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永不放棄hhj
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樓主  發(fā)表于: 2024-12-03 11:17
用三菱3u 做Modbus通訊時(shí)，用m8002上電初始化，自動(dòng)檢測從站數量，這個(gè)程序如何寫(xiě)。我準備用for循環(huán)向從站發(fā)送開(kāi)機狀態(tài)報文，依據有沒(méi)有返回報文，來(lái)確定從站是不是存在。不知道前輩們是怎么處理這個(gè)問(wèn)題的
溫柔的郎
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1樓  發(fā)表于: 2025-02-05 15:51
這個(gè)方法就是個(gè)死胡同，無(wú)解！
主站測試了從站的，主站記錄了從站站號的，那這個(gè)從站掉線(xiàn)了咋辦呢？
掙錢(qián)做法是
   不用測試從站在線(xiàn)與否，需要時(shí)，就向從站發(fā)送命令即可，有返回數據即可，
   無(wú)返回數據，再發(fā)2次，都無(wú)返回數據，跳過(guò)此站即可。

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