MODBUS APPLICATION PROTOCOL SPECIFICATION V1
April 26, 2012 1/50 MODBUS APPLICATION PROTOCOL SPECIFICATION CONTENTS 1 Introduction ........................................ ........................................ ...................................... 2 Scope of this document ........................................ ........................................ ........... 2 2 Abbreviations ........................................ ........................................ ................................... 2 3 Context ........................................ ........................................ ........................................ ..... 3 4 General description ........................................ ........................................ .......................... 3 PROTOCOL description.
function_code = [1 byte] MODBUS function code, request_data = [n bytes] This field is function code dependent and usually contains information such as variable references, variable counts, data offsets, sub-function codes etc. The mb_rsp_pdu is defined as: mb_rsp_pdu = {function_code, response_data}, where
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