National Instruments 8-Channel, 24 V Logic, Sinking Digital Input Device, NI USB-9421 - page 11

© National Instruments Corporation 11 NI USB-9421 User Guide and Specifications
Each channel of the NI USB-9421 has a terminal or pin, DI, to which you
can connect voltage or current signals. The NI USB-9421 also has a
common terminal or pin, COM, that is internally connected to the isolated
reference of the module. Each digital input channel on the NI USB-9421
has an LED that indicates the state of that channel. Refer to Table3 for the
terminal assignments of the NI USB-9421 with screw terminal. Refer to
Figure 7 for the pin assignments of the NI USB-9421 with D-SUB.
Table 3. Terminal Assignments
Module Terminal Signal
0DI0
1DI1
2DI2
3DI3
4DI4
5DI5
6DI6
7DI7
8No connection
9Common (COM)
0
1
2
3
4
5
6
7
8
9
03
47