Chapter 8
Real-Time System Integration Bus (RTSI)
©
National Instruments Corporation
8-3
Analog Output Series User Manual
Figure 8-2 shows the PXI RTSI bus signal connection.
Figure 8-2.
PXI RTSI Bus Signal Connection
Refer to the
section of Chapter 7,
,
for a description of the signals shown in Figure 8-1 and Figure 8-2.
Note
In NI-DAQmx, some additional timing signals not shown in the figures can be
routed to RTSI indirectly. Click the
Device Routes
tab in
Measurement & Automation
Explorer
for more information.
Device and RTSI Clocks
Many AO Series device functions require a frequency timebase to
generate the necessary timing signals for controlling DAC updates or
general-purpose signals at the I/O connector. This timebase is also called
the Master Timebase or Onboard Clock. For more information, refer to the
The AO Series device can use either its internal 20MHzTimebase signal or
a timebase received over the RTSI bus. The timebase can only be routed to
or received from RTSI 7, or the RTSI clock. The device uses this clock
source, whether local or from the RTSI bus, as the primary frequency
PXI B
us
Connector
S
witch
RT
S
I
S
witch
PXI Trigger 7
PXI Trigger
<0..5>
DAQ-
S
TC
Ctr0
S
o
u
rce
Ctr0G
a
te
Ctr0Intern
a
lO
u
tp
u
t
Ctr0O
u
t
Ctr1
S
o
u
rce
Ctr1G
a
te
20MHzTime
bas
e
M
as
terTime
bas
e
PXI
S
t
a
r 6
a
o/
S
t
a
rtTrigger
a
o/P
aus
eTrigger
a
o/
Sa
mpleClockTime
bas
e
6
a
o/
Sa
mpleClock
