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How to add a com port on laptop or PC?

Olga Weis Olga Weis

If you want to know how to connect RS232 to a PC that does not have any port or needs more for a specific purpose, there are six ways to do that.

  1. Simulate COM ports with a software application
  2. Convert USB to COM port
  3. Convert Ethernet to COM
  4. Adding COM ports over WiFi
  5. Conversion or branching of RS-232, RS-422, RS-485
  6. Adding COM ports via PCI, PCIe, ISA buses

1. Simulate COM ports with a software application

The most effective and efficient method of adding a COM port in computers is through the use of special software. Creating virtual serial ports is a more flexible solution and eliminates the need for additional hardware or cabling.

Virtual Serial Port Driver (VSPD) from Electronic Team is an excellent choice when you need to know how to add COM interfaces to a Windows computer. It fully supports Windows 10 and 11 as well as previous versions of the OS.

How to add a serial port on laptop or PC

  1. To download the Virtual Serial Port Driver from its official site, Click here. Next, install the driver on your computer.
  2. Run the software and then navigate to the tab "Pair".
  3. You must find the option "Add a new pair" and click on it. From the drop-down menu, choose names for new virtual COM ports. Alternatively, you can assign names by manually typing custom names that you prefer.
  4. Locate the button "Create" and click on it. Now, you will find two newly created serial ports in the Device Manager of your computer.

Download VSPD to add an unlimited number of COM ports

Here are some of the Standard version’s outstanding features:

  • Provides the ability to create an unlimited number of virtual serial port pairs;
  • Fully emulates the settings of physical COM ports;
  • High-speed data transfer through the virtual ports;
  • Virtual null-modem schemes;
  • Automatic re-creation of virtual ports on reboot;
  • Windows kernel driver technology support.

The Pro version offers extended capabilities including:

  • Splitting and merging physical or virtual serial ports;
  • Setting individual read and write permissions for each port;
  • Sharing a physical serial interface with multiple applications simultaneously.

VSPD is a reliable and convenient solution to the problem of adding serial ports to your Windows computer. There is no extra equipment involved and it does not require you to use another of your system’s hardware interfaces.

2. Convert USB to COM port:

If your system has a free USB port, you can use it to convert between USB and serial signals.

The USB to serial adapter is a small piece of equipment that has a USB connector at one end and at least one, and perhaps multiple, serial connectors on the other end.

USB to Serial adapter

Belkin USB to COM port converter

There are 3 simple steps to launch USB to serial adapter:

  1. Download and install the driver for your particular converter.
  2. Plug the converter into the computer’s USB port.
  3. Attach a serial device to the converter.

Now you can interact with the serial port on laptops despite not having a physical COM port on the device. This method requires that your computer or laptop has a free USB port.

3. Convert Ethernet to COM:

You can obtain an Ethernet to COM converter, also called a device server, that enables you to convert serial signals. The signals are sent over the network and your computer interacts with the devices through a virtual COM port.

Ethernet to serial device server

Ethernet to Serial device server with 4 RS-232/422/485

How to convert Ethernet port to COM port?

Using an Ethernet to COM converter entails these steps:

  1. Attach the serial device to the device server.
  2. Connect the device server to the Ethernet.
  3. Use your computer to communicate with the serial device through Ethernet.

4. Adding COM ports over WiFi

Taking advantage of your computer’s WiFi capabilities is another way to add a COM port to your system. The concept is similar to the Ethernet converter except it uses your wireless network. Serial WiFi adapter allows you to connect RS232 to PC to secure or open a wireless network or access point.

Serial to WiFi Adapter

Serial WiFi Adapter - RS232

Implementation involves:

  1. Connecting a serial device to the wireless device server;
  2. Broadcasting the signal on the WiFi network;
  3. Accessing the serial device on the WiFi network using your computer.

5. Conversion or branching of RS-232, RS-422, RS-485 interfaces

Perhaps you have an open COM port on your computer but need multiple interfaces for a specific purpose. You may also have a port that does not support the communication protocol of the device you intend to use. Both of these issues can be solved with the addition of some hardware and cables.

In the case of requiring more COM ports when you have one open on your machine, a Serial Port Hub is the solution. The hub will have one connector that attaches to the free serial port on your computer and several COM ports available to be used by devices. The devices essentially share your computer’s single port.

Serial port hubs - RS232 Serial Splitter

DTECH Industrial 8 Port RS232 Serial Splitter Switch

Converting between serial protocols such as RS232 to RS485 is also possible with a hardware converter. One end plugs into your machine’s COM port and the other connects to the serial device.

6. Adding COM ports via PCI, PCIe, ISA buses

If you want to understand how to add RS232 to a laptop using ISA, PCI, or PCIe buses, read on.

If your computer has expansion slots, they can be used to provide serial ports to the machine. Multiport serial card installs in slots in a PC on the ISA or PCI buses.

Many different serial expansion serial boards are available which provide multiple COM ports. They can support any of the serial communication protocols, and add functionality to your computer. Quite often, you may encounter a problem with a lack of free space for serial port connectors on the external-facing part of the card. To solve this problem, you just need to have a cable with connectors on both ends.

Serial port hubs - RS232 Serial Splitter

4 Port RS232 PCI Express Serial Card w/ Breakout Cable

Make sure that the card you obtain is for the type of expansion slot in which you plan to employ it.

To use one, follow these steps:

  1. Locate a free expansion slot on your computer.
  2. Open up the slot.
  3. Insert the card making sure it is properly connected to the computer.
  4. Install the card’s driver if necessary.
  5. Plug your serial devices into your newly obtained COM ports.

With the above explanation, you must have understood how to connect RS232 to a PC. There are many ways to do that. Also, many of them require you to use additional hardware and cables. You may also be faced with the prospect of swapping devices in and out of your converters.

The more elegant solution is to use Virtual Serial Port Driver to create as many virtual serial ports as you need. It is a versatile serial communication application that enables any computer to interact with serial devices.

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