This implementation requires two computers or a single machine with two physical COM interfaces. Typically this is done with a physical null-modem which is a cable that directly connects the serial ports. Two programs that communicate with serial ports need to use a null-modem connection. What problem can be solved with a Virtual Null Modem? The application allows you to create as many virtual ports as you want, limited only by your system resources. It also enables you to create custom-named virtual serial ports that you can connect with a virtual null-modem cable. A null-modem connection enables two computers to transfer data directly without using a network or removable storage media.Ī Virtual Null Modem is a software tool which can emulate RS232 COM ports that are connected with a virtual null-modem cable. A null-modem cable is used to allow two data terminal equipment (DTE) devices such as computers to communicate through RS232 interfaces without requiring a modem or other type of data circuit-terminating equipment (DCE).

Mac sierra create serial port emulator