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Digital I/O Lines
NetScan has eight digital input lines and thirty-two digital output lines available on a rear panel DB-50 connector.
These lines can be output and/or input using NetScan commands.
Note:
The first 16 output lines are available for use with relays via the high current CSN/Relay card option. If
used, the relay card must be installed in slot 1 (bottom slot) of the NetScan main unit. The CSN/Relay card
is discussed at the end of this chapter.
Logic Levels
Each digital output line will drive five (5) standard TTL loads. All digital input lines are one-eighth (0.125) TTL
loads. All inputs are protected against damage from high static voltage. Normal precautions should be taken to limit
the input voltages to the range of 0.0 to 5.3 volts. All digital I/O lines are referenced to digital ground pins (see
following table, DB50 Pinout).
Do not exceed the 0.0 to 5.3 volt levels described above. Exceeding these levels may
damaged the unit in a way not covered by the warranty.
Digital I/O Port Pinout
The following figure and table identify pin locations for outputs, inputs, and grounds associated with the DB50
connector. Outputs 1 through 32 are typically used for alarms 1 through 32, respectively. As mentioned above,
outputs 1 through 16 can be used with a relay card option.
7-10
DB50 Pin Descriptions
Output
Pin
Output
Signal
No.
Signal
1
1
17
2
34
18
3
18
19
4
2
20
5
35
21
6
19
22
7
3
23
8
36
24
9
20
25
10
4
26
11
37
27
12
21
28
13
5
29
14
38
30
15
22
31
16
6
32
Pin
Input
Pin No.
No.
Signal
39
1
15
23
2
48
7
3
32
40
4
16
24
5
49
8
6
33
41
7
17
25
8
50
9
42
26
Ground Pins
10
12, 13, 14,
43
28, 29, 30, 31,
27
45, 46, 47
11
44
NetScan User's Manual
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