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National Instruments Corporation
5-1
DAQ-STC Technical Reference Manual
5
Programmable Function Inputs
5.1 Overview
This chapter explains the PFI module on the DAQ-STC. The 10 PFI lines provide a user
configurable interface to the board I/O connector. External timing, trigger, and control signals
can be input through the PFI and routed internally within the DAQ-STC. Also, the PFI lines
can output internally generated timing, trigger, and control signals on dedicated pins when the
pins are not used as inputs.
5.2 Features
The PFI module has the following features:
•
Ten individually programmable bidirectional lines
•
9 mA sink current, 5 mA source current
•
Analog input timing module interface
–
Inputs: START1, START2, START, STOP, SI source, CONVERT source,
and external gate
–
Outputs: START1, START2, START, CONVERT, and SCAN_IN_PROG
•
Analog output timing module interface
–
Inputs: START1, START, UPDATE, UI source, UI2 source, and secondary external
gate
–
Outputs: START1 and UPDATE
•
General-purpose counter/timer interface
–
Inputs: G0 source, G0 gate, G1 source, and G1 gate
–
Outputs: G0 source, G0 gate, G1 source, and G1 gate
