跳转至外部链接
http://mil.ufl.edu/3744/docs/RS232_standard_files/RS232_standard.htmlhttps://www.windmill.co.uk/handshaking.htmlhttps://www.electricaltechnology.org/2020/05/rs232-serial-communication-protocol.htmlhttp://m.emb.hqyj.com/Column/202110291.htmlhttps://zhuanla