Help with hy_gt_vfd

Hi all, I am still struggling with controlling my VFD over Modbus with a USB to RS485.  I had an older Huanyang VFD that worked great using the hy_vfd component.  Now I have a GT model that does not work I see that there is a component for the GT series hy_gt_vfd.  but it does not work for me I believe if followed the directions and have the VFD and the custom.hal setup correctly.  but I get this error, "Debug file information:
Note: Using POSIX realtime
./custom.hal:5: waitpid failed hy_gt_vfd hy_gt_vfd
./custom.hal:5: hy_gt_vfd exited without becoming ready
2722 "
 
I am thinking I need to install the component somehow?  can someone please help me I am lost.  

loadusr -W hy_gt_vfd -t 1 -d /dev/ttyUSB0 -p none -r 38400

setp hy_gt_vfd.enable 1


net spindle-vel-cmd-rpm => hy_gt_vfd.speed-cmd
net spindle-cw spindle.0.forward => hy_gt_vfd.spindle-forward
net spindle-ccw spindle.0.reverse => hy_gt_vfd.spindle-reverse

net on spindle.0.on => hy_gt_vfd.spindle-on

net spindle-speed-fb => hy_gt_vfd.spindle-speed-fb
net spindle-current <= hy_gt_vfd.output-current
net spindle-comm-ok <= hy_gt_gt_vfd.hygtcomm-ok


net spindle-at-speed <= hy_vfd.spindle-at-speed

Here is what I have for my custom.hal
Is there anything wrong in here?

Sorry, but i have yet to use a VFD with RS485, it is still sitting on a shelf in the shop, waiting....
Also, it is not HY anything, it is Dinverter 2B, the big one in the picture

That looks cool!  I have not seen anything like that before.  
If the hy_vfd component works on with my old YH vfd,  why would the hy_gt_vfd fail with this error, "waitpid failed hy_gt_vfd hy_gt_vfd" 
call is "loadusr -W hy_gt_vfd -t 1 -d /dev/ttyUSB0 -p none -r 38400" does that at least look correct? 

No idea...well i have ideas from experience with serial ports, so first thing i would check is the serial comm parameters, speed, parity and stop bit.
You have to check those on the new VFD, make a note on what they are set to, and change the loadusr line accordingly.
In case you can not get those numbers, i would try
loadusr -W hy_gt_vfd -t 1 -d /dev/ttyUSB0 -p none -r 9600
then increase the speed gradually (see google for standard serial port rates)

@tommtlight.  That did not work.  I am not a coder so this may sound like a stupid question but, is there a way I can see the addresses that is being used for the hy_gt_vfd function?  Or do you think I should give up and try the MB2HAL function to try to control the VFD?