
Appendix C
Common Questions
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National Instruments Corporation
C-5
Do the counter/timer applications that I wrote previously work with
the DAQ-STC?
If you are using NI-DAQ with LabVIEW, some applications that were built
using the CTR VIs still run. However, there are many differences between
the counters of the NI PCI-6110/6111 and those of other devices: the
counter numbers are different, timebase selections are different, and the
DAQ-STC counters are 24-bit counters (unlike the 16-bit counters on
devices without the DAQ-STC).
If you are using NI-DAQ or Measurement Studio, the counter/timer
applications that you wrote previously do not work with the DAQ-STC.
You must use the GPCTR functions because ICTR and CTR functions do
not work with the DAQ-STC. The GPCTR functions have the same
capabilities as the ICTR and CTR functions, plus more, but you must first
rewrite the application using GPCTR function calls.
I’m using one of the general-purpose counter/timers on the
NI PCI-6110/6111, but I do not see the counter/timer output on
the I/O connector. What am I doing wrong?
If you are using NI-DAQ 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 high-impedance.
What are the PFIs and how do I configure these lines?
PFIs are Programmable Function Inputs. These lines serve as connections
to almost all internal timing signals.
If you are using NI-DAQ 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, and Counter Set
Attribute advanced-level VIs to indicate which function the connected
signal serves. Use the Route Signal VI to enable the PFI lines to output
internal signals.