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nihaohao
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樓主  發(fā)表于: 2010-04-29 23:45
我使用的是三菱Q系列的PLC,采用RS485與20臺儀表進(jìn)行通訊,我選的串口模塊是QJ71C24N,通訊協(xié)議采用無(wú)順序通訊協(xié)議,
我在其它網(wǎng)站也找到了三菱Q系列PLC與山武溫控儀表的通訊文章,說(shuō)的有一點(diǎn)我不太明白,雖然我也清楚數據是從哪個(gè)C24模塊的RS485端口采集來(lái)的,但
我沒(méi)看出讀取的數據是哪塊儀,比如:這20個(gè)儀表中,我只讀取第六塊儀表的數據,哪我怎么編程呢?
我附上一個(gè)這方面的說(shuō)明文章,但我從中沒(méi)看出數據到底是從哪塊儀表讀取出來(lái)的!!!
請大家幫忙解決一下,謝謝!
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附件: 三菱QPLC與山武溫控儀的通訊.rar (271 K) 下載次數:1963
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菜鳥(niǎo)888
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1樓  發(fā)表于: 2010-05-09 19:14
RKC 通過(guò)一轉換器可以與QJ71C24N(RS485)連接24臺

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