Velleman DVR1A Mode D'emploi page 6

25-pin COM port 9-pin COM port
PIN 1: RS232-TX: RS-232 + PIN 2: RS232-RX: RS-232: 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: VIDEO LOSS: When video loss occurs, a signal is sent to trigger another device. During normal functioning
this signal is high ; when video loss occurs it becomes low.
PIN 4: SWITCH OUT: Connect this pin to the VCR trigger recording terminal of a multiplexer, in order to synchronise
recording signals. The default mode of this signal is low.
PIN 5: ERROR OUT: When a HDD error occurs, this pin will send a signal. During normal functioning this signal is
high ; when a HDD error occurs it becomes low.
PIN 6: REC START: This pin can accept the trigger signal from an external device to start recording. Normally, this
signal is high ; when it becomes low the DVR1A starts recording ; when it becomes high again the recording stops.
PIN 7: EXTERNAL ALARM NC + PIN 8: EXTERNAL 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: The device can be controlled remotely by an external device or control
system, such as a control keyboard, using RS485 serial communications signals.
PIN 12: DISK FULL: If you've connected several DVR1A's, and the hard disk of the operating one is full, it will send
a signal to the next device, which will start recording. During normal functioning this signal is high ; when the HDD is
full, it becomes low.
PIN 13: ALARM RESET: By connecting ALARM RESET (pin 13) to GND (pin 9), you can disable the ALARM. An
external signal to ALARM RESET (pin 13) can be used to reset both ALARM OUTPUT signal and DVR1A's internal
buzzer. During normal functioning this signal is high ; when the alarm reset is triggered, it becomes low and will stop
all alarm functionalities.
PIN 14: ALARM INPUT: By connecting ALARM INPUT (pin 14) to GND (pin 9), the DVR1A will start recording and
the buzzer will be on. During normal functioning this signal is high ; when there is an incoming alarm signal, it
becomes low, the device will start recording and the buzzer will be on.
PIN 15: 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.
DVR1A
VELLEMAN
- 6 -