No speed control on xhc-wb04b-6 pendant on 3 axis router

A friendly warning, Mesa 7i77 can output negative voltages up to -10V, and most VFD's will complain about it vigorously and sometimes with smoke signals, so it would be advisable to wait for someone more experienced on how to limit the Mesa output going negative by probably editing the hal file and/or even using ABS component.

NWE wrote:

 
I'm still amazed a 10mA signal could smoke like that.

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It is enough to start a chain reaction, same as throwing a wrench on any complicated machinery, no matter how small.
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As for the subject, i used a Mesa 7i77 to drive a car power amplifier as a servo drive, so i had to limit voltage from going above +-2V and it worked pretty good, given the limited current those amplifiers can deliver (it will trigger over current on any faster move), but i forgot how i did the limiting in hal, pretty sure it was the MAX and MIN OUTPUT set to 2, but fuzzy on what else.
I also did 0 to +5V and it also worked, but tried with those arduino PWM drives and that did not work as analog and PWM are not the same, you can do analog from PWM easily with an RC, but not vice versa.
This was probably 10 or more years ago...