Chapter 8
PFI
©
National Instruments Corporation
8-3
Exporting Timing Output Signals Using PFI Terminals
You can route any of the following timing signals to any PFI <6..9>
terminal.
•
AI Hold Complete Event
•
Counter
n
Source
•
Counter
n
Gate
•
Counter
n
Internal Output
•
Frequency Output
•
PXI_STAR
•
RTSI <0..7>
Note
Short pulses on the signal might not be observable by the user or another instrument.
Refer to the
Digital Output (Port 1)
section of the
NI 6238/6239 Specifications
for more
information.
Using PFI Terminals as Static Digital Inputs and Outputs
When a terminal is used as a static digital input or output, it is called P0.
x
or P1.
x
. On the I/O connector, each terminal is labeled PFI
x
/P0.
x
or
PFI
x
/P1.
x
.
Connecting PFI Input Signals
All PFI input connections are referenced to P0.GND. Figure 8-3 shows this
reference, and how to connect an external PFI 0 source and an external
PFI 2 source to two PFI terminals.