Hey Steve, hey all,
Note that with the VFD Yuyong YL620A, it turned out that A and B were reversed. Just to mention it.
One thing is, since the old days of DFÜ with modems, I know serial lines need to be terminated. My VFD has its Termination Resistor on-board, it can be activated with a DIP switch. I do not know whether the Onefinity Controller or the Huanyang VFD have such a Termination resistor built in.
