实现两台单片机之间的串口通信，一号机控制二号机二极管，二号机控制一号机数码管-Between the two single-chip serial communication, the Unit 1 control diode of Unit 2, Unit 2 Control Unit 1 digital tube

The HART Application Guide has been created by the HART Communication Foundation (HCF) to provide users of HART products with the information necessary to obtain the full benefits of HART digital instrumentation. The HART communication proto