© National Instruments
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PXIe-8840 User Manual
PXI Express Features
PXI Express Trigger Connectivity
The SMB connector on the PXIe-8840 front panel can connect to or from any PXI Express
backplane trigger line. A trigger allocation process is needed to prevent two resources from
connecting to the same trigger line, resulting in the trigger being double-driven and possibly
damaging the hardware. At the time of this manual’s publication, this software is not
yet available for Windows. Contact National Instruments for more information.
PXI Express Chassis Configuration
The PXI Express Platform Services software installed on your controller and available on the
National Instruments Driver DVD
or
PXI Platform Services CD
included with your kit
automatically identifies your PXI Express system components to generate a
pxiesys.ini
and
pxisys.ini
file. You can configure your entire PXI Express system through Measurement &
Automation Explorer (MAX), included with your controller. MAX creates the
pxiesys.ini
and
pxisys.ini
file, which define your PXI Express system parameters. MAX also provides
an interface to route and reserve triggers so dynamic routing, through drivers such as DAQmx,
avoids double-driving and potentially damaging trigger lines. For more information about
routing and reserving PXI Express triggers, refer to KnowledgeBase 3TJDOND8,
Using PXI
Timing and Triggering Functionality
, at
ni.com/support
.
The configuration steps for single or multiple-chassis systems are the same.
PXI Express System Configuration
1.
Launch Measurement & Automation Explorer (MAX).
2.
In the
Configuration
tree, expand
Devices and Interfaces
.
3.
In the
Devices and Interfaces
tree, expand
PXI System
. Your PXI Express chassis is
already identified and appears in the
PXI System
tree.
4.
For each unidentified PXI Express chassis in the
PXI System
tree, right-click on the chassis
and select the appropriate chassis model through the
Identify As
submenu. Further
expanding the
PXI System
branch shows all devices in the system that NI-VISA can
recognize.
The PXI Express specification allows for many combinations of PXI Express chassis and system
modules. To assist system integrators, PXI Express chassis and system module manufacturers
must document their products’ capabilities. PXI Express devices must provide a driver and/or
.ini
file for identification. For NI PXI Express chassis and controllers, these files are provided
as part of the NI PXI Platform Services software included with your controller. System
integrators, configuration utilities, and device drivers can use these
.ini
files.
The NI PXI Platform Services software uses the system module driver, chassis driver, and
chassis.ini
files to generate the PXI/PXI Express system description files (
pxisys.ini
