Thanks for your help but your program is not working.
1. This is my manual inverter : Manual delta VFD-L https://prom-electric.ru/media/delta_vfd-l_manual_en.pdf, sorry for this
2. I think You have confusion between modbus ASCII mode and modbus RTU mode of inverter delta VFD-L, you can see this at page 61 of manual delta VFD-L. I done with modbus ASCII mode, it is good working and this is my program (see below)
3. Now I'm searching modbus RTU mode, please help me!
modbus ASCII.gxw