ICP DAS USA I-8088W Api Reference Manual page 21

Step 3: Start the PWM
You can enter "1" to start the PWM output. It will start PWM when received an
external trigger signal.
Start the PWM:
Using the i8088W_PWM_Start ( section 3.11) or
pac_ i8088W_PWM_Start ( section 4.11)
function.
Stop the PWM:
Using the i8088W_PWM_Stop ( section 3.12) or
pac_ i8088W_PWM_Stop ( section 4.12)
function.
In Normal PWM mode, the signal will continue transfer until you go back to
enter "2" to stop the PWM output.
I-8088W API Reference Manual, Version 1.0.0, Aug. 2010 --- 21