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). Yes, a RS232 to USB converter does have a full-blown UART circuit built-in. As any standard UART, it does have Rx, Tx, and flow control pins. As any UART, it must be properly configured to be able to communicate with the "partner" at the other end of UART link. 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. However in 95% of cases, it will fail to automatically install the drivers. So you have to install drivers manually. 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.

Introduced in 1975, the RS-422 standard was intended as a replacement for RS-232C. It used lower voltages and differential signaling to support faster data transmission, longer cable lengths and reduced RF/EMI noise. It specified the same DB25 connector as the original RS-232 standard. RS-232 is a simple serial communication standard in which one bit of data is transmitted at a time over a serial cable at the relatively slow rate of up to 20K bits/second and distances up to 50-ft. By specifying the voltage, signaling, pin wiring and control data between a host device and a peripheral, the RS-232 standard ensured that devices from different manufacturers could communicate with each other.COM port is another name for a serial port on a computer. Computers no longer have COM port but the driver for a serial to USB adapter may create a virtual COM port so a legacy serial device can connect to the computer. 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. Some devices will only connect to your computer using a port called "RS232 Serial Port". This port was used on old computers before 2003. When you plug a USB to Serial Adapter like the USA-19HS into a Windows 10 machine, it should appear in the Device Manager under Ports (COM & LPT). If you do not see this heading, go to the View menu and make sure Show Hidden Devices is selected. If you still do not see your adapter, you will need to install the manufacturer's driver for your device. 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.

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.Serial cables can also be used to connect two DTEs together but the pins must be wired so transmitter pins are connected to receiver pins. Cables that use this "crossover" wiring are known as null modem cables.

Parallel cables are much faster than serial cables but they are bulkier, more expensive and prone to signaling errors like crosstalk, especially over longer distances.

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Connect RS232 device into any USB port. This time Windows will auto-install the drivers. You can verify a correct install going to Device Manager. Here's how... Windows Vista/7/8/10: Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 2012 R2, Windows 2016, Windows 2008 R2

Verify RS232 device is connected to COM PORT number between 1 to 4. This is a MUST, else it will not work.

Please note:

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. Supports Windows 2000, Windows XP, Windows Vista 32/64-bit, Windows 7, Windows 10 and Mac OS 10.12.1. If install STILL failed to install the drivers or above "Prolific..." device has a yellow triangle next to it, then: Install the driver file from the disc that came with the RS232 Device. Since the original RS-232 standard was published in 1962, it has been revised a number of times. Each revision is given a letter suffix. The current version, TIA/EIA-232-F, was published in 1997.