Parsing Modbus Floating Point Values (Endianness Guide)

Modbus floating point values present a significant integration challenge due to non-standardized endianness across industrial devices. This guide provides the definitive technical breakdown required for system analysts integrating control systems. We dissect the four primary 32-bit IEEE 754 float permutations arising from register word swapping and internal byte swapping. Learn the exact byte sequences for Big Endian Standard (4321), Big Endian Word Swap (2143), Swapped Word Big Endian (3412), and Swapped Word Little Endian (1234). Detailed implementation strategy covers raw byte buffer handling and practical application using Python's struct module for reliable conversion. Includes a systematic debugging checklist to identify unknown device endianness using known test values, ensuring robust Modbus data parsing implementation. 00:00: Modbus Float Data Challenge 00:59: 32-bit Register Pairing 01:52: IEEE 754 Byte Standard 02:36: Big Endian Standard Format 03:15: Big Endian Word Swap 03:53: Swapped Word Big Endian 04:42: Swapped Word Little Endian 05:29: Buffer Handling Implementation 06:11: Python Struct Module Mapping 07:09: Systematic Endianness Identification ##Modbus ##Endianness ##IEEE754 ##IndustrialIT ##SystemAnalysis ##DataParsing ##Industry40