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Attention
When the specified number of outputs is completed, the DO output
level state stays at the level defined by the last point of the
waveform data.
Attention
After clearing the DO trigger to the untriggered state, the DO output
level state stays at the level state at which the DO trigger is cleared.
5. Digital Output
（
DO
）
This chapter introduces the digital signal output for the PCI-5000 series data acquisition device. The
digital input is referred to as DO here, the abbreviation of Digital Output.
5.1.
Signal output mode
When the PCI-5000 series data acquisition device is utilized for digital output, the following four
output modes are supported:
Immediate output
Finite number output
Unlimited number of loop output
Infinite non-loop output
The limited output mode and infinite cycle output mode are collectively called n-cycle mode. When
the output number n-cycle is set to 0, AO works in the infinite cycle output mode; When the output
number n-cycle setting is greater than 0, AO works in the limited output mode.
Immediate output
Immediate output refers to the output state without buffer and no waveform. The computer sends a
command to the acquisition device, and it immediately outputs the specified level state.
Finite number output mode
The limited number of output modes means that the digital waveform data to be output is first stored
in the hardware FIFO, then the output sampling rate is set, the number of times the waveform needs
to be output is set, and the channel for outputting the digital waveform is set. After the DO output is
triggered, the capture card begins to output a digital waveform in accordance with the set parameters.
After the set number of outputs is reached, the capture card stops outputting the digital waveform.
Infinite loop output mode
Infinite loop output mode means that the digital waveform data to be output is first stored in the
hardware FIFO, and then the output sampling rate is set. After the DO is triggered, the acquisition
device starts to output the digital waveform according to the set parameters, and continuously loops
the output until the DO triggers cleared to an untriggered state.
