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519995975
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樓主  發(fā)表于: 2021-07-31 22:14
接線(xiàn)：RS485A接 RT\B,RS485B接RT\A
作為主站要用 Modbus_comm_Load指令 要在這背景數據塊里面 靜態(tài)里把MODE改4默認是0.
REQ最好是用脈沖 通一次
Modbus_Master才是跟從站通信交換數據用的指令， MD_ADDR是從站 站號地址也就是另一個(gè)設備的站號
MODE表示模式也就是功能碼 西門(mén)子把標準modbus 協(xié)議 讀組合到模式0 寫(xiě)組合到1里面了 所以modus功能碼常用的就是 【0：讀取】【1：寫(xiě)入】
DATA_ADDR表示要讀的從站地址起始位置
DATA_LEN表示讀取數據長(cháng)度

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