The Counter n HW Arm signal enables a counter to begin an input or output function.

To begin any counter input or output function, you must first enable, or arm, the counter. In some applications, such as a buffered edge count, the counter begins counting when it is armed. In other applications, such as single pulse-width measurement, the counter begins waiting for the Gate signal when it is armed. Counter output operations can use the arm signal in addition to a start trigger.

Software can arm a counter or configure counters to be armed on a hardware signal. Software calls this hardware signal the Arm Start Trigger. Internally, software routes the Arm Start Trigger to the Counter n HW Arm input of the counter.

Routing Signals to Counter n HW Arm Input

Any of the following signals can be routed to the Counter n HW Arm input:

  • AI Reference Trigger
  • AI Start Trigger
  • Analog Comparison Event
  • Change Detection Event

A counter’s Internal Output can be routed to a different counter’s HW Arm.

Some of these options may not be available in some driver software. Refer to Device Routing in MAX in the NI-DAQmx User Manual for more information about available routing options.