Yeah I'm trying exactly that. Took the vfd out of the wiring cabinet and with me into the office. Tested different programs, thanks for mentioning qmodbus. I even took the control board apart to see if there is maybe an error in the manual and the modbus is using other pins of the RJ45 connector than the mentioned pins 1 and 2. But after some fiddling and testing different pins I'am sure pin 1 and 2 are the right pins. Because thats the only combination where I even get ay RX signal. But no matter what I'm doing the only response I get is 00. I also contacted the tech support of the vfd.
P.S. do you know if qmodbus is sending CRC16 after each command?
No idea about the CRC, I rarely use Modbus/RS485 except to program Schnieder VFDs. I'd assume it does or it'd be fairly useless.
I looked at the manual quick, it mentions the H0110 card which looks like the keypad that comes with the drive. There are screw terminals, SG+ and SG- that are the same as pins 1 and 2 of the RJ45 connector, not sure how you're connected but that might be easier to mess with. There's also a jumper to turn RS485 on or off so you might wanna check that. BTW, once you get it working you might wanna check this post, I just happened to see this. Down the page it's mentioned that a parameter needs to be set if using 16bit registers.
forum.linuxcnc.org/24-hal-components/387...modbus-rtu?start=120
