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2. Virtual COM port - Wikipedia

   en.wikipedia.org/wiki/Virtual_COM_port

   A software-based virtual serial port presents one or more virtual serial port identifiers on a PC which other applications can see and interact with as if they were real hardware ports, but the data sent and received to these virtual devices is handled by software that manipulates the transmitted and received data to grant greater functionality.

3. USB-to-serial adapter - Wikipedia

   en.wikipedia.org/wiki/USB-to-serial_adapter

   When the USB to serial adapter is connected to the computer via the USB-port the driver on the computer creates a virtual COM port which shows up in Device Manager on Windows, and under /dev on Linux and MacOS. This virtual COM port can be accessed and used as if it was a built-in serial COM-port.

4. BNU (software) - Wikipedia

   en.wikipedia.org/wiki/BNU_(software)

   Having serial port support as provided by BNU and other similar drivers allowed the communications software programmers to spend more time on the actual applications instead of the depths and details of how to talk to the serial ports and the modems connected to them. Sending communications data across a modem link was a lot more involved than ...

5. SIO (software) - Wikipedia

   en.wikipedia.org/wiki/SIO_(software)

   SIO is a serial port driver package for OS/2 written by Raymond L. Gwinn. It is designed to not only improve performance over OS/2's default serial drivers, but also improve compatibility. SIO contains a virtualized FOSSIL (VX00) driver that can be loaded to provide FOSSIL support to DOS based communications software.

6. Device driver - Wikipedia

   en.wikipedia.org/wiki/Device_driver

   Virtual devices may also operate in a non-virtualized environment. For example, a virtual network adapter is used with a virtual private network, while a virtual disk device is used with iSCSI. A good example for virtual device drivers can be Daemon Tools. There are several variants of virtual device drivers, such as VxDs, VLMs, and VDDs.

7. Device file - Wikipedia

   en.wikipedia.org/wiki/Device_file

   ttyS: (platform) serial port driver ttyUSB : USB serial converters, modems, etc. The canonical list of the prefixes used in Linux can be found in the Linux Device List , the official registry of allocated device numbers and /dev directory nodes for the Linux operating system.

8. Null modem - Wikipedia

   en.wikipedia.org/wiki/Null_modem

   A virtual null modem is a communication method to connect two computer applications directly using a virtual serial port. Unlike a null modem cable, a virtual null modem is a software solution which emulates a hardware null modem within the computer. [6] [7] All features of a hardware null modem are available in a virtual null modem as well ...

9. Data Carrier Detect - Wikipedia

   en.wikipedia.org/wiki/Data_Carrier_Detect

   Frequent use of a serial port is for a direct computer-to-computer connection. This requires an adapter called a null modem, which isn't actually a modem in the traditional sense, but rather a connector plug that simply crosses the complementary pins on two serial ports so the two sides can communicate. A null modem typically connects the DTR ...