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I was reading Modbus protocol specification version 1.1b3. It is mentioned that function codes 1 - 65, 73 - 100, 111 - 127 are public function codes and they are publicly documented except function codes 9, 10, 13, 14, 41, 42, 90, 91, 124, 126, 127 as they are reserved function codes. I want information regarding the function codes which are publicly defined but not reserved such as function codes from 30 - 40. The document does not contain any information regarding it. Kindly mention where can I find the relevant information......