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我能使用二線式模式(2-Wire Mode)於cFP-2020的RS-485埠嗎?



硬體: Compact FieldPoint>>Controllers>>cFP-2020

問題: 我有一個cFP-2020控制器介面,且想在RS-485埠使用二線式接線。我能這樣做嗎?

解答: National Instruments並不正式支援RS-485埠的二線式接法。但您若要這樣做,您必須忽略在cFP-2020的RS-485埠使用二線式時產生的回波(echos)。

您需要在cFP-2020的RJ-45接頭上分別將RXD+和TXD+訊號線短路,且將RX-和TX-短路。


相關連結: KnowledgeBase 2QRAF35F : Is the RS-485 Port on the cFP-2020 Isolated?
KnowledgeBase 1Z5C8IEC : What Is the Pinout If I Want to Convert an RJ45 Serial Connector to DB9 or DB25?


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報告日期: 12/30/2002
最後更新: 05/15/2003
文件偏號: 2STEBNQ2