Modbus TCP
Ethernet/IP connection to devices and gateways
ProtoLink 1.1.0 · Modbus TCP · Modbus RTU
A local tool for Modbus TCP/RTU
ProtoLink runs locally on your computer, opens in a browser, and lets you quickly test Modbus TCP/RTU devices without cloud or intermediary services
What ProtoLink does
A practical set for connectivity, address, and basic operation checks with Modbus devices
Modbus RTU
Serial connection through COM ports and USB-RS485
Network Scanner
Helps find devices and services on the local network for subsequent connection checks.
Local web UI
The interface opens at 127.0.0.1:8000
Data reads
FC01 coils, FC02 discrete inputs, FC03 holding registers, and FC04 input registers
Write operations
Single and multiple writes for coils and holding registers
Exchange Monitor
Shows Modbus requests and responses while diagnosing communication.
Diagnostics
Connection status, activity log, last poll time, error count
Quick start
01
Download the package for your OS
02
Install or unpack
03
Start ProtoLink
04
Open 127.0.0.1:8000
Platforms and artifacts
Windows
Available- Version
- 1.1.0
- Filename
- protolink-1.1.0-win64.zip
- Size
- 16.6 MB
- SHA256
- 725fad48c311efe0dda24b225057eb162f9c6d490880e42ed4f4a596d5e8d5a8
- Requirements
- Windows 10/11 x64
Linux
Available- Version
- 1.1.0
- Filename
- protolink_1.1.0_amd64.deb
- Size
- 16.9 MB
- SHA256
- 0aff94140179cc8376045a2ec3b52ab4603f1dee9a188f88551fc6fa43902b09
- Requirements
- Debian 10+, Ubuntu 20.04+, Astra Linux 1.7/1.8
macOS
Available- Version
- 1.1.0
- Filename
- protolink-1.1.0_arm64.dmg
- Size
- 19.8 MB
- SHA256
- ca2504ceb6327a31508fc40dce1189d446d1e79920da198c7176181be997eed7
- Requirements
- macOS arm64 (Apple Silicon)