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To do so, the UART circuit is "bridged" to USB interface. The USB interface has the CDC class descriptor (Communication Device Class), and the USB host driver maps this USB device into a virtual COMnn port with nearest available number, so PC applications can use it as an usual COM port. Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 2012 R2, Windows 2016, Windows 2008 R2 RS-232 (originally called Recommended Standard 232 but shortened to RS232) was developed by the Electronic Industry Association (EIA) in the 1960s for the exchange of data between DTE (Data Terminal Equipment) and DCE (Data Communication Equipment). It was later adopted by the personal computer industry so PCs could connect to modems, peripherals and data acquisition devices such as lab test equipment, GPS receivers and point of sale terminals. The USB cable (Universal Serial Bus) is the easy-to-use, standardised connector that allows for the integration of different types of devices with a computer. A USB cable consists of four wires that are used for transferring separately power and data. A USB cable allows for communication between devices in both directions. However in 95% of cases, it will fail to automatically install the drivers. So you have to install drivers manually.
Some devices will only connect to your computer using a port called "RS232 Serial Port". This port was used on old computers before 2003.Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 2012 R2, Windows 2008 R2 Serial ports rely on a microcontroller chip called a Universal Asynchronous Receiver Transmitter (UART) to "serialize" the data coming from the host computer's bus so it can be transmitted through the serial port. Serializing means transforming bytes of data into a sequence of bits with start and stop bits on either end. On the receiving end, another UART chip reconverts the serialized data into "parallel" bytes. Most UART chips cache data coming in from the computer bus so they can transmit faster than the normal 115 Kbps transmission rate of a standard serial port. The RS-485 standard was published in 1983 and is substantially similar to the earlier RS-422 standard. The big difference is support for multiple transmitters and receivers, allowing devices connected on an RS-485 network to "talk amongst themselves" in half-duplex mode over inexpensive twisted pair cabling. RS-485 describes the electrical characteristics of the drivers and receivers but does not specify a communication protocol. Serial to USB adapters are typically compliant with the USB 2.0 specification, with a data rate of 12 Mbps and support USB features such as suspend (device sleeps), resume (device wakes) and remote wake-up (device wakes host). You just easily hook the cable into PC or Hub’s port, and it can connect any RS-232 devices, such as PDA, scanner, printer etc. Bear in mind that some devices may need an additional software for proper operation.
Verify RS232 device is connected to COM PORT number between 1 to 4. This is a MUST, else it will not work. Standard RS232 cables connect a DTE (Data Terminal Equipment) such as a desktop computer to a DCE (Data Communications Equipment), typically a modem, printer or special-purpose peripheral. These "straight through" serial cables connect pins on the sending device to the same pins on the receiving device (e.g. pin 1 to pin 1, pin 2 to pin 2 and so on). Supports Windows 2000, Windows XP, Windows Vista 32/64-bit, Windows 7, Windows 10 and Mac OS 10.12.1. Windows XP, Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 2012 R2, Windows 2016, Windows 2008 R2
RS-422 was used with a smaller 8-pin mini-DIN connector on early Apple Macintosh computers to connect to AppleTalk networks and various peripherals. RS-422 is also found on professional video broadcasting equipment.
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