Modbus+poll+key+full Free

: Support for interfacing with Visual Basic or Excel using Excel macros.

| Software | Free? | Key Feature | |----------|-------|-------------| | | Yes | Open-source, basic Modbus TCP/RTU master. | | CAS Modbus Scanner | Limited | Free for 30 days, simple UI. | | Simply Modbus | No | Cheaper (~$49) but fewer features. | | Node-RED | Yes | Web-based, good for automation. | modbus+poll+key+full