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External I/O Port (37pin DSUB)
Pin No. Definition Direction Pin No. Definition Direction
1 GND Power 20 Reserved Input
2 GND Power 21 Reset Alarm Input
3 GND Power 22 Day / Night output Output
4 GND Power 23 Day / Night switch Input
5 Reserved - 24 Set Alarm Input
6 Reserved - 25 Reserved -
7 Alarm NO Output 26 Alarm In 13 Input
8 Alarm COM Output 27 Alarm In 12 Input
9 Alarm NC Output 28 Alarm In 11 Input
10 GND Power 29 Alarm In 10 Input
11 GND Power 30 Alarm In 9 Input
12 GND Power 31 Alarm In 8 Input
13 GND Power 32 Alarm In 7 Input
14 GND Power 33 Alarm In 6 Input
15 GND Power 34 Alarm In 5 Input
16 Alarm In 16 Input 35 Alarm In 4 Input
17 Alarm In 15 Input 36 Alarm In 3 Input
18 Alarm In 14 Input 37 Alarm In 2 Input
19 Alarm In 1 Input
External I/O Board
There is an “External I/O board” included in the DVR-16/IP box. You can connect it to the
External I/O port; the pins are identified as the definitions listed on the board. Three pins are
listed but of no use: VCR Trigger, RS-232 RX and RS-232 TX.