Skip to main content
Skip table of contents

2.5 - CNT [U12 Datasheet]

The input connection to the 32-bit counter is made at screw-terminal CNT. Internally there is a 1.5 kΩ series resistor (provides overvoltage protection) and then a 1 MΩ resistor to ground (weakly holds line low when floating).

The counter is incremented when it detects a falling edge followed by a rising edge. This means that if you reset the counter while your signal is low, you will not get the first count until it goes high-low-high. In situations where this first count is important, you should simply substract the initial count from the final count, rather than doing a reset.

The counter (CNT) is disabled when the watchdog is enabled.

Software

The functions ECount (easy function), AOUpdate, and Counter are used to reset or read the counter. If a reset is specified, the counter is read first. All of these functions take up to 20 ms to execute, providing a maximum update rate of about 50 Hz.

Counter readings can also be returned in stream mode (AIStreamRead) at up to 300 Hz.

JavaScript errors detected

Please note, these errors can depend on your browser setup.

If this problem persists, please contact our support.