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Questions about Modbus TCP/RTU connections, RS-485 adapters, register decoding, CLI scripts or bug reports. Include your Windows/Android version and a hex log if possible.
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Questions about Modbus TCP/RTU connections, RS-485 adapters, register decoding, CLI scripts or bug reports. Include your Windows/Android version and a hex log if possible.
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Direct email channels for technical support, licensing/invoices, volume quotes, and SCADA engineering.
Modbus master, traffic monitor, scanner, logger and slave simulator for Android phones and tablets.
Complete overview of transports, 11 data types, byte orders, Device Tools, simulator, trends and CLI.
Instant browser tools: Modbus RTU CRC-16 calculator, 4xxxx address converter, and Float32 byte-order decoder.
Scriptable CLI reference for automated testing, JSON/CSV logging, device scans and CI pipelines.
Technical reference covering connections, workspaces (.mbws), data types, scaling, and troubleshooting.
Step-by-step illustrated manual with annotated screenshots and downloadable PDF.
Read Device Identification (FC43/14), Report Slave ID (FC17), Diagnostics (FC08), Mask Write (FC22) and raw requests.
Built-in register templates for popular energy meters, solar inverters, and variable-frequency drives.
Understand 0-based, 1-based and Modicon 4xxxx notation and fix off-by-one register errors.
Detailed breakdown of standard read/write function codes and diagnostic function codes.
How to decode 32-bit and 64-bit integers and floats across Big-Endian, Little-Endian and word-swapped devices.
Field guide to RS-485 2-wire daisy chains, A/B polarity swaps, 120 Ω termination and ground reference.
Step-by-step commissioning checklist for diagnosing TCP and serial RTU timeouts using raw hex frames.
What exception responses 01, 02, 03, 04, 05, 06, 0A and 0B mean in hex frames and how to resolve them.
Compare Modbus frame structures, serial vs Ethernet transports, and when to use RTU-over-TCP.
How to simulate multi-unit Modbus slaves with value generators and exception injection for FAT/SAT.
Side-by-side comparison of ModbusBB 2.1 and Modbus Poll for Windows commissioning engineers.
Meet the SCADA/SAS electrical engineer behind ModbusBB and explore other Max Energic tools.