cp -r QmodMaster.app /Applications/

Then connect QModMaster to /tmp/ttyV0 and a slave simulator to /tmp/ttyV1 .

"Need a Modbus master for Mac? QModMaster offers robust features for macOS, including: Support for Modbus TCP and RTU/ASCII. Multi-tabbed interface for monitoring multiple devices. Comprehensive register monitoring and modification." 4. Social Media/Actionable

If compiling from source feels like too much work, there are native Mac apps available directly on the App Store or via web download: QModMaster download | SourceForge.net