Here’s a useful list of tools to use with Modbus devices:
- CAS Modbus Scanner (download)
- Allows us to retrieve coils, inputs, holding registers, and input registers from a Modbus enabled device.
- Modbus RTU Parser (download)
- Allows us to analyze an RTU message and see what type of message it is, if there are any errors, what device the message came from, etc…
- Modbus TCP Parser (download)
- Allows us to analyze an TCP message and see what type of message it is, if there are any errors, what device the message came from, etc…
- Wireshark (homepage)
- Used for capturing Modbus TCP messages coming through the ethernet port.
- A full list of the captured data can be found here.
- Modbus Specification (pdf)
- Official specification of the Modbus Application Protocol
- Nerds In Control (homepage)
- Very useful community website for automation professionals.
- An excellent place to ask for Modbus help or help others with their Modbus problems.
- Modbus Simulator (download)
- Used for simulating a Modbus server for testing and learning purposes.
- Simply Modbus (download)
- Good Modbus TCP and RTU software, an alternative to our CAS Modbus Explorer and Scanner.
- Website provides good tutorials on Modbus.
- Capturing with serial connections (tutorial)
- How to capture Modbus messages with a serial connection using free tools like PuTTY.
- Modhopper (info)
- Allows connecting up to 128 Modbus devices through wifi to any Modbus network.
Feel free to suggest other tools that you find useful and I will add them to the list.