IVRD is an instruction to read the parameters of Mitsubishi inverter. IVRD S 1 S2 D n S 1 is the frequency converter station number, which is generally expressed in decimal, and K 1-K3 1 S2 is expressed in hexadecimal, such as H6F, d is a register, such as D 160, and n is a channel number, such as k0k.