multifunction-rio-user-manual.pdf - 第43页
Chapter 2 Hardware Overview of the NI 78x x © National Instruments Corporation 2-25 Multifunction Reconfigurabl e I/O User Manual Figure 2-15. Switch Location on the PCI-783 x Figure 2-16. Switch Location on the PXI-783 …
Chapter 2 Hardware Overview of the NI 78xx
Multifunction Reconfigurable I/O User Manual 2-24 ni.com
Figure 2-13. Switch Location on the PCI-781x
Figure 2-14. Switch Location on the PXI-781x
SW1, SW2, SW3
N
I PX
I-
7811R
Reconfigurab
le I/O
CONNECTOR 2 (DIO)CONNECTOR 3 (DIO)
SW1, SW2, SW3
Chapter 2 Hardware Overview of the NI 78xx
© National Instruments Corporation 2-25 Multifunction Reconfigurable I/O User Manual
Figure 2-15. Switch Location on the PCI-783x
Figure 2-16. Switch Location on the PXI-783x
SW1, SW2, SW3
SW1, SW2, SW3
CONNECTOR 2 (DIO)
NI PXI-7831R
Reconfigurable I/O
Chapter 2 Hardware Overview of the NI 78xx
Multifunction Reconfigurable I/O User Manual 2-26 ni.com
Figure 2-17. Switch Settings
Complete the following steps to prevent a VI stored in Flash memory from
loading to the FPGA:
1. Power off and unplug the PXI/CompactPCI chassis or PCI computer.
2. Remove the NI 781x/783x from the PXI/CompactPCI chassis or PCI
computer.
3. Move SW1 to the ON position, as shown in Figure 2-17b.
4. Reinsert the NI 781x/783x into the PXI/CompactPCI chassis or PCI
computer. Refer to the Installing the Hardware section of the Getting
Started with R Series Multifunction RIO document for installation
instructions.
5. Plug in and power on the PXI/CompactPCI chassis or PCI computer.
After completing this procedure, a VI stored in Flash memory does not load
to the FPGA at power-on. You can use software to configure the NI 78xx,
if necessary. To return to the defaults of loading from Flash memory, repeat
the previous procedure but return SW1 to the OFF position in step 3. You
can use this switch to enable/disable the ability to load from Flash memory.
In addition to this switch, you must configure the NI 78xx with the software
to autoload an FPGA VI.
Note When the NI 781x/783x is powered on with SW1 in the ON position, the analog
circuitry does not return properly calibrated data. Move the switch to the ON position only
while you are using software to reconfigure the NI 781x/783x for the desired power-up
behavior. Afterward, return SW1 to the OFF position.
+5 V Power Source
The +5 V terminals on the I/O connector supply +5 V referenced to DGND.
Use these terminals to power external circuitry.
Newer revision NI 781x/783x devices have a traditional fuse to protect the
supply from overcurrent conditions. This fuse is not customer-replaceable;
if the fuse permanently opens, return the device to NI for repair.
123
ON
123
ON
a. Normal Operation (Default) b. Prevent VI From Loading