5
Pinout of NetGuardian 864A
4.2
Alarm and control relay connectors
The NetGuardian 864's discrete alarm inputs, control relay outputs, and first six analog alarm inputs are connected
through the two 50-pin connectors labeled "Discretes 1–24" and "Analogs 1–6/Discretes 25–32/Relays 1–8" on the
back panel. Analog alarm inputs 7 and 8 are connected through the four-pin connector labeled "Analogs 7–8."
4.2.1 Alarm and Control Relay Connector Pinout Table
Discretes 1–48
ALM
PIN
ALM
PIN
1
26
26
13
2
1
27
39
3
27
28
14
4
2
29
40
5
28
30
15
6
3
31
41
7
29
32
16
8
4
33
42
9
30
34
17
10
5
35
43
11
31
36
18
12
6
37
44
13
32
38
19
14
7
39
45
15
33
40
20
16
8
41
46
17
34
42
21
18
9
43
47
19
35
44
22
20
10
45
48
21
36
46
23
22
11
47
49
23
37
48
24
24
12
GND
25
25
38
GND/RTN*
50
Discretes 49-64, Relays 1-8, Analogs 1-6
ALM
PIN
Relays 1-8
49
26
RLY 1
9
34
50
1
RLY 2
10
35
51
27
RLY 3
11
36
52
2
RLY 4
12
37
53
28
RLY 5
13
38
54
3
RLY 6
14
39
55
29
RLY 7
15
40
56
4
RLY 8
16
41
57
30
FUSE
17
42
58
5
ADC
+
-
59
31
ADC 1
19
44
60
6
ADC 2
20
45
61
32
ADC 3
21
46
62
7
ADC 4**
22
47
63
33
ADC 5**
23
48
64
8
ADC 6**
24
49
GND
25
GND/RTN*
50
Analogs 7-8
ADC
+
-
7
B
A
8**
B
A
Table 7.B.
Alarm and relay connection pinouts for NetGuardian 864
RTN*
is the alarm return pin. Alarms on standard units are dry closure or ground closure. Most units will
have RTN internally tied to GND. However, special hardware assemblies may have RTN isolated from
GND.
