Question 1

What is modclient?

Accepted Answer

modclient is a free online Modbus RTU testing tool that runs directly in your browser (Chrome or Edge). It allows you to read and write registers, scan the RS485 bus, and automate test sequences without installing any desktop software.

Question 2

Do I need to install any software to use modclient?

Accepted Answer

No installation is required. modclient uses the Web Serial API built into modern browsers (Chrome 89+ and Edge 89+) to communicate directly with USB-RS485 converters.

Question 3

Is modclient a free Modbus tool?

Accepted Answer

Yes. modclient offers a free plan with no time limit that includes register access, the frame console, and basic automations. Paid plans (Pro and Industrial Elite) unlock advanced features like unlimited projects, auto-polling, and CSV/JSON export.

Question 4

Is modclient an alternative to QModMaster or Modbus Poll?

Accepted Answer

Yes. modclient provides similar core functionality to QModMaster, Modbus Poll, and ModScan — but runs entirely in the browser. This means it works on any operating system (Windows, macOS, Linux) without requiring installation or a license purchase.

Question 5

Which USB-RS485 adapters are compatible?

Accepted Answer

modclient works with any USB-RS485 converter that exposes a virtual serial port and is supported by the Web Serial API. Common compatible adapters include those based on FTDI FT232, CH340, CP2102, and Prolific PL2303 chipsets.

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