Danfoss VLT AQUA Drive Design Manual

Also see for vlt aqua: Instructions Design guide Instruction manual Operating instructions Design guide

Contents

7.10.4. Read Holding Registers (03 HEX)DescriptionThis function reads the contents of holding registers in the slave.QueryThe query message specifies the starting register and quantity of registers to be read. Register addresses start at zero, i.e. registers 1-4 are addressedas 0-3.Field Name Example (HEX)Slave Address 01Function 03 (read holding registers)Starting Address HI 00Starting Address LO 00 (coil address 17)No. of Points HI 00No. of Points LO 03Error Check (CRC) -ResponseThe register data in the response message are packed as two bytes per register, with the binary contents right justified within each byte. For each register,the first byte contains the high order bits and the second contains the low order bits.Field Name Example (HEX)Slave Address 01Function 03Byte Count 06Data HI(Register 40001)55Data LO(Register 40001)AAData HI(Register 40002)55Data LO(Register 40002)AAData HI(Register 40003)55Data LO(Register 40003)AAError Check(CRC)-VLT® AQUA Drive Design Guide 7. RS-485 Installation and Set-upMG.20.N4.02 - VLT® is a registered Danfoss trademark 1657