Create a Counter Output Channel

Usedaqto create a DataAcquisition. Useaddoutputto add a counter output channel withPulseGenerationmeasurement type, andaddinputto add an analog input channel to monitor the pulse generated by the counter output channel. For this example, use CompactDAQ chassis NI c9178 and module NI 9402 with ID cDAQ1Mod5 for the pulse generation and NI 9205 with ID cDAQ1Mod1 for the voltage input.

dq = daq("ni"); addinput(dq,"cDAQ1Mod1","ai0","Voltage"); ctr = addoutput(dq,"cDAQ1Mod5","ctr0","PulseGeneration"); dq.Channels

ans = Index Type Device Channel Measurement Type Range Name _____ ____ ___________ _______ _________________ __________________ ________________ 1 "ai" "cDAQ1Mod1" "ai0" "Voltage (Diff)" "-10 to +10 Volts" "cDAQ1Mod1_ai0" 2 "co" "cDAQ1Mod5" "ctr0" "PulseGeneration" "n/a" "cDAQ1Mod5_ctr0"

Determine the Terminal of the Counter Output Channel

To connect the output signal to the correct terminal, examine theTerminalproperty of the counter channel. The terminal is determined by the hardware.

ctr.Terminal

ans = 'PFI0'

Clocked Counter Output

Use counter output channel 0 to generate a fixed pulse width modulated signal on terminal PFI0. Trigger the motor after 0.5 seconds, with a 75% duty cycle.

ctr.Frequency = 10; ctr.InitialDelay = 0.5; ctr.DutyCycle = 0.75;% StartForeground returns data for input channels only. The data variable% will contain one column of data.start(dq,"Duration", seconds(1));whiledq.Running pause(0.1);enddata =阅读(dq,秒(1));plot(data.Time, data.Variables);