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現(xiàn)調(diào)試與一臺(tái)電阻測(cè)試儀無(wú)協(xié)議通訊，碰到如下問(wèn)題。

PLC和電腦通訊沒(méi)有問(wèn)題，發(fā)的數(shù)據(jù)沒(méi)問(wèn)題，也能通上

電腦和電阻測(cè)試儀通訊沒(méi)有問(wèn)題，發(fā)的數(shù)據(jù)也沒(méi)問(wèn)題，也能通上

PLC和電阻測(cè)試儀通訊不了，接線是PLC2     電腦2                 電腦和電阻測(cè)試儀是2,3交叉，5直連

                                                    3           3

                                                    9           5

                                                4,5短接      4,6  7,8 短接

PLC和電阻測(cè)試儀是PLC2               電阻測(cè)試儀3

                               3                              2

                               9                             5

                              4,5短接

已解決，是設(shè)置的問(wèn)題