Modbus高级通讯教程
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wwwplcworldcn 1 Protocol Communication PLC Programmable Logical Controller PLC PLC Modicon PLC 2 Modbus Modicon PLC 11 RS232C Ethernet 21 Bit Data Bit Parity Bit Stop Bit Byte Start z z Bit Byte wwwplcworldcn z z z z z 1111001 12 Start Stop 1 Byte 1 0 0 Baud Rate 1 1 0 None Odd Even Parity Data Bits 5 6 7 8 Stop Bits 1 15 2 ASCII Code 7 ASCII 1 9600 bps 0 1 7 8 ABC None 8 wwwplcworldcn 1 0 7 ASCII 22 SDLC HDLC F 8 SYN 16 0x16 8 SYN SYN SYN 13 F 14 1 8 8 wwwplcworldcn 20 48 HDLC ......
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