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ModbusTCP monitoring program
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Application background Here first code file first look at it. TCP protocol sample is as follows:The request and response with a prefix of six bytes are as follows:0: byte; transaction identifier - replication by the server - typically 01: byte; transaction identifier - replication by the server - typically 02: byte; protocol identifier = 03: byte; protocol identifier = 0Byte 4: length field (half byte) = 0 (all message length is less than 256)5: byte; length field (lower part) = the number of bytes in the back6: byte; unit identifier (original "slave address")7: byte; MODBUS function codeByte 8 on: the required data Thus processing the sample "to 4 of the offset from the UI 9 read the 1 register" return the
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