Because a single pair of conductors is used for both transmission and reception, rs485 cable ([Suggested Website](https://www.cap-rs485-imatek-chinh-hang.xyz/2020/10/tong-hop-cac-kien-thuc-quan-trong-ve.html "Suggested Website")) is useful for multi-drop applications in which a master communicates with multiple slave serial devices, or nodes.
RS485 is a half duplex version of RS422 that is capable of multi-drop operation.
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