Chapter 9
Digital Routing and Clock Generation
9-4
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Real-Time System Integration (RTSI)
Real-Time System Integration (RTSI) is a set of bused signals among
devices that allows you to do the following:
•
Use a common clock (or timebase) to drive the timing engine on
multiple devices
•
Share trigger signals between devices
Many National Instruments DAQ, motion, vision, and CAN devices
support RTSI.
In a PCI system, the RTSI bus consists of the RTSI bus interface and a
ribbon cable. The bus can route timing and trigger signals between several
functions on as many as five DAQ, vision, motion, or CAN devices in the
computer.
In a PXI Express system, the RTSI bus consists of the RTSI bus interface
and the PXI trigger signals on the PXI backplane. This bus can route timing
and trigger signals between several functions on as many as seven DAQ
devices in the system.
RTSI Connector Pinout
(NI 6154 Only)
Figure 9-2 shows the RTSI connector pinout and Table 9-1
describes the RTSI signals.
Table 9-1.
RTSI Signals
Terminal
RTSI Bus Signal
1–18
Not Connected. Do not connect
signals to these terminals.
19, 21, 23, 25, 27, 29, 31, 33
D GND
20
RTSI 0
22
RTSI 1
24
RTSI 2
26
RTSI 3
28
RTSI 4
30
RTSI 5
