Справочник Пользователя для National Instruments 321645c-01
Chapter 2
Function Reference — ICTR_Setup
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National Instruments Corporation
2-251
NI-DAQ FRM for PC Compatibles
ICTR_Setup
Format
status = ICTR_Setup (deviceNumber, ctr, mode, count, binBcd)
Purpose
Configures the given counter to operate in the specified mode.
Parameters
Input
Parameter Discussion
ctr is the counter number.
Range:
0 through 2.
mode is the mode in which the counter is to operate.
0:
Toggle output from low to high on terminal count.
1:
Programmable one-shot.
2:
Rate generator.
3:
Square wave rate generator.
4:
Software-triggered strobe.
5:
Hardware-triggered strobe.
In mode 0, the output goes low after the mode set operation, and the counter begins to count
down while the gate input is high. The output goes high when NI-DAQ reaches the terminal
count (that is, the counter has decremented to zero) and stays high until you set the selected
counter to a different mode. Figure 2-32 shows the mode 0 timing diagram.
down while the gate input is high. The output goes high when NI-DAQ reaches the terminal
count (that is, the counter has decremented to zero) and stays high until you set the selected
counter to a different mode. Figure 2-32 shows the mode 0 timing diagram.
Name
Type
Description
deviceNumber
i16
assigned by configuration utility
ctr
i16
counter number
mode
i16
mode in which the counter is to operate
count
u16
period from one output pulse to the next
binBcd
i16
16-bit binary or 4-decade binary-coded decimal