© National Instruments Corp. 7 NI 9425 Operating Instructions and Specifications
Connecting the NI 9425

The NI 9425 has a 37-pin DSUB connector that provides

connections for 32 simultaneously-sampled digital input channels.

Figure 1. NI 9425 Pin Assignments

DI16
DI17
DI18
DI19
DI20
DI21
DI22
DI23
COM
COM
DI24
DI25
DI26
DI27
DI28
DI29
DI30
DI31
DI0
DI1
DI2
DI3
DI4
DI5
DI6
DI7
COM
COM
DI8
DI9
DI10
DI11
DI12
DI13
DI14
DI15
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37