Operation - Velleman DVR4MQA Handbuch

25-pin COM port
PIN 1: RS232-TX + PIN 2: RS232-RX: This device can be controlled remotely by an external device or control
system, such as a control keyboard, using RS-232 serial communications signals.
PIN 3/4/5/6: ALARM INPUT 1/2/3/4: By connecting these pins to GND (pin 9), the DVR4MQA will start recording and
the buzzer will be on. Triggering depends on the set level (high/low) under Menu/Camera/Alarm.
PIN 7: EXTERNAL ALARM NC + PIN 8: EXT. ALARM NO: During normal functioning COM is connected with NC
and not with NO. When there is an alarm trigger, COM disconnects from NC and connects with NO.
PIN 9: GND: GROUND
PIN 10: RS485-B + PIN 11: RS485-A: This device can be controlled remotely by an external device or control
system, such as a control keyboard, using RS-485 serial communications signals.
PIN 12: DISK FULL: When the HDD is full, it sends a trigger signal to a possible next DVR4MQA. Normally this
signal is high ; when the disk is full it becomes low.
PIN 14: ALARM RESET: An alarm can be disabled by connecting pin 14 to pin 9 (GND). An external signal to this
pin can reset both the alarm output signal and the internal buzzer. Normally this signal is high.
PIN 15: EXTERNAL ALARM COM: During normal functioning COM is connected with NC and not with NO. When
there is an alarm trigger, COM disconnects from NC and connects with NO.

4. Operation

a) Power on the Device
Before turning the power ON, make sure a HDD is installed and the tray has been locked. If no HDD is installed, the
DVR4MQA will function as a 4-channel multiplexer.
1. Connect the DVR4MQA to a mains outlet by means of the supplied AC power cord and adapter and press the
POWER button (p.5 #17). The red LED indicator next to it lights up: the DVR is in standby mode.
2. Press the POWER button, the POWER LED will turn to orange and all the other LEDs (p.5 #9) will turn red. The
device takes anywhere from 5 to 15 seconds to boot, all the while displaying the message "HDD detecting". When
the boot is complete and the HDD is detected, the LED will turn to green and the ALARM LED will be lit.
When no HDD is detected, "HDD not found" appears for 3 seconds and the device goes to 4CH multiplexer mode.
3. Set the system time before operating the DVR4MQA (see §5-b-11 on p.9).
NOTE: to switch from NTSC to PAL or vice versa, power down the device and unplug the AC power cord. For NTSC,
press POWER+FF before reconnecting the cord ; for PAL, press POWER+REW.
DVR4MQA
9-pin COM port
- 6 - VELLEMAN