RS-485:
TIA-485-A, also known as ANSI/TIA/EIA-485, TIA/EIA-485, EIA-485 or RS-485, is a standard defining the electrical characteristics of drivers and receivers for use in balanced digital multipoint systems.
en.wikipedia.org
EIA-485:
EIA-485（过去叫做RS-485 或者RS485）是隶属于OSI模型物理层的电气特性规定为2线，半双工，多点通信的标准。
zh.wikipedia.org
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RS-485EIA-485