not covered by warranty.
When the camera senses motion, and if the digital output is set to “Enable” in
the camera’s “Digital I/O Setup” menu, it activates the digital output to trigger
a burglar system. With a maximum load of 1 Amp and a maximum voltage of
60 V, this output has an open collector NPN Darlington transistor with the
emitter connected to the GND pin. If used with an external relay a reverse
polarity diode must be connected in parallel with the relay coil to protect
against voltage transients. You would need to select a relay that uses less than
0.4A at 12V, and the relay and the diode would connect to pins 3 and 4.
Conversely, if the digital input is set to “Enable” in the camera’s “Digital I/O
Setup” menu, a contact closure from DI to GND (pins 1 and 2) would trigger an
alarm condition in the camera as if the camera’s own motion detection had
triggered. This means that emails or FTP/HTTP uploads can be triggered or
recording to MicroSD card can be initiated. Both the digital input and the
camera’s motion detection can be active at the same time. If you only want
this external input to trigger the camera’s alarms, you need to set all 4 motion
detection windows in the “Motion Detection” menu to Disable (unchecked).
The round connector that looks similar to the power plug is for optional
attachment of an amplified speaker system. This output is at line level similar
to a computer speaker system. Using this, audio upload can be initiated from
the microphone of a computer running Internet Explorer. There is no echo
suppression, so if this is used it would make sense to turn down the camera’s
own microphone.