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USB to Serial Adapters (RS232)

A USB to Serial adapter is an easy way to add one or more RS232 serial ports to a computer. On this page you will find our RS232 versions with one, two or four serial ports in one converter, which means that you can add up to four serial RS232 ports to one computer.

The installation process is relatively easy. First you download the drivers for the USB to serial adapter from our website. Then unzip the downloaded file and install the drivers on your computer by clicking on the installation file. Once the installation is complete you can connect the USB to serial adapter to your computer and the operating system (Windows or Mac) will create a virtual COM port which will show up in Device Manager.

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Product Image Item Name- Price
USB to Serial Adapter - Economy Mini - DISCONTINUED

USB to Serial Adapter - Economy Mini - DISCONTINUED

** This product has been discontinued and replaced by XS882 ** This low-cost mini USB to Serial adapter is ideal for mobile applications and devices. It is utilizing the low-cost PL2303 chip from Prolific which makes it easy to add a serial port to...
$9.95
... more info
Sold Out
USB to Serial Adapter - PRO Mini

USB to Serial Adapter - PRO Mini

This PRO version mini USB to Serial adapter is similar to our STD mini adapter however with some major exceptions: this adapter is designed around the popular and highly reliable FT232RL chip from FTDI which makes this adapter superior to the...
$24.50
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USB to Serial Adapter - Professional

USB to Serial Adapter - Professional

So you are looking for a good low-cost USB Serial adapter (RS232) and you are asking yourself " Will a $10 USB Serial adapter cable work with my device? and will it work with Windows 10 and 11?! " Well read on and find out why you have to be careful...
$38.95
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USB Serial Adapter - Ultimate

USB Serial Adapter - Ultimate

This is our high quality USB to Serial adapter . It is one of the most reliable, high performance and easy to use USB serial adapters on the market. It is optimized for Windows 11, Windows 10, Windows 8 and Windows 7 32 and 64-bit versions but will...
$38.95
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USB to Serial Adapter - Thunderlinx™

USB to Serial Adapter - Thunderlinx™

If you don't mind paying a bit extra to get the absolute best and highest quality then the Thunderlinx™ USB to Serial adapter is for you. As all other USB serial adapters the Thunderlinx™ adapter converts serial data to USB data and vice...
$65.00
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USB-C to Serial Adapter, RS232

USB-C to Serial Adapter, RS232

Many new computers now has the USB Type-C connector for connecting USB devices. This USB-C to Serial RS232 adapter will work with all USB Type C ports and most types of serial RS232 devices. This adapter is designed around the high quality FT232RL...
$29.50
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USB Serial Adapter, 2-ports

USB Serial Adapter, 2-ports

Here is a USB to dual RS232 serial port adapter cable which is similar to our Y-106 adapter with the difference that it has the better FTDI FT232RL chipset which is more reliable and has better performance. The FT232RL chipset is a good all-round...
$39.99
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USB to Serial RS232 Adapter - Fully Isolated

USB to Serial RS232 Adapter - Fully Isolated

This USB to serial RS232 converter has one RS232 port which is fully isolated from the USB port. It us built around the FT232RL processor chip which is one of the best serial conversion chips on the market. Isolation is made using the ADM3251E chip...
$49.00
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USB to Serial Adapter, 2-ports, Industrial

USB to Serial Adapter, 2-ports, Industrial

Here is a 2-port USB to RS232 converter which can be used as a desktop converter but it also has brackets included for wall and DIN installation. The enclosure is made of metal and it has 15KV ESD protection against static electricity and voltage...
$59.00
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USB Serial Adapter, 4-ports

USB Serial Adapter, 4-ports

Desktop-style commercial strength 4-port USB-RS232 converter optimized for Windows 10, Windows 8 and Windows 7 but will also work fine with Linux, Mac and older operating systems. With this multi-port USB-RS232 converter you can easily add four...
$69.95
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USB to Serial Adapter, 4-ports, Industrial

USB to Serial Adapter, 4-ports, Industrial

Here is a 4-port USB to RS232 converter which can be used as a desktop converter but it also has brackets included for wall and DIN installation. The enclosure is made of metal and it has 15KV ESD protection against static electricity and voltage...
$79.00
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USB to 3-Port RS232/485/422, Isolated

USB to 3-Port RS232/485/422, Isolated

The MWE820B is an industrial strength very solid and reliable isolated USB to Serial Converter with RS232 / RS422 / RS485 interfaces that requires no external power supply. With its standard DIN rail mount and screw terminals it is a great choice...
$79.95
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The USB to Serial Adapter - Generally

A USB to serial adapter, also referred to as a USB serial converter or RS232 adapter is a small electronic device which can convert a USB signal to serial RS232 data signals. RS232 is the type of signal which is in many older PCs and is referred to as a serial COM port.

A USB to serial adapter typically converts between USB and either RS232, RS485, RS422 or TCP signals, however some USB to serial adapters have other special conversion features such as custom baud rates, high-speed or other.

Even the USB to serial adapter RS232 standard is an older communication protocol it is still used by many modern serial RS232 devices in both business and consumer markets and is also often used for personal and office serial devices.
More recently most new computers do not have a built-in COM port so a USB serial adapter is often used for connecting many types of serial devices to a computer. A standard USB to serial adapter is a very useful device for connecting equipment such as printers, scanners, scales and GPS devices, but also most business and consumer equipment can be connected to a computer by using an industrial grade adapter.

The USB serial adapter is made in different versions and grades, the 1-port adapter is very popular and one of the most commonly used adapters. Two to four port adapters are also frequently used if the user needs more than one serial port. Multi-port adapters can be connected to a computer by using just one USB cable, where after the computers operating system will create multiple virtual COM ports. Grades range from standard consumer grade to industrial grade and even mission critical grade adapters.
Most consumer grade USB serial adapters are not optically isolated or protected against high voltage spikes however most industrial grade adapters are optically isolated which means they are protected against voltage spikes and surges, ground-loops and most other voltages which potentially can damage the adapter or the connected serial devices.

The serial RS232 protocol has existed since the early 60'ties so you may wonder why it is still being used today. The reason is that it is a very reliable way of data communication and it is fairly easy to understand for engineers so it's easy to develop and program new devices. Another reason is that since the serial protocol has existed for such a long time, many devices already have the serial protocol built-in so its easy to integrate new devices with old devices.

How to install and use a USB to Serial adapter (RS232)

If you have a device with a serial port and you need to connect it to a computer, then you can use a USB to Serial adapter, since most modern computers doesn't have a native serial port. Only computers in the old days had a serial COM port. Fortunately modern computers has USB ports which can be used for converting serial data from USB to serial RS232 and also from serial to USB, almost all converters will convert data in both directions.

Installing the drivers

The first thing you need to do when connecting a USB to serial RS232 adapter to your computer is to install the drivers for the adapter. Drivers are a small collection of files which will be installed on your computer. These files will tell the operating system how to use/communicate with the USB to serial adapter's hardware and how to convert the data.
The drivers can be downloaded for free from our website here:

Drivers for the USB to Serial adapter

The download consists of a zip file. To install the drivers simply unzip the downloaded file and navigate to the folder with the operating system you are using, then run the exe file with the driver installation program.

USB to Serial adapter driver installation

Once the drivers are installed successfully you can connect the USB end of the USB to Serial adapter (RS232) to your computer's USB port and the adapter is ready to use.

Accessing and using the virtual COM port

To be able to access and use the virtual serial COM port created by the drivers and Windows, you need to find out which COM port number has been assigned by Windows.
With the USB to Serial adapter connected to your computer you open Windows Device Manager and click on the "Ports (COM & LPT) tab. Under this tab the all COM ports in your computer will be listed. In the example below, COM port 25 is the virtual serial COM port for the USB to Serial adapter. The two other COM ports are native COM ports in this example.

virtual serial com port

If you right-click on the virtual RS232 COM port and click on Properties, you will be able to see the serial port's settings, and under Advanced you will be able to change the COM port number assigned to the USB to serial adapter. The COM port number can be any number between 1 and 255, as long as it's not already in use by the system.

serial rs232 com port properties

Types and uses

As mentioned earlier, there are several types of USB to Serial adapters. Here are the overall categories / types:

  • USB to Serial RS232 adapter
  • USB to Serial RS485 adapter
  • USB to Serial RS422 adapter
  • Multi-port USB to Serial adapters
  • Isolated USB to Serial adapters
  • Industrial grade USB to Serial adapters

Obviously, a USB to Serial RS232 adapter is used for communicating with a RS232 serial device and a USB to RS485 / 422 adapter is used for communicating with a RS485 or RS422 device respectively. Adapters that combine all three interfaces into one adapter is also available, so you don't need three individual adapters if you have three different types of devices.

Multi-port adapters are USB to serial adapters which has more than one COM port. It can be for example two, four, six, eight, sixteen or even thirty-two COM ports in one adapter. The ports can be either the same type (RS232) or a combination of RS232, RS485 and RS422 ports.

Isolated USB to Serial adapters are designed not only to convert data but also to isolate the connected devices from each other. For example, if you want to isolate your computer from the connected serial device for safety reasons. Isolation makes sure that if there are voltage spikes, surges, ground-loops or other voltages that can damage either the computer or the device, then they are isolated from each other, which will protect at least one of the devices.

   

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