跳转至外部链接
https://www.optcore.net/difference-between-rs-232-rs-422-and-rs-485/https://ipc2u.com/articles/knowledge-base/the-main-differences-between-rs-232-rs-422-and-rs-485/https://www.raveon.com/wp-content/uploads/2019/01/AN236SerialComm.pdfhttps://blog.mensor.co