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.

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. 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. 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. Some devices will only connect to your computer using a port called "RS232 Serial Port". This port was used on old computers before 2003.However in 95% of cases, it will fail to automatically install the drivers. So you have to install drivers manually.

A USB to serial adapter that uses the FTDI chipset. The chipset manufacturer, Future Technology Devices International (FTDI), is a Scottish semiconductor company specializing in USB interfaces. 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. 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.

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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. Supports Windows 2000, Windows XP, Windows Vista 32/64-bit, Windows 7, Windows 10 and Mac OS 10.12.1. 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.