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Overview Virtual Serial Port Kit creates a pair of virtual serial ports connected with virtual null-modem cable. The software provides null-modem connection between two serial communications applications. Communications software interacts with each other via virtual COM ports in the same way as via hardware COM ports connected with real null-modem cables. All the data written to one virtual COM port can be immediately read from another one and vice versa. How it works Once created, virtual serial ports appear in the list of COM port devices on your computer and function as hardware serial ports. As soon as any serial application opens the first virtual COM port and the other application opens the second virtual COM port, the connection between two serial applications is established. Now serial data can be transmitted over virtual COM port connection. Full hardware serial ports emulation Virtual COM ports fully emulate behaviour of hardware COM ports, so any serial communications application works with virtual COM port as if it were a hardware COM port. Runs as system service The program makes virtual serial ports accessible at every system startup even prior to user's logon. Once configured, virtual COM ports are created automatically and you don't have to adjust anything or even login to operating system. Custom pinouts There are several common pinout schemes of null-modem cables used for the communication process. Virtual Serial Port Kit supports different null-modem pinouts with different handshakes allowing also to customize them. Loopback plug emulation A loopback plug is a device used to test serial communications applications. As data is looped, the application recognizes output data as input data. Using Virtual Serial Port Kit it is possible to emulate loopback plug just in few clicks. Usage Example There are serial application A and serial application B on the computer. You need to establish bidirectional connection and da