Abstract
This article describes a design about a system of power line carrier communication, The hardware and software design of microcontroller is used STC dual-port MCU. Power line carrier chip is ST7540. In this design MCU can be properly read and write control register of ST7540. We can control the carrier frequency, baud rate, mode, (synchronous or asynchronous) through controlling the internal control registers of ST7540.System also adds a LCD display circuit, the key circuit, buzzer detection circuit to make it’s function more perfect .After ceramic ring coupling, Data transmission can be achieved through the power line, data can be communication between different place .the system is reasonable, simple, safe and reliable.
Keywords：power lines , carrier communication, ST7540, carrier communication
