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12樓  發(fā)表于: 2021-04-26 08:54
Modbus協(xié)議包括ASCII、RTU、TCP。

　　標準的Modicon控制器使用RS232C實(shí)現串行的Modbus。Modbus的ASCII、RTU協(xié)議規定了消息、數據的結構、命令和就答的方式，數據通訊采用Maser/Slave方式。

　　Modbus協(xié)議需要對數據進(jìn)行校驗，串行協(xié)議中除有奇偶校驗外，ASCII模式采用LRC校驗，RTU模式采用16位CRC校驗。

　　ModbusTCP模式?jīng)]有額外規定校驗，因為T(mén)CP協(xié)議是一個(gè)面向連接的可靠協(xié)議。

　　TCP和RTU協(xié)議非常類(lèi)似，只要把RTU協(xié)議的兩個(gè)字節的校驗碼去掉，然后在RTU協(xié)議的開(kāi)始加上5個(gè)0和一個(gè)6并通過(guò)TCP/IP網(wǎng)絡(luò )協(xié)議發(fā)送出去即可
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