© National Instruments | 5-35
NI cDAQ-9171/9174/9178 User Manual
Counter n Up_Down Signal
Counter n Up_Down is another name for the Counter n B signal.
Counter n HW Arm Signal
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:
• Any PFI terminal
• 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 the Device Routing
in MAX topic in the NI-DAQmx Help or the LabVIEW Help for more information about available
routing options.
Counter n Sample Clock Signal
Use the Counter n Sample Clock (CtrnSampleClock) signal to perform sample clocked
acquisitions and generations.
You can specify an internal or external source for Counter n Sample Clock. You also can specify
whether the measurement sample begins on the rising edge or falling edge of Counter n Sample
Clock.
If the cDAQ chassis receives a Counter n Sample Clock when the FIFO is full, it reports an
overflow error to the host software.
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