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zyk330860
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樓主  發(fā)表于: 2015-12-21 13:21
RT Modbus RTU相對ASCII來(lái)說(shuō)傳輸速率要高一些,但是由于A(yíng)SCII協(xié)議有開(kāi)始標志和結束標志,所以一個(gè)數據包之間的各字節間的傳輸間隔時(shí)間可以大于1秒,而MODBUS RTU方式下,由于沒(méi)有規定開(kāi)始和結束標記,所以協(xié)議規定每?jì)蓚(gè)字節之間發(fā)送或者接收的時(shí)間間隔不能超過(guò)3.5倍字符傳輸時(shí)間。如果兩個(gè)字符時(shí)間間隔超過(guò)了3.5倍的字符傳輸時(shí)間,就認為一幀數據已經(jīng)接收,新的一幀數據傳輸開(kāi)始,所以RTU方式下兩個(gè)字節間傳輸間隔有時(shí)間要求。MODBUS 的ASCII和RTU兩種協(xié)議的這一區別可能決定某些應用場(chǎng)合只能選用其中一種協(xié)議,那么問(wèn)題來(lái)了,應該怎樣選擇呢,哪位大俠能給舉一下比較好的例子呢? 還有就是用臺達的PLC選擇RTU的話(huà)效果如何,望賜教~~~
zhangshan999
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1樓  發(fā)表于: 2015-12-25 19:27
臺達走的是三菱的路線(xiàn),可以?xún)煞N都行,現在的變頻器RTU的多。臺達plc需要看支持CRC校驗碼,才行RTU.

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