PIN 7. EXTERNAL ALARM NC
Under normal operation, COM connects with NC and disconnects with NO. When the alarm is triggered, COM disconnects with NC, and connects with NO.
PIN 8. EXTERNAL ALARM NO
Under normal operation, COM will disconnect from NO. When the alarm is triggered, COM will connect with NO.
PIN 9. GND
GROUND
PIN 10. RS485-B
The DVR can be controlled remotely by an external device or control system, such as a control keyboard, using the RS485 serial communication signals.
PIN 11. RS485-A
The DVR can be controlled remotely by an external device or control system, such as a control keyboard, using the RS485 serial communication signals.
PIN 12. DISK FULL (OUTPUT)
When the HDD is full, it sends a signal to trigger the next DVR record mode, if you install another DVR. Under normal operation, the signal remains “High”. When the disk is full, the DVR will send a “Low” signal.
PIN 14. ALARM RESET (INPUT)
Connect a wire from the ALARM RESET (PIN 14) to the GND (PIN 9) connector, so it can disable the ALARM. An external signal to the ALARM RESET (PIN 14) can be used to reset both the ALARM OUTPUT signal and DVR’s internal buzzer. When the alarm has been triggered, the signal becomes “Low”, and will stop all alarm activity. Under normal operation, the signal remains “High”.
PIN 15. EXTERNAL ALARM COM
Under normal operation, COM connects with NC and disconnects with NO. When the alarm is triggered, COM disconnects with NC, and connects with NO.