Chapter 2 Hardware Overview ofthe NI PXI-7831R
NI PXI-7831R User Manual 2-20 ni.com
other peripheral slots and results in very precise trigger timing signals.
Forexample, an NI PXI-7831R in slot 2 can send out an independent
trigger signal to each device plugged into slots <3..15> using the
PXI/LBLSTAR<0..12>. Each device receives its trigger signal on its own
dedicated star trigger line.
Caution Do not configure the NIPXI-7831R and another device to drive the same physical
star trigger line simultaneously. Such signal driving can damage the NIPXI-7831R and the
other device. NI is not liable for any damage resulting from such signal driving.
Refer to the PXI Hardware Specification Revision 2.1 and PXI Software
Specification Revision 2.1 at www.pxisa.org for more information about
PXI triggers.
Switch Settings
Refer to Figure 2-2 for the location of switch SW1. For normal operation,
switch1 is in the OFF position. To prevent a VI stored in flash memory
from loading to the FPGA upon power up, you can move switch 1 to the
ON position, as shown in Figure 2-11.
Figure 2-11. Switch Settings on Switch SW1
To move switch1 to the ON position, complete the following steps:
1. Power off and unplug the PXI/CompactPCI chassis.
2. Remove the NIPXI-7831R.
3. Move switch1 to the ON position, as show n in Figure 2-11.
4. Refer to the Installing the Hardware section of the Where to Start with
the NIPXI-783 1R document for installation instructions for
reinserting the NI PXI-7831R into the PXI/CompactPCI chassis.
5. Plug in and power on the PXI/CompactPCI chassis.
After completing this procedure, a VI stored in flash memory does not load
to the FPGA on power up. You can use software to reconfigure the
NIPXI-7831R if necessary. To return to the default mode of loading from
123
ON
a. Normal Operation (Default)
123
ON
b. Prevent VI From Loading