It is a PWM signal 0 to 5 volts. Rather than setup an RC circuit to get an analog voltage I am measuring the low time and high time and then finding the duty cycle from there. Just curious if the command waits for a transition to start the timer, or if it starts whenever the pin is in the desired state even if it has been there for some time. It actually works very well. I just wanted to understand the command a little better. The manual says that it turns off on a transition, but it doesn't say if the timer turns on on a transition.