Why Modbus works in the lab but fails in the field
Why a Modbus setup can work during testing but fail later in a real installation.
Posts
RS-485 wiring mistakes in real installations
Common RS-485 wiring mistakes that cause Modbus RTU communication problems on site.
Register Map Review Checklist for Manufacturers
A simple checklist manufacturers can use to review Modbus register maps before release.
Modbus troubleshooting checklist
A practical step-by-step checklist for solving common Modbus communication and data problems.
Modbus address offset confusion explained
A simple explanation of why Modbus address numbering causes so many mistakes.
How manufacturers should document scaling, signed values, and exceptions
What device manufacturers should document so integrators do not have to guess how values work.
Common problems with Modbus RTU and how to solve them
A practical guide to the most common Modbus RTU problems and the steps to fix them.
Common Modbus RTU mistakes in device documentation
The most common documentation mistakes that make Modbus devices harder to integrate.
Byte order and word order pitfalls
Why Modbus values can look wrong even when communication itself is working.
10 register map mistakes that break integrations
Ten common register map mistakes that cause Modbus integrations to fail or take longer than they should.
How to test a new Modbus device before release
A practical pre-release test checklist for Modbus devices.
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The purpose of this site is to teach and share automation and programming knowledge through various tools, guides, and articles.