RS-422 是規定4線,全雙工,差分傳輸,多點通信的串行數據通訊協議。RS-422是一種單機發送、多機接收的單向、平衡傳輸規範。傳輸距離可達1200米(4000英尺)。傳輸速率可高達10Mbit/s。
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