© National Instruments Corporation B-1 NI VXIpc-882 User Manual
B

Using The Trigger Ports On The

NI VXIpc-882

The NI VXIpc-882 allows you to extend the 8 TTL backplane triggers and
CLK10 between chassis through convenient front panel connectors. Each
trigger and the CLK are independently configurable as either inputs or
outputs of the frame. The trigger bus is connected in a daisy chain topology
and can support up to six (6) devices with a total of 19 m of cables.
Cautions The trigger bus uses the MXI-Express x4 cables, 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 trigger bus,
always ensure you connect TRIG/CLK PORT A of one device to
TRIG/CLK PORT B of the second device, or TRIG/CLKPORT B
of one device to TRIG/CLK PORT A of the second device, as shown
in Figure B-1. The front panel LED will blink red if the cables are not
connected correctly. The LED will be lit steady state green if they are
connected properly.
Note Trigger bus cables may be removed and inserted while power is on.