Appendix #2 - Pin Configuration - Velleman DVR4MQAEE User Manual

13. Appendix #2 – PIN Configuration
PIN 1: RS232-TX
DVR can be remotely controlled by an external device or control system, such as a control keyboard, using RS-232
serial communication signals.
PIN 2: RS232-RX
DVR can be remotely controlled by an external device or
control system, such as a control keyboard, using RS-232 serial
communication signals.
PIN 3. ~ PIN 6: ALARM INPUT
When connecting the wire from the ALARM INPUT (PIN 3 -- 5)
to GND (PIN 9) connector, the DVR will start recording and the
buzzer will be on. When the alarm input signal is "Low", the unit
starts to record and buzz. When Menu / Camera / Alarm is set
to "High", the unit starts to record and buzz.
PIN 7: EXTERNAL ALARM NC
Under normal operation, the COM connects with NC and disconnects from NO. When the alarm is triggered, COM
disconnects from NC and connects with NO.
PIN 8: EXTERNAL ALARM NO
Under normal operation, the COM disconnects from NO. When the alarm is triggered, the COM connects with NO.
PIN 9: GND
Signal GND.
PIN 10: RS485-B
The DVR can be remotely controlled by an external device or control system, such as a control keyboard, using
RS485 serial communication signals.
PIN 11: RS485-A
The DVR can be remotely controlled by an external device or control system, such as a control keyboard, using
RS485 serial communication signals.
PIN 12 ~ PIN 14: PIN OFF
PIN 14: ALARM RESET
When connecting the wire from ALARM RESET (PIN 14) to GND (PIN 9) connector, it can disable ALARM. An
external signal to ALARM RESET (PIN 14) can be used to reset both ALARM OUTPUT signal and the DVR's internal
buzzer. When alarm has been triggered, signal becomes "Low" and it will stop all alarm activities. Under normal
operation, signal remains "High".
PIN 15: EXTERNAL ALARM COM
Under normal operation, the COM disconnects from NO. When the alarm is triggered, the COM connects with NO.
PIN 16 +17: GND
Earth GND
DVR4MQAEE_v5 VELLEMAN
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