PIN 19. ALARM INPUT 15
Used to connect an alarm sensor between ALARM INPUT 15 (PIN 19) and GND (PIN 1) to trigger an alarm on Camera 15 which can activate the internal audible alarm and start recording.
PIN 20. ALARM INPUT 13
Used to connect an alarm sensor between ALARM INPUT 13 (PIN 20) and GND (PIN 1) to trigger an alarm on Camera 13 which can activate the internal audible alarm and start recording.
PIN 21. ALARM INPUT 11
Used to connect an alarm sensor between ALARM INPUT 11 (PIN 21) and GND (PIN 1) to trigger an alarm on Camera 11 which can activate the internal audible alarm and start recording.
PIN 22. ALARM INPUT 9
Used to connect an alarm sensor between ALARM INPUT 9 (PIN 22) and GND (PIN 1) to trigger an alarm on Camera 9 which can activate the internal audible alarm and start recording.
PIN 23. RS232-RX
The DVR can be controlled remotely by an external device or control system, such as a control keyboard, using RS- 232 serial communications signals.
PIN 24. RS485-B
The DVR can be controlled remotely by an external device or control system, such as a control keyboard, using RS485 serial communications signals.
PIN 25. EXTERNAL ALARM COM
Under normal operation COM disconnect with NO. But when alarm triggered, COM connect with NO.
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