Competing interests of VFD and XHC-HB04 (with my own ignorance!)

this is the line in my custom.hal. it works.

loadusr -Wn spindle-vfd hy_vfd -n spindle-vfd -t 1 -d /dev/ttyUSB0 -p none -r 9600 -s 1

regards
Mauro

TRAUPMANN00 wrote: The baud and parity have been in a constant of testing.

Yes, but you're specifying even parity in your 'loadusr' command when you have the Huanyang set to no parity:

PD165 = 3 (Set RS485 comms parameters to 8 bits, no parity, 1 stop bit)

loadusr -W hy_vfd -d /dev/ttyUSB0 -p even -r 19200

Try at 9600 baud..mi seems to work only at 9600 .. I had trouble too

I am grateful for all the suggestions, but I have flipped, switched, and maneuvered this baby to every combination suggested and documented as well as a few of my own. I am convinced the Unit is not accepting VFD commands. I have just requested an exchange of the Inverter unit, or I will send the entire bundle back.

I am attempting to work with people in China to resolve my VFD issue. They sent a video that showed the use of some software that could test the communication between the computer and the VFD. I am not able to send the video through this Forum, but I have put it on Google Drive for viewing. You can access it through this link for the next 30 days.
drive.google.com/file/d/1-fgPxOtMKleV74i...RTP/view?usp=sharing

If someone who speaks Chinese you may be able to listen and find out what this software is:

I would like to find similar software for use on a Debian system.
I do not have a PC near the VFD, nor 220V near my PC.
Please let me know.

Software is sscom32.

Try this download link
en.tzonedigital.cn/en/tools/details/10.aspx

There are a number of modbus simulators that turn up on a google search.