In the era of wireless technology and USB-C, laptops with COM port (RS-232) have become rare, but have not completely disappeared. Their demand remains in industry, automation, auto electronics diagnostics and working with outdated equipment. The problem is that most modern laptops do not have this connector, and USB-to-COM adapters often do not provide stable communication with sensitive devices.

This article will help you figure out what laptops with COM port still being produced in 2026, where to buy them, and what to look for when choosing. We analyzed models from Dell, Panasonic, Getac and other brands specializing in industrial solutions, and also looked at alternatives for those who are not willing to overpay for a built-in port. Particular attention was paid to compatibility with software for automated process control systems, diagnostic scanners and PLC controllers.

Why is a COM port still needed in 2026?

Despite the widespread transition to USB and Ethernet, RS-232 remains critical in several areas:

  • 🏭 Industrial automation: PLC controllers (Siemens S7, Allen-Bradley), frequency converters and sensors often require a direct COM connection for configuration.
  • 🚗 Autodiagnostics: Scanners Bosch KTS, Launch X431 and old versions ELM327 work more stably through a physical port than through USB adapters.
  • 📡 Telecommunications: Setting up modems, routers and network equipment (for example, Cisco console cable).
  • 💻 Legacy equipment: Printers, cash registers and medical equipment older than 10 years may not have drivers for USB adapters.

The main problem with adapters (for example, FTDI or Prolific PL-2303) - delays in data transfer and conflicts with drivers. In industrial systems where required real response time less than 50 ms, this may lead to crashes. Therefore, laptops with a built-in COM port remain the only reliable solution.

⚠️ Attention: Not all COM ports on laptops are the same! Industrial models (eg Panasonic Toughbook) are equipped with ports with galvanic isolation and surge protection, which is critical for working with equipment in production.

Top 5 laptops with COM port in 2026

We have selected models that officially support RS-232 and are available for purchase in Russia and the CIS. Prices are as of June 2026 (may vary depending on region and configuration).

Model Processor RAM/Storage COM Port Features Price, ₽
Panasonic Toughbook CF-33 Intel Core i5-7300U 16 GB / 512 GB SSD Galvanic isolation, supports speeds up to 115200 baud ~280 000
Getac B360 Intel Core i7-1185G7 32GB/1TB SSD Dust/moisture resistant (IP65), metal housing port ~350 000
Dell Latitude 7424 Rugged Intel Core i7-1165G7 16 GB / 512 GB SSD Compatible with Dell Dock WD19 (additional COM port) ~220 000
HP EliteBook 840 G9 (with docking station) Intel Core i5-1235U 16 GB / 512 GB SSD Requires HP Thunderbolt Dock G4 (COM port optional) ~180 000
Lenovo ThinkPad P15s (modification) Intel Core i7-1260P 32GB/1TB SSD COM port via Lenovo ThinkPad Ultra Dock ~210 000

Please note: HP And Lenovo a physical COM port appears only when connected to proprietary docking stations. This is convenient for the office, but not suitable for mobile work. Panasonic And Getac offer built-in ports, but their models are classified as rugged (shockproof), which affects the price.

📊 Which laptop brand do you prefer for work?
  • Panasonic (Toughbook)
  • Dell (Latitude)
  • Getac
  • HP (EliteBook)
  • Other

How to check COM port compatibility with your hardware

Even if the laptop is equipped with a connector DB-9, this does not guarantee compatibility. Before purchasing you need to clarify:

  1. Signal levels: Industrial devices may require ±12V (RS-232 standard), while some adapters provide ±5V or 3.3V.
  2. Transfer speed: Equipment with protocol Modbus RTU often works at speed 9600 baud, but some laptops do not support non-standard values.
  3. Drivers: Make sure the port is recognized as Standard Serial over UART (checked in Device Manager).

To test, connect your laptop to the device and run Windows terminal (or PuTTY):

mode COM1:9600,N,8,1

If the port responds without errors, compatibility is confirmed. To diagnose auto scanners, use software ScanTool.net or Torque Pro (in COM emulation mode).

⚠️ Attention: Laptops with USB-C and COM adapters often do not work with equipment that requires hardware flow control (RTS/CTS). In this case, only the built-in port will help.

Specify signal voltage (12V/5V/3.3V)

Check support for the required speed (boost rate)

Test with your software (for example, Siemens TIA Portal)

Pay attention to the presence of galvanic isolation (for industrial use)

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Alternatives: Adapters and Docks

If purchasing a dedicated laptop isn't practical, consider alternative solutions. They can be divided into three categories:

  • 🔌 USB-to-COM adapters: Popular models - FTDI FT232R, Prolific PL-2303, CH340. Suitable for simple tasks, but may not cope with high-speed transmission.
  • ⚡ PCIe/ExpressCard: Expansion cards (for example, StarTech PEX1S952>) for desktop PCs or docking stations. Provide stability, but require a free slot.
  • 🖥️ Docking stations: Dell WD19, Lenovo ThinkPad Ultra Dock or HP Thunderbolt Dock add a COM port via Thunderbolt/USB-C.

Among the adapters, the best reviews are from FTDI - they support D2XX drivers that emulate a real COM port at the OS level. However, to work with Siemens Step 7 or Codesys may be required physical port — adapters often do not pass the licensed software test.

Why are adapters not suitable for PLC programming?

Many industrial programs (for example, Siemens TIA Portal or Allen-Bradley RSLogix) check the “hardware” port identifier. USB adapters pretend to be virtual devices, resulting in errors like "No communication driver found" or "Interface not supported". In some cases, manually editing the Windows registry helps, but this does not guarantee stability.

Where to buy a laptop with a COM port in 2026

Specialized models are not sold in every store. Here are the tested options:

  • 🌍 Official distributors:
    • Panasonic Toughbook — panasonic.com/ru (via the feedback form).
    • Getac — getac.ru (there is a representative office in Moscow).
  • 🛒 Specialized stores:
    • RugGear — industrial laptops and tablets.
    • 4GLTE — equipment for automated process control systems and telemetry.
  • 📦 Foreign sites:
    • eBay (filter by "Industrial Laptop with COM port").
    • Alibaba (wholesale quantities, for example, Durabook S15I).

When purchasing used models (for example, Panasonic CF-19 or Dell Latitude E6400) check the condition of the port - oxidation of contacts can lead to loss of communication. Also check if your OS is supported: some older laptops do not have drivers for Windows 11.

💡

If you need a laptop to work with KLine adapters (for example, for diagnostics VAG-Group), look for models that support L-port (9-pin, but with a different pinout). These are found in Dell Latitude series E6x20.

Setting up a COM port in Windows 10/11

Even with a physical port, problems can arise if the drivers are installed incorrectly or conflict with the software. Follow this algorithm:

  1. Open Device Manager (devmgmt.msc) and find the section Ports (COM and LPT).
  2. If the port appears as Unknown device, update the driver manually (download from the laptop manufacturer’s website).
  3. For industrial applications, disable Power management port: 
    Панель управления → Диспетчер устройств → Порты → Свойства порта → Управление электропитанием → Снять галочку с "Разрешить отключение..."
  4. If you are using an adapter, install FTDI or Prolific drivers corresponding version (new drivers may not support older chips).

To test the connection use Termite or RealTerm. If data is not being transferred, check:

  • Matching speed (boost rate) on both devices.
  • Correct connection TX→RX And RX→TX (mixed wires are a common mistake).
  • Availability of grounding (sometimes it is necessary to connect GND).
⚠️ Attention: In Windows 11 some industrial programs (for example, Siemens Simatic Manager) may not see the COM port due to driver security policies. The solution is to disable Driver Signature Enforcement in diagnostic mode (key F7 when loading).
💡

For stable work with PLC controllers, use laptops with processors Intel (series Core i5/i7 or Xeon) - they are better optimized for working with industrial software than AMD Ryzen.

The future of COM ports: what to expect in 2026–2026

The trend is that manufacturers are gradually abandoning built-in COM ports even in industrial laptops. However, there are several factors that can extend their life:

  • 🔄 Backward Compatibility: Companies like Siemens And Rockwell Automation continue to support RS-232 in new equipment (for example, S7-1200 also equipped with a port).
  • 🛡️ Security: Isolated COM connections are less vulnerable to cyber attacks than USB or Ethernet, which is important for critical infrastructure.
  • 🔌 Hybrid solutions: The emergence of docking stations with USB4/Thunderbolt 4, which emulate a COM port in hardware (for example, Dell WD22TB4).

Popularity is expected to grow in the next 2–3 years USB-C with Alternate Modes, which can emulate RS-232 without delays. However, for legacy equipment (manufactured before 2010), a physical port will remain the only reliable option.

If you are planning to buy a laptop with a COM port for growth, pay attention to models with modular architecture (For example, Framework Laptop), where a port can be added via an expansion slot. So far there are few such solutions, but the trend towards customization is gaining momentum.

FAQ: Frequently asked questions about laptops with a COM port

Is it possible to add a COM port to a regular laptop via USB?

Technically yes, but for industrial equipment this often doesn't work. Adapters on chips FTDI or Prolific suitable for simple tasks (for example, setting up a router), but do not guarantee stability when working with PLCs, scanners or medical equipment. Problems arise due to:

  • Delays in data transmission (latency >50 ms).
  • Lack of hardware flow control (RTS/CTS).
  • Conflicts with drivers (especially in Windows 11).

For critical tasks, it is better to use a laptop with a built-in port or a PCIe expansion card (for desktop PCs).

What is the cheapest laptop with a COM port?

Among the new models, the most budget option is Dell Latitude 5420 Rugged (from ~150,000 ₽) or HP EliteBook 840 G9 with docking station (from ~180,000 ₽). On the secondary market you can find:

  • Panasonic CF-19 (2010–2015) — ~30,000–50,000 RUR (check the condition of the battery and port!).
  • Dell Latitude E6400/E6500 — ~20,000–40,000 ₽ (supports Windows 10, but not Windows 11).

When buying a used one, check whether the laptop has been repaired - often the COM port fails due to mechanical damage to the connector.

Can I use a MacBook with a COM port?

No, not a single model MacBook (including MacBook Pro with Apple Silicon) is not equipped with a built-in COM port. Alternatives:

  • Adapters USB-C to RS-232 (For example, Tripp Lite USA-19HS), but they do not work with all software.
  • Virtual machines with Windows + port emulation (not suitable for real time).
  • Remote connection to a PC with a COM port via TeamViewer or AnyDesk.

For professional work with industrial equipment MacBook doesn't fit.

What is the maximum cable length for the COM port?

Standard RS-232 limits cable length to 15 meters at speed 9600 baud. At higher speeds (eg. 115200 baud) maximum length is reduced to 3–5 meters. To extend the connection use:

  • Signal repeaters (For example, B&B Electronics 232RPT).
  • Converters to RS-485 (allow you to increase the distance to 1200 meters).
  • Fiber optic converters (for industrial environments with interference).

Important: If the recommended length is exceeded, the noise level increases, which leads to transmission errors (Parity Error, Framing Error).

How to check if the COM port on a laptop is working?

To diagnose, follow these steps:

  1. Connect the loop (loopback): connect the contacts 2 (RX) And 3 (TX) on the DB-9 connector.
  2. Open PuTTY or Windows terminal and submit test data.
  3. If the characters are displayed in echo mode, the port is working.

To check in Windows use the command:

echo AT > COM1:

If the port responds OK - connection established. For in-depth diagnostics, use PortMon (utility from Microsoft).