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National Instruments
C-1
VXI-MXI-Express Series User Manual
Using the Trigger Ports on the
NI VXI-8360T
The NI VXI-8360T allows you to extend the 8 VXI backplane triggers and
CLK10 through convenient front panel connectors. Each trigger and the
CLK are independently configurable as either inputs to the frame or outputs
from the frame. The wired VXI backplane trigger and CLK10 bus is
connected in a daisy chain topology and can support up to 6 devices with a
total of 19 m of cables.
Cautions
The wired VXI backplane trigger and CLK10 bus uses MXI-Express x4 cables
and connectors, however these are not MXI-Express x4 ports. Do
not
connect the trigger
ports to a MXI-Express x4 or PCI Express x4 device.
The trigger bus may be able to support more devices and/or greater cable lengths, but these
configurations have not been validated by National Instruments and are not currently
supported.
Connecting the Trigger Port Cables
When connecting the cables between two devices on the wired VXI
backplane trigger and CLK10 bus, always ensure you connect TRIG/CLK
PORT A of one device to TRIG/CLK PORT B of the second device, or
TRIG/CLK PORT B of one device to TRIG/CLK PORT A of the second
device, as shown in Figure C-1.
If the cables are not connected correctly, the Cable Status LED will blink
red, and the trigger drivers in that system will be disabled.
Note
Trigger bus cables may be removed and inserted while power is on.
End of bus termination is also required for proper operation. The
VXI-8360T automatically detects its position on the wired VXI backplane
trigger and CLK10 bus and it will enable its termination if it detects it is at
the end of the bus
