Null-modem emulator vs Virtual Serial Ports Emulator

A null-modem emulator is a software program that emulates a null-modem cable connection between two serial ports on the same computer. This allows applications that expect a direct serial connection to communicate with each other locally.

Virtual Serial Ports Emulator is a software that creates virtual COM ports to emulate real serial ports. It allows connecting applications that require serial ports to virtual ports rather than physical ones.