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Chapter 2 Hardware Overview of the NI 783xR
© National Instruments Corporation 2-23 NI 783xR User Manual
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 783xR from the PXI/CompactPCI chassis or PCI
computer.
3. Move SW1 to the ON position, as shown in Figure 2-14b.
4. Reinsert the NI 783xR into the PXI/CompactPCI chassis or PCI
computer. Refer to the Installing the Hardware section of the Getting
Started with the NI 783xR 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 783xR,
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 783xR with the
software to autoload an FPGA VI.
Note When the NI 783xR 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 783xR for the desired power-up behavior.
Afterward, return SW1 to the OFF position.
Power Connections
Two pins on each I/O connector supply 5 V from the computer power
supply using a self-resetting fuse. The fuse resets automatically within a
few seconds after the overcurrent condition is removed. The +5V pins are
referenced to DGND and can power external digital circuitry. The
NI 783xR has the following power rating:
+4.50 to +5.25 VDC (250 mA max per +5V pin)
Caution Do not connect the +5V power pins directly to analog or digital ground or to any
other voltage source on the NI 783xR or any other device under any circumstance. Doing
so can damage the NI 783xR and the computer. NI is not liable for damage resulting from
such a connection.