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mapojiang
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12樓  發(fā)表于: 2018-09-07 19:53
引用
引用第11樓云皮兒于2018-09-07 15:00發(fā)表的  :
有沒(méi)有多個(gè)終端   星型接法可能會(huì )干擾通訊

11樓說(shuō)的對，也許是其他終端的故障，通訊電纜接地也要做好，單端接地
sanma
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13樓  發(fā)表于: 2018-09-08 08:58
謝謝大家
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