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Chapter 3
I/O Information
©
National Instruments
3-9
Universal Serial Bus
Figure 3-6 shows the location and pinouts for the Universal Serial Bus
(USB) connector on the NI PXI-8820. Each controller has six USB ports
on the front panel. Table 3-7 lists and describes the USB connector signals.
Figure 3-6.
USB Connector Location and Pinout
Caution
To ensure the specified EMC performance, install a snap-on ferrite (National
Instruments part number 711849-01) in accordance with the product installation
instructions.
Install a noise-suppression ferrite (included in your shipping kit) around all attached
external USB cables to ensure that your device meets all EMC standards applicable to your
country. Install the ferrite so that each USB cable loops through the ferrite as shown in
Figure 3-7. The ferrite should be installed so that it is approximately 50 to 75 mm (2 to
Table 3-7.
USB Connector Signals
Pin
Signal Name
Signal Description
1
VCC
Cable Power (+5 V)
2
-Data
USB Data -
3
+Data
USB Data +
4
GND
Ground
USB
4
1
NI PXI-8820
Embedded Controller
USER2
USER2
USER1
USER1
ACT/
ACT/
LINK
LINK
10/
0/100
00
/1000
/1000
PWR OK /
K /
FAULT
FAULT
DRIVE
RIVE
TRIG
RIG
RESET
RESET