This manual explains the Modbus communication functions and usage of the Conch Electronic VM-Series multifunction electricity meter.
The document provides a detailed description of the communication module for the VM‑Series multifunction electricity meter. It introduces the Modbus half‑duplex protocol, address (station) numbers, function codes, data formats and wiring recommendations for reliable communication with a master controller.
It also defines the message structure, timing requirements, CRC error‑checking method and includes example command frames for reading coils, registers and setting values. A C‑language routine for CRC calculation is provided, along with tables of supported address ranges and function codes. This manual is written in Chinese.