To use the PWM in Dewesoft, Krypton 4xDO is required. For now this is the only device which is able to output the PWM directly but in the future this will be supported also on Krypton DIDO and Krypton 16xDO.
On the software side, Dewesoft X3 SP5 release or newer version is needed.
The PWM can be enabled in the A/D out module. Go to Settings of the digital out channel and choose the "On" option from the PWM drop down menu. Additional field will appear where you can type the period.
When you go to measure, the duty cycle is 0 by default, but it can be adjusted with the input control display (0-100%):
PWM workaround for Sirius AO channels: