Real-Time System Integration Bus; Rtsi Triggers - National Instruments NI 6602 User Manual

Chapter 3 Signal Connections

Real-Time System Integration Bus

RTSI Triggers

NI 660x User Manual
TIO devices use the National Instruments Real-Time System Integration
(RTSI) bus to easily synchronize several measurement functions to a
common trigger or timing event. 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 devices
in the computer. In a PXI 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. For a RTSI connector pinout, go to
and enter
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TIO devices require a frequency timebase for its operation. This frequency
timebase must come from the onboard crystal oscillator and is required
even if the device is receiving a MasterTimebase signal from the RTSI
trigger bus. Any TIO device can drive its 20MHzTimebase signal onto the
RTSI Trigger 7 pin. Although some TIO devices have a 80MHzTimebase
(such as the NI 6602), the RTSI bus cannot carry the 80MHzTimebase
signal for bandwidth reasons. By default, TIO devices do not drive the
RTSI Trigger 7 bus clock line.
Figure 3-8 shows the RTSI signal connection scheme for PCI TIO devices.
Trigger <0..6>
RTSI Trigger 7
Figure 3-8. RTSI Signal Connection Scheme for PCI
.
rtsipin
3-16
CtrnSource
CtrnGate
CtrnAux
CtrnInternalOutput
20 MHz Timebase
Master Timebase
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