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RS485-RS422design
- RS-485标准最初由电子工业协会(EIA)于1983年制订并发布,后由TIA-通讯工业协会修订后命名为TIA/EIA-485-A,-The RS-485 standard initially by the Electronic Industries Association ( EIA ) enacted in 1983and released, followed by TIA- Communications Industry Association after revision named