使用共享Clo获得数字数据ck

This example shows how to share the clock with the analog input subsystem on your device with the digital subsystem to acquire clocked data that is automatically synchronized. You do not need any physical connections to share the clock. For more information, seeAutomatic Synchronization.

Create a DataAcquisition object and add a digital input line from port0line0onDev1.

d = daq("ni"); addinput(d,"Dev1","Port0/Line0","Digital")

Note

Not all devices support clocked digital I/O operations with hardware timing. For these devices you can use software timed operations with single scan calls toreadandwrite.

Devices that support clocked digital I/O operations might not support them on all ports. Check your device specifications.

Add an analog input channel to your DataAcquisition.

addinput(d,"Dev1",0,"Voltage"); d.Channels

ans = Index Type Device Channel Measurement Type Range Name _____ _____ ______ _____________ ________________ __________________ __________________ 1 "dio" "Dev1" "port0/line0" "InputOnly" "n/a" "Dev1_port0/line0" 2 "ai" "Dev1" "ai0" "Voltage (Diff)" "-10 to +10 Volts" "Dev1_ai0"

Read and plot the acquired digital data. The device acquires digital data at the scan rate determined by its analog subsystem.

dataIn = read(d,seconds(1),"OutputFormat","Matrix"); plot(dataIn(1:100,1))% Column 1 is data from the first channel.

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Synchronization