Chapter2 PXI-1006Features
PXI-1006User Manual 2-6 ni.com

TriggerBus

ThePXI-1006 has three PXI segments. Vertical bars represent the segment
divisionson the front of the chassis. (See Figure 2-1for the segment divider
locations.) The PXI trigger busis divided into three separate trigger buses
at these locations. You can use the trigger lines in a variety of ways. For
example, you can use triggers to synchronize the operation of several
different PXI peripheral modules. In other applications, one module can
controlcarefully timed s equencesof operations performed on other
modulesin the system. Modulescan pass triggers to one another, allowing
precisely timed responses to asynchronous external events the system is
monitoring or controlling.

System Reference Clock

ThePXI-1006 supplies the PXI 10 MHz system clock signal (PXI_CLK10)
independently to every peripheral slot. An independent buffer (having a
sourcei mpedance matched to the backplane and a skew of less than 1 ns
betweenslots) drives the clock signal to each peripheral slot. You can use
this common reference clock signal to synchronize multiple modules in a
measurement or control system. You can drive PXI_CLK10 from an
externalsource through the PXI_CLK10_IN pin on the P2 connector of the
startr igger slot. (See Table B-1, P1 (J1) Connector Pinout for the System
Controller Slot.) Sourcing an external clock on this pin automatically
disablesthe b ackplane’s 10 MHz source.
Rack Mounting
Rack-mount applications require the optional rack-mount kit available
from National Instruments. Refer to the instructions supplied with the
rack-mount kit to install your PXI-1006 in a standard 19 in. instrument
rack.