RS-422与RS-485

参考：https://zhuanlan.zhihu.com/p/94746958

https://blog.csdn.net/weixin_39996739/article/details/109885588?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-10.no_search_link&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-10.no_search_link

https://blog.csdn.net/weixin_42124889/article/details/80253009