DACS App Note

DACS Digital Input Module/Card Interface Notes (#7)

Digital Input Module/Card Configurations

There are two available configurations of Digital Input Module/Card indicated by the Module/Card part number:

Configuration Module / Card P/N Sense Type Wetting Voltage
I D402-A/D402-A-1 Contact +5V External
II D402-A/D402-A-1 Contact +5V External
III D402-A-2 Contact +5V External
III D402-A-2 Contact +5V External

Consult the system configuration drawing provided with your DACS to determine the part number of your Digital Input Module/Card.

Interface Requirements

Type I

Type I configurations require an external pull up resistor as shown in the first diagram below. No external input voltage is applied to pins 17, 18, 36, and 37.

There are 16 DI channels available. Interface is via a standard female 37 way "D" connector. The diagram below shows general hook up for a single DI channel. Pin out information is included at the end of this application note. See also your Digital Input drawing included with your DACS.


Type II

The most common configuration is type II. There are 16 DI channels available. Interface is via a standard female 37 way "D" connector. The diagrams below show general hook up for a single DI channel. The external input voltage is applied to pins 17, 18, 36, and 37. Each of these external voltage pins supplies wetting voltage to one nibble (4 DI channels). Pin out information is included at the end of this application note. See also your Digital Input drawing included with your DACS.

The diagrams below show typical connections depending on whether wetting voltage supply is located near the DACS or near the switch(es) monitored.



Interface to the module or card is via a female 37way "D" connector. Below is the pinout description.

Pin Signal Pin Signal
1 HIGH IN 0 20 LOW IN 0
2 HIGH IN 1 21 LOW IN 1
3 HIGH IN 2 22 LOW IN 2
4 HIGH IN 3 23 LOW IN 3
5 HIGH IN 4 24 LOW IN 4
6 HIGH IN 5 25 LOW IN 5
7 HIGH IN 6 26 LOW IN 6
8 HIGH IN 7 27 LOW IN 7
9 HIGH IN 8 28 LOW IN 8
10 HIGH IN 9 29 LOW IN 9
11 HIGH IN 10 30 LOW IN 10
12 HIGH IN 11 31 LOW IN 11
13 HIGH IN 12 32 LOW IN 12
14 HIGH IN 13 33 LOW IN 13
15 HIGH IN 14 34 LOW IN 14
15 HIGH IN 14 34 LOW IN 14
16 HIGH IN 15 35 LOW IN 15
17 VEXT 1 36 VEXT 2
18 VEXT 3 37 VEXT 4
19 REF_GND