MOS General Modbus & Jbus Master 2.1

MOS General Modbus & Jbus Master is a practical communication and testing tool for industrial automation. It acts as a master/client for Modbus and JBus networks, helping engineers commission, troubleshoot, and integrate PLCs, RTUs, drives, meters, and gateways across serial and Ethernet links. Designed for field and lab use, it streamlines device setup, verifies register maps, and highlights communication issues with clear diagnostics.

Key features:

• Master communication for Modbus and JBus devices
• Support for common transports, including Modbus RTU/ASCII over serial (RS-232/RS-485) and Modbus TCP over Ethernet
• Read/write of coils, discrete inputs, holding registers, and input registers
• Configurable polling rates, timeouts, retries, and inter-message delays
• Address mapping with labels/aliases to simplify register navigation
• Live monitoring of requests/responses with exception-code decoding
• Data logging and export (e.g., CSV) for analysis and reporting
• Multiple simultaneous sessions for working with more than one device
• Useful during commissioning, maintenance, QA, and troubleshooting

This tool is well suited for anyone who needs a reliable Modbus/JBus master to verify connectivity, validate register values, and diagnose communication problems quickly and confidently.

MOS General Modbus & Jbus Master is developed by Kontron Czech s.r.o.. The most popular version of this product among our users is 2.1. The names of program executable files are GJModbus.exe, GJModbusCfg.exe.