6SE6440-2AD25-5CA1

當(dāng)信號沿的到達(dá)時間受到處理該信號沿的數(shù)據(jù)模式影響時，會發(fā)生碼間干擾（ISI）。對于采用長電纜互聯(lián)的應(yīng)用，碼間干擾效應(yīng)變得越來越明顯，使其成為影響RS-485網(wǎng)絡(luò)的關(guān)鍵因素。更長的互聯(lián)會產(chǎn)生RC時間常數(shù)，其中電纜電容在單個位周期結(jié)束時沒有充滿電。在發(fā)射數(shù)據(jù)只由時鐘組成的應(yīng)用中，不存在這種碼間干擾。碼間干擾也可能由電纜傳輸線上的阻抗不匹配（因?yàn)槎探鼐€或終端電阻使用不當(dāng)）引起。具備高輸出驅(qū)動能力的RS-485收發(fā)器一般可以幫助大限度降低碼間干擾效應(yīng)，因?yàn)樗鼈儗S-485電纜負(fù)載電容充電時所需的時間更短。

峰峰抖動容差的百分比與應(yīng)用高度相關(guān)，一般使用10%抖動作為衡量RS-485收發(fā)器和電纜性能的基準(zhǔn)。過度抖動和偏斜會影響接收端RS-485收發(fā)器的采樣性能，增大發(fā)生通信錯誤的風(fēng)險。在正確端接的傳輸網(wǎng)絡(luò)中，選擇經(jīng)過優(yōu)化的收發(fā)器，以大限度降低收發(fā)器脈沖偏斜和碼間干擾效應(yīng)，才能實(shí)現(xiàn)更可靠、無錯的通信鏈路

6SE6440-2AD25-5CA1

VARIAN  E11001000

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