Comm Tunnel is a free data-routing and conversion utility developed by Serial Port Tool that builds a communication bridge (tunnel) between different network and hardware endpoints. It is widely used by developers and engineers to link serial communication channels (COM ports) with standard internet network protocols. 🛠️ Core Functionality & Supported Endpoints
The software routes data streams bidirectionally between any combination of the following four endpoint types:
Serial Ports (COM Ports): Connects physical RS232/RS485/USB-serial devices or virtual COM ports.
TCP/IP Server: Listens for incoming internet socket connections.
TCP/IP Client: Actively initiates a connection to a specific remote server IP and port.
UDP: Transmits connectionless data packets directly across a network.
Because endpoints can be mixed and matched, it allows for cross-protocol configurations such as COM2TCP, COM2UDP, TCP2TCP, TCP2UDP, and UDP2UDP. 💡 Common Use Cases
Hardware Debugging: Monitoring or mirroring data traveling between a desktop application and physical hardware.
Legacy Device Modernization: Mapping old RS232 serial devices to communicate smoothly over Ethernet, Wi-Fi, or cellular networks.
Interface Splitting: Distributing data received from one master endpoint out to multiple distinct receiving targets simultaneously. 📋 Key Features
Multi-Format Data Logging: Displays data flows natively in Text, Hexadecimal, and Decimal formats for fast debugging.
Automation Ready: Supports loading custom configurations from a command-line interface.
Background Operation: Can be deployed to run automatically as a native Windows Service Application. 💎 Comm Tunnel Pro vs. Free Version
While the base version is entirely free, Serial Port Tool offers a paid Pro edition. The Pro version adds advanced capabilities like slave/mirror connections (allowing you to isolate and spy on communication lines without interrupting the traffic) and support for a higher volume of simultaneously mapped endpoints.
(Note: If you are instead researching network architecture or data backup, “Comm Tunnel” may refer to Commvault’s Network Proxy/Tunnel connection system, which handles secure, encrypted HTTPS data pipeline transfers between CommCell server components and remote clients.) If you are setting this up for a project, tell me:
What types of endpoints are you looking to connect (e.g., a physical COM device to a remote server)?
Do you need to log and monitor the data packets, or just pass them through silently?
I can give you step-by-step instructions for configuring your specific data pipeline. Comm Tunnel Freeware – Serial Port Tool
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