Modbus is modicom companies have a data transmission method is now used more fieldbus one reason why it was such a successful application, the main reason is because the Modbus protocol is simple, and openness better

modbus51
........\main.c
........\main.h
........\main.LST
........\main.OBJ
........\main.Opt
........\main.Uv2
........\main_Opt.Bak
........\modbus.c
........\modbus.h
........\modbus.LST
........\modbus.OBJ
........\modbus51
........\modbus51.hex
........\modbus51.M51
........\modbus51.plg
........\STARTUP.A51
........\Startup.LST
........\Startup.OBJ

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