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廈門泰尼電氣有限公司
主營產(chǎn)品: AB模塊PLC |
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廈門泰尼電氣有限公司
主營產(chǎn)品: AB模塊PLC |
參考價 | 面議 |
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更新時間:2018-05-30 03:22:45瀏覽次數(shù):378
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140XBE10000---140XBE10000
140XBE10000---140XBE10000
做好編程電纜,首先要大概了解一下這三種串行通信接口標準。RS-232、RS-422與RS-485是三種串行數(shù)據(jù)接口標準,接口標準只對接口電氣特性做出規(guī)定,而不涉及接插件、電纜或協(xié)議,同樣一種接口標準可以有不同物理結(jié)構,如DB-9 、DB-25等。
:張亮(工程師) 專線:
24小時移動專線: 【】
RS-232是PC機與通信工業(yè)中應用zui廣泛一種串行接口, RS-232C總線標準設有25條信號線,包括一個主通道和一個輔助通道。多數(shù)情況下只使用主通道,常用九條信號線(九針D形口),各引腳定義如表一所示。一般雙工通信,僅需幾條信號線就可實現(xiàn),如發(fā)送數(shù)據(jù)線 TXD 和接收數(shù)據(jù)線RXD以及邏輯線GND,RS232C只能點對點通訊,傳輸距離短,共模抑制能力差。
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