User Manual of EM730 Series Inverter The register data in the response message is divided into two bytes in each register. The first byte of each register includes high-order bits and the second byte includes low-order bits. Request PDU Response PDU N* = number of registers Error PDU Below is an example of a request to read the registers F19.00 to F19.05 (relevant information about the last protection):
371 Function code 1 byte 0x03 Starting Address 2 bytes 0x0000 - 0xFFFF Number of registers 2 bytes 1 - 16 Function code 1 byte 0x03 Number of bytes 1 byte 2×N* Register value N*×2 bytes Error code 1 byte 0x83 Exception code 1 byte 01, 02, 03 or 04 Request Respond Domain name (0x) Domain name (normal) (0x) Domain name (abnormal) (0x) Function code 03 Function code 03 Function 83 Starting address Hi 13 Number of bytes 0C Exception code 03 (example, the same below) Starting address Lo 00 Register value Hi (F19.00) 00 Number (Hi) of registers 00 Register value Lo (F19.00) 11 Number (Lo) of registers 06 Register value Hi (F19.01) 00 Register value Lo (F19.01) 00 Register value Hi (F19.02) 00 Register value Lo (F19.02) 00