利用protel制作的232串口到485串口的收发转换电路，利用的3.3V的MAX3326,功耗小，稳定性高，带有光耦隔离-Protel produced using to 232 send and receive serial conversion circuit 485, the use of 3.3V, MAX3326, power consumption, high stability, with optical isolators

max485 的数据说明书 知道用户使用该芯片 开发串口通讯-max485 datasheet

基于MAX485的双机通信软件的设计，对于初学者具有一定的参考作用-Two-machine communication MAX485-based software design for beginners with some reference

1.利用MAX232实现单片机与微机的串行通讯，借助串口调试助手软件正确接收发送数据.2.使用单片机和MAX485建立距离不低于5米的串行通信系统。-1 using MAX232 to achieve the serial communication between the microcontroller and the computer, with the help of serial debugging assistant software to receive and send data