our company want to use single chip microcomputer and V90 modbus communication, address 40100 I wrote into servo control word there is no reaction, ipos mode, write 0 x46e, write 0 x46f again, I doubt the address has a problem, because other register I've tested, no problem, such as address, 40800, when the address of the modbus communication to write 800, I suspect the mapping problem lead to write the wrong register, ever know brother talk about