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Appendix C Common Questions
PCI-6023E/6024E/6025E User Manual C-4
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National Instruments Corporation
are 24-bit counters (unlike the 16-bit counters on boards without the
DAQ-STC).
If you are using the NI-DAQ language interface or LabWindows/CVI, the
answer is no, the counter/timer applications that you wrote previously will
not work with the DAQ-STC. You must use the GPCTR functions; ICTR
and CTR functions will not work with the DAQ-STC. The GPCTR
functions have the same capabilities as the ICTR and CTR functions, plus
more, but you must rewrite the application with the GPCTR function calls.
I’m using one of the general-purpose counter/timers on my board, but
I do not see the counter/timer output on the I/O connector. What am I
doing wrong?
If you are using the NI-DAQ language interface or LabWindows/CVI, you
must configure the output line to output the signal to the I/O connector. Use
the
Select_Signal call in NI-DAQ to configure the output line. By
default, all timing I/O lines except EXTSTROBE* are tri-stated.
What are the PFIs and how do I configure these lines?
PFIs are Programmable Function Inputs. These lines serve as connections
to virtually all internal timing signals.
If you are using the NI-DAQ language interface or LabWindows/CVI, use
the
Select_Signal function to route internal signals to the I/O connector,
route external signals to internal timing sources, or tie internal timing
signals together.
If you are using NI-DAQ with LabVIEW and you want to connect external
signal sources to the PFI lines, you can use AI Clock Config, AI Trigger
Config, AO Clock Config, AO Trigger and Gate Config, CTR Mode
Config, and CTR Pulse Config advanced level VIs to indicate which
function the connected signal will serve. Use the Route Signal VI to enable
the PFI lines to output internal signals.
Caution If you enable a PFI line for output, do not connect any external signal source to
it; if you do, you can damage the board, the computer, and the connected
equipment.
What are the power-on states of the PFI and DIO lines on the I/O
connector?
At system power-on and reset, both the PFI and DIO lines are set to high
impedance by the hardware. This means that the board circuitry is not
actively driving the output either high or low. However, these lines
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PCI.book Page 4 Wednesday, September 16, 1998 9:09 AM