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Chapter 2 Function Reference — CTR_State
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National Instruments Corporation 2-113 NI-DAQ FRM for PC Compatibles
CTR_State
Format
status = CTR_State (deviceNumber, ctr, outState)
Purpose
Returns the OUT logic level of the specified counter.
Parameters
Input
Output
Parameter Discussion
ctr is the counter number.
Range: 1, 2, or 5 for an MIO device except the E Series devices.
1 through 10 for a PC-TIO-10.
outState returns the logic level of the counter OUT signal. outState is either 0 or 1.
0: Indicates that OUT is at a low-logic state.
1: Indicates that OUT is at a high-logic state.
Note
C Programmers—outState is a pass-by-reference parameter.
Using This Function
CTR_State reads the logic state of the OUT signal of the specified counter and returns the
state in outState. If the counter OUT driver is set to the high-impedance state, outState is
indeterminate and can be either 0 or 1.
Name Type Description
deviceNumber i16 assigned by configuration utility
ctr i16 counter number
Name Type Description
outState i16 returns the logic level of the counter OUT signal