Tibbo Serial-over-IP (SoI) and Solutions:
Device Servers and Virtual COM Ports

Network-Enable any Serial Device!

RS232 ports may have disappeared from your PC but serial interfaces continue to be widespread in many industries such as automation, security, and IT.

Tibbo's serial-over-IP (serial-over-TCP/IP, COM port over IP) solutions marry the simplicity of serial communication with the TCP/IP networking of the Internet age.

We supply external SoI controllers (a.k.a. "device servers", "serial converters","rs232 over ip", "ip converter") and SoI boards.

Because our SoI devices offer optional Wi-Fi and GPRS connectivity, we refer to them as serial-over-IP, and not just serial-over-Ethernet products.

* Some prefer to call them "Ethernet-to-serial modules".

There are three basic ways in which you can use Tibbo Serial-over-IP devices. Each of the methods described below is fully supported by the Tibbo Device Server Toolkit (TDST) Windows software and its Connection Wizard – a scenario-based configuration helper that will have your Tibbo device server up and running literally in no time at all.

Linux OS is supported as well.

Virtual Serial Ports for Windows

Our Virtual Serial Port Driver (VSPD) and virtual com port for Windows allow you to access your device server serial port as if it was a real COM port of your PC. Linux virtual serial port driver is also available.

Direct TCP and UDP links

All Tibbo serial-over-IP devices support standard TCP and UDP protocols, so you can open a socket and exchange data with the serial port of your device server directly. No driver needed.

Device-to-device links

A pair of Tibbo device servers can talk to each other directly, using TCP or UDP protocols. This creates a virtual serial link that can span a room, a building, or the entire planet.

Versatile Hardware

All Tibbo SoI products, currently in their third generation, feature an Ethernet port as the standard means of networking. Wi-Fi and GPRS connectivity are offered as options available on many of our devices.

Our serial-over-IP devices offer from 1 to 4 serial ports or channels. You can choose between TTL, RS232, RS485, ethernet to rs232, or universal RS232/422/485 ports.

Serial to Ethernet Modules and Devices

Channels: Squeezing Multiple Serial Ports Onto a Single DB9

Devices supporting this feature have a single DB9M connector and are priced as single-port products, yet pack several independent serial channels.

Have no use for those DSR and DTR lines? Turn them into RX and TX lines of an additional serial channel. Don't want CTS and RTS either? That's one more RX/TX pair!

Our serial-over-IP (SoI) application defines 15 different configurations or "port mappings" to choose from, starting from a standard single-channel configuration (RX, TX, CTS, RTS, DSR, DTR, and DCD) and ending with the 3.5-channel setup (RX, TX, RX2, TX2, RX3, TX3, and RX4).

Splitting wires can be conveniently carried out with the TB1100 adaptor.

Serial-over-IP (SoI) application firmware

Here are the main features of the serial-over-IP (SoI) application offered with our 3rd-generation* (BASIC/C-programmable) devices:


Support for Ethernet, Wi-Fi, PPP (GPRS) and PPPoE ("ADSL") networking.

Serial ports (channels)

  • Up to four serial ports or channels.
  • Full- and half-duplex serial port modes (for RS232, RS422, and RS485 communications).
  • Remote control of RTS, CTS, DTR, and DSR lines.
  • "On-the-fly" network-side commands for immediate change of the serial port configuration (baudrate, parity, etc.).
  • Serial-side "modem" commands for the control of network links.


  • Configuration storage in the EEPROM
  • Setup through the serial port or network commands.
  • Network-side configuration via a web browser, Telnet, or UDP commands (DS Manager utility).

Status indication

  • Detailed status indication via LEDs and optional LCD/OLED displays.

* 1st- and 2nd-generation devices have a slightly different feature set.

3rd-Gen SoI App is Open-Source!

There is more to our 3rd-generation converters.

They are not just fixed-function boxes but BASIC/C-programmable devices preloaded with our open-source serial-over-IP (SoI) application.

We welcome you to edit and change the SoI application in any way you please! It's all possible, from a simple logo change to the implementation of completely new features. Take the SoI app and make it yours!

Visit the Programmable Solutions section of our website to learn how you can modify and create Tibbo BASIC and Tibbo C applications for our products.

Serial-to-Ethernet vs. Serial-to-IP

A decade ago, our foray into the business of network-enabling serial devices has begun from offering serial-to-Ethernet (Ethernet-to-serial) products.

Later, we've added Wi-Fi and GPRS connectivity options. Hence, the terms "serial-over-IP" and "serial-to-IP" are more accurate in describing our products, as Ethernet connectivity is just one of the networking technologies we support.