User’s Manual
DVR-4TH/8TH/16TH Series
SPECO TECHNOLOGIES 07/10 161
Appendix F: Alarm I/O Pin Definition
The tables below list the pin definitions of alarm I/O located on the rear panel of the
DVR-4TH/ 8TH/ 16TH series unit.
DVR-4TH Alarm I/O
Pin Definition Pin Definition Pin Definition
1 RS485 D+ 8 Normal Close B 15 Reserved
2 RS485 D- 9 Common Node B 16 Reserved
3 Ground 10 Normal Open B 17 Reserved
4 Normal Close A 11 Alarm In 1 18 Reserved
5 Common Node A 12 Alarm In 2 19 Reserved
6 Normal Open A 13 Alarm In 3 20 Reserved
7 Ground 14 Alarm In 4
DVR-8TH Alarm I/O
Pin Definition Pin Definition Pin Definition
1 RS485 D+ 8 Normal Close B 15 Alarm In 5
2 RS485 D- 9 Common Node B 16 Alarm In 6
3 Ground 10 Normal Open B 17 Alarm In 7
4 Normal Close A 11 Alarm In 1 18 Alarm In 8
5 Common Node A 12 Alarm In 2 19 Reserved
6 Normal Open A 13 Alarm In 3 20 Reserved
7 Ground 14 Alarm In 4