What is the Auxiliary (AUX) Input on a Counter Used For? Hardware: Counter/Timers (TIO)
Problem: I have a Multifunction DAQ device that has a counter on it. When I look at the pinout, I see a source (SRC), a gate (GATE), and an auxiliary (AUX) signal input. What is the auxiliary (AUX) signal used for? Solution: NI-DAQ devices based on the TIO, STC II, and STC III chipsets have counters that include an auxiliary input terminal. (Note that this excludes STC- and A9513-based devices. NI E-series devices are thus excluded.) This terminal is referenced in literature as CtrnAux, where n is the numeric identification of its counter. Most devices have two counters whose auxiliary terminals are named Ctr0Aux and Ctr1Aux. The auxiliary signal can perform many different operations, depending on the specific application:
* In buffered edge counting, the AUX input can be used to control the direction while the GATE input can be used to control the buffering. The pulse width must be at least 5 ns wide to use the auxiliary signal.
For more information about NI-DAQ device counters, see the NI-DAQmx Help, which is installed with the NI-DAQ driver. It can be found in the Windows Start Menu under Programs » National Instruments » NI-DAQ. Inside the file, browse to NI-DAQmx Key Concepts » Counters. Related Links: Attachments:  - auxiliary.jpg
Report Date: 01/23/2007 Last Updated: 06/01/2007 Document ID: 45MDDT4G |
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