©
National Instruments Corporation
8-1
Analog Output Series User Manual
8
Real-Time System Integration
Bus (RTSI)
NI-DAQ devices use the 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.
Refer to the KnowledgeBase document,
RTSI Connector Pinout
, for more
information. To access this document, go to
ni.com/info
and enter the
info code
rdrtcp
.
Note
The NI DAQCard-6715 does not use the RTSI bus.
RTSI Triggers
The seven RTSI trigger lines on the RTSI bus provide a flexible
interconnection scheme for devices sharing the RTSI bus. These
bidirectional lines can drive or receive any of the timing and triggering
signals shown below directly to or from the trigger bus.
The RTSI trigger lines on PXI devices connect to other devices through the
PXI bus on the PXI backplane. RTSI <0..5> connect to PXI Trigger <0..5>,
respectively. The RTSI Clock is connected to PXI Trigger 7. In PXI, RTSI 6
connects to the PXI star trigger line, allowing the device to receive triggers
from any star trigger controller plugged into Slot 2 of the chassis. AO Series
devices can accept timing signals from the PXI star trigger line, but they
cannot drive signals onto it. For more information on the star trigger, refer
to the
PXI Hardware Specification Revision 2.1
.
