How to redirect COM port over TCP/IP


There are many scenarios where you may use dedicated COM Port Redirector software for remote access to serial port devices. An example might be RS232 port redirection to a remote computer over the network when a direct connection between PCs is not possible.

When you need to use a serial device that supports the Telnet protocol (RFC 2217) but don’t have the device physically present near your PC, you can connect to it remotely after sharing it over the Internet or LAN with the help of a professional Serial Port Redirector app.

Want to know how you can do this? Below is a simple step-by-step guide.

How to share serial ports over TCP/IP

As you already know, you can redirect serial ports to a remote PC using some dedicated third-party software. One of the most popular solutions that you can find on the market today is called COM Port Redirector (for Linux and Windows operating systems). This app is powered by advanced Serial Port Virtualization Technology which allows connecting to any remote serial port with a device attached like it was your local COM interface and your local peripheral.

In order to redirect COM port over a network, you should take these simple steps:

On your local (server) computer:

  1. Install and start TCP/Serial Port Redirector app. Select Connection > New server connection in the main menu or click Server connection in the Home window. Choose New Server Connection
  2. Choose a name for your connection.

  3. Select the COM port that needs to be shared with remote client PCs.

  4. In the network settings:

    • • Specify the TCP port which will be used to listen for a client connection.

    • • Make sure this port is allowed by your firewall and is not occupied by any other application.

    • • Choose the protocol to redirect COM data. It can be either the Raw data transmission protocol or Telnet protocol with RFC 2217 extension.

  5. Hit the Create button!
Create Server Connection

Once you’ve done it, the serial port becomes available for remote client connections over the TCP/IP network.

Now, on a remote (client) computer:

  1. Start the program and Select Connection > New client connection in the main menu.

  2. Specify the name of the connection you create.

  3. Select which of the local COM ports will be used for the connection.

  4. Enable the Create as virtual port option to have a virtual COM port created in your system. This port will emulate the behavior of a real COM interface and will be used on the client end to exchange data with the remote server’s port.

    If you decided to use a virtual serial port, we recommended that you enable the Strict baudrate emulation option to prevent potential data loss when communicating with a real serial interface.

  5. Choose the data transmission protocol.

  6. Type the computer name or IP address of the server you are going to connect to and the TCP port you’ve chosen when creating the Server connection.

  7. Click Create!

That’s it! Now the client computer is connected to the server PC over a TCP/IP channel. This means whatever serial device you connect to the COM port shared on the server, it will appear on the client computer as though the peripheral were attached directly to that machine.

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