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2. USB-to-serial adapter - Wikipedia

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

   A USB-to-serial adapter or simply USB adapter is a type of protocol converter that is used for converting USB data signals to and from serial communications standards (serial ports). Most commonly the USB data signals are converted to either RS-232 , RS-485 , RS-422 , or TTL-level UART serial data.

3. USB communications device class - Wikipedia

   en.wikipedia.org/wiki/USB_communications_device...

   With a vendor-supplied INF file, Windows Vista works with USB CDC and USB WMCDC devices. [1] This class can be used for industrial equipment such as CNC machinery to allow upgrading from older RS-232 serial controllers and robotics, since they can keep software compatibility. The device attaches to an RS-232 communications line and the ...

4. RS-485 - Wikipedia

   en.wikipedia.org/wiki/RS-485

   RS-485, also known as TIA-485(-A) or EIA-485, is a standard, originally introduced in 1983, defining the electrical characteristics of drivers and receivers for use in serial communications systems. Electrical signaling is balanced, and multipoint systems are supported.

5. StarTech.com - Wikipedia

   en.wikipedia.org/wiki/StarTech.com

   StarTech.com's product range includes adapters, converters, connectors, extenders, splitters, and switches. The company's products are divided into 8 main categories: Audio/Video Products, Electrical Cables, Server Management, Hard Drive Accessories, Expansion Cards, Networking Products, Computer Parts, and Laptop/Notebook Docking Stations ...

6. RS-232 - Wikipedia

   en.wikipedia.org/wiki/RS-232

   Many RS-232 driver chips have inbuilt charge pump circuitry to produce the required voltages from a 3 or 5 volt supply. RS-232 drivers and receivers must be able to withstand indefinite short circuits to the ground or to any voltage level up to ±25 volts. The slew rate, or how fast the signal changes between levels, is also controlled.

7. Virtual COM port - Wikipedia

   en.wikipedia.org/wiki/Virtual_COM_port

   The drivers for a software-implemented modem create a virtual serial port for communication with the host operating system, since the modem is implemented entirely in the device driver and therefore there is no point where the serial data would be sent to the physical card.