Chapter 1
Introduction
©
National Instruments Corporation
1-9
SCXI Subsystem Backplane Overview
You can use the SCXI subsystem in the following ways:
•
Install several SCXI modules and a PXI DAQ device in Slot 8 of the
PXI backplane to control and/or acquire data from all the SCXI
modules.
•
Install several SCXI modules and cable one of them to a DAQ device
that controls and/or acquires data from all of the SCXI modules.
•
Install several SCXI modules and an SCXI-1200 module that operates
similarly to a DAQ device, except that it communicates with the host
computer through a parallel port instead of the computer plug-in bus.
•
Install SCXI modules that are each dedicated to conditioning signals
for only a single DAQ device (for example, in parallel mode), or that
operate independently and only use the SCXI subsystem as a power
source and/or container. You can use the chassis this way in addition to
or instead of one of the first three methods.
PXI Subsystem Backplane Overview
The following sections describe the PXI subsystem backplane.
Interoperability with CompactPCI
The PXI backplane is interoperable with PXI-compatible products and
standard CompactPCI products. This is an important feature, because many
PXI-compatible systems may require components that do not implement
PXI-specific features.
For example, you may want to use a standard CompactPCI network
interface card in a PXI chassis. The signals on the PXI-1050 backplane
P1 connector meet the requirements of the CompactPCI specification for
both the peripheral and system modules. The PXI-specific signals are
located on the P2 connector and are found only on the signals that are
reserved or not used in the CompactPCI 64-bit specification. Therefore,
all modules that meet the CompactPCI 64-bit specification requirements
will function in the PXI-1050.
