RS232 与 RS485 互相转换，两个端口口能是不同的波特率，编译平台IAR for AVR -RS232 and RS485 conversion, the two ports, port is a different baud rate, compiler platform IAR for AVR

STM32的RS485通信例程程，IAR环境下编辑，可直接使用 -RS485 communication routine process of STM32 IAR environment editor, can be used directly