Chapter 2
Hardware Overview of the NI PXI-7831R
2-20
ni.com
other peripheral slots and results in very precise trigger timing signals.
For example, 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 NI PXI-7831R and another device to drive the same physical
star trigger line simultaneously. Such signal driving can damage the NI PXI-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,
switch 1 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 switch 1 to the ON position, complete the following steps:
1.
Power off and unplug the PXI/CompactPCI chassis.
2.
Remove the NI PXI-7831R.
3.
Move switch 1 to the ON position, as shown in Figure 2-11.
4.
Refer to the
Installing the Hardware
section of the
Where to Start with
the NI PXI-7831R
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
NI PXI-7831R if necessary. To return to the default mode of loading from
1 2 3
ON
a. Normal Operation (Default)
1 2 3
ON
b. Prevent VI From Loading
