Virtual serial port redirector
A virtual serial port can be seen as a form of COM port redirector that operates without dedicated network software support. Creating two virtual COM ports on the same computer enables legacy serial applications to communicate directly without resorting to other methods such as communicating over named pipes.
Serial port redirection software enables the user to control data flow by emulating signal lines (DTR / DSR / CTS / RTS / DCD / RI). You can customize the pinout and replicate all serial port parameters such as Baud rate, parity and stops bits to ensure compatibility with all of your serial applications and devices.
Emulating serial ports is extremely useful when faced with a lack of physical COM ports on a computer that needs to connect to a serial device. It can also enable you to establish communication between devices or applications without the need for additional physical connections requiring cabling or hardware.
Any serial program can make use of virtual serial ports to transmit data over a TCP/IP network. A complete client-server infrastructure can be implemented using virtual COM interfaces. The data sharing capabilities and multiple connections of the virtual infrastructure let any member of your organization access legacy serial devices no matter where they are located. Virtual ports can split data streams so that many applications can access the information simultaneously.
Open source alternative - Serial port Redirector freeware
SerialToIP is a serial port redirector freeware solution that provides the ability to connect to a serial port from a network using TCP socket communication. The tool can be used with either a command-line or graphical interface. The app is a simple implementation of Terminal Server software written in C#. Any TCP/IP network can be used to send and receive data from serial ports, including those of the USB variety.
This COM port redirector is open source and is freely available to be modified to address your specifications. The open source nature of the project means that you get access to the serial port redirector code. The developers have made it point to provide working code that can be easily understood by other technicians with a knowledge of programming serial ports and sockets with C# and .NET. If you are looking for a basic and free serial port redirector, this solution is worth a look.