National Instruments NI-VXI - Manual (Page 91)

Chapter 3 Software Overview
© National Instruments Corporation 3-53 NI-VXI User Manual
general, however, National Instruments hardware has two current
configurations that provide triggering functionality:
• Trigger control used on a VXI-MXI-1 frame extender when used as
an extending controller (under direct control of a root-level MXI-1
controller interface, such as an AT-MXI-1). These configurations
do not have the National Instruments Trigger Interface Chip (TIC)
on them.
Note: VXI-MXI-1 and VXI-MXI-2 controllers that are configured for extender
only (that is, not extending controllers), as well as external MXI-1
controllers, do not have trigger functionality. See the section, Multiple
Mainframe Support, in Chapter 2, Introduction to the NI-VXI Functions,
for more information.
• An embedded controller, external MXI-2 controllers, or
VXI-MXI-2 remote controllers. These configurations do have the
National Instruments Trigger Interface Chip (TIC) on them.
External Controller/VXI-MXI-1 Trigger
Capabilities
All National Instruments external controllers (such as the AT-MXI-1)
that are connected to VXI-MXI-1 extending controllers have the same
basic trigger capabilities:
• Source a single TTL or ECL (0 and 1 only) trigger using any
protocol on any one of the backplane TTL trigger lines
• Accept a single backplane TTL or ECL (0 and 1 only) trigger using
any protocol (as long as it does not source SEMI-SYNC and
ASYNC protocols at the same time)
• Map a front panel In connector to a TTL or ECL (0 or 1 only)
trigger line (sourcing will be disabled)
• Source a TTL or ECL (0 or 1 only) trigger out the front panel
• Map a TTL or ECL (0 or 1 only) trigger line from the backplane
out the front panel Out connector (accepting disabled) (Some
platforms do not have this capability.)
The following capabilities are not supported:
• Multiple-line support
• Crosspoint switching
• Signal conditioning
• External connections other than the front panel In/Out