USER GUIDE AND SPECIFICATIONS
NI USB-9421
8-Channel, 24 V Logic, Sinking Digital Input Device
This user guide describes how to use the National Instruments USB-9421
and lists the device specifications. In this user guide, the NI USB-9421 with
screw terminal and the NI USB-9421 with D-SUB are referred to
inclusively as the NI USB-9421
.
Introduction
The NI USB-9421 data acquisition device provides a USB interface with
connections for eight digital input channels. The NI USB-9421 consists
of two components: an NI 9421 module and an NI USB-9162 carrier,
as shown in Figure 1.
Figure 1.
NI USB-9421 Components
NI 9421
NI USB-9162
NI USB-9421
Hi-SP
eed USB Carrie
r
NI US
B-9162
Hi-Speed USB
Carrier
NI U
SB-9162
