From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
From Friday, April 19th (11:00 PM CDT) through Saturday, April 20th (2:00 PM CDT), 2024, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
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RS-485預設是設定成四線式的通訊.如同下圖所示,兩個腳位用來發送(TXD+和TXD-),兩個腳位用來接收(RXD+和RXD-)差動的訊號.
為了要連接兩線式的裝置.兩線式裝置上面的發送腳位(TXD)必須要連接到四線式上面的TXD-和RXD-,同理裝置上面的接收腳位(RXD)必須要接到TXD+和RXD+.
因為RS-485 COM port上發送和接收腳位被短路在一起,所以COM port必須要設定成兩線式半雙向資料傳輸模式(2-wire half-duplex mode). 請依據下面的步驟來進行:
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