Discrete Alarms - DPS Telecom NetGuardian 216 DCP User Manual

10
Discretes 1–16
B* A*
1 26
ALM 1
2 27
ALM 2
3 28
ALM 3
4 29
ALM 4
5 30
ALM 5
6 31
ALM 6
7 32
ALM 7
8 33
ALM 8
9 34
ALM 9
ALM
10 35
10
ALM
11 36
11
ALM
12 37
12
ALM
13 38
13
* The polarity of alarm point A is negative and alarm point B is positive.
** NO=Normally Open, NC=Normally Connected, CO=Common
*** A contact closure will occur when the fuse is blown.

4.7.1 Discrete Alarms

Dry Contact
NetGuardian case
- Batt.
Fig. 4.11. Discrete alarm points can connect as a dry contact or a contact to ground
The NetGuardian 216 supports up to 16 discrete alarm inputs. Discrete alarms are typically used to monitor door
alarms, power outages, equipment failures, and other on/off conditions.
Discrete alarm points connected to the NetGuardian are single-lead signals referenced to ground. The B side of
each alarm point is internally wired to ground, so either a single wire bringing a contact to ground or a dry closure
Table 4.A. Alarm point polarity descriptions
B* A*
ALM
14 39
Relay 1
14
ALM
15 40
Relay 2
15
ALM
16 41
16
25 50
GND
AL 1B
AL 1A
Relays**
NC NO CO
42 17 43
44 19 18
Fuse
20 45
Alarm***
Contact to Ground
NetGuardian case
- Batt.
Note: Make sure that grounds have a common reference
usually accomplished by tying grounds together.
Analogs 1–2
+ – +
B 23 48
Analog
A
1
Analog B 24 49
A
2
AL 1B
AL 1A
–