The remote terminal control system RTU has telemetry, remote control and remote signaling functions. Then the RTU definition standard should have the functions of remote data collection, transmission and control. WCTU is a wireless collection and transmission terminal device. Both analog data acquisition and IO input and output control, as well as wireless communication module, ensure data acquisition and transmission and control functions. It is a wireless acquisition transmission equipment terminal developed by Xiamen (for that) communication for solving the simplified version of PLC+DTU in the field of industrial automation control, saving cost and being compatible with modbus protocol.