Cannot control spindle speed - HY VFD on RS-485

I have a pretty convention setup (I think) with a Huanyang VFD connected via RS-485. Before switching to RS-485 controls, it worked fine from the control panel (on/off, fwd/rev, speed, etc.) but now that I've switch to RS-485, I cannot control the speed. I CAN turn the spindle on/off and set the fwd/rev directions from the Axis GUI. When I press the + and - buttons, I can see the speed changing in the "Spindle Speed:" GUI, but the spindle itself does not change; it's always at the minimum.

Here's a screenshot which shows the GUI, custom.hal, and some HAL display from Axis.

custom.hal:
loadusr -Wn vfd hy_vfd -n vfd -d /dev/ttyUSB0 -p none -r 9600
#type, name              val: source           >  destiantion
net  spindle-cmd-rpm-abs spindle.0.speed-out   => vfd.speed-command
net  spindle-fwd         spindle.0.forward     => vfd.spindle-forward
net  spindle-rev         spindle.0.reverse     => vfd.spindle-reverse
net  on                  spindle.0.on          => vfd.spindle-on
setp vfd.enable 1

Any ideas here?

Thanks


 

I figured out the problem and I'll post it in case anyone else runs into something similar.

TL&DR: It was working all along, but the +/- increments were so small and that the set speed was always less than the minimum. If I clicked + enough times, I would eventually get it past the min and the spindle would speed up.

The longer version is that on a whim, I ran the default "LinuxCNC" carve program, and surprisingly, the speed ramped right up to 10000 RPM (not the minimum 6000). So, that told me that the speed was actually under CNC software control. The I enabled the spindle manually from the GUI and just kept clicking + until the spindle passed the min. The LED display on the VFD tracked the GUI as well.

So, a frustrating few nights of debugging, but I learned a lot about how this thing works under the hood!