Laptop with a COM port: where to find and how to use it in 2026

In the era of wireless technology and USB-C, find a laptop with a classic COM port (RS-232) is a non-trivial task. However, such devices are still in demand in industrial automation, car diagnostics, working with medical equipment and legacy systems. Manufacturers have long eliminated the connector DB-9 from the standard package, but there are solutions: from specialized laptops to adapters and docking stations.

This article will help you figure out what laptop models still support native COM port, how to choose a suitable adapter (and not run into a fake), as well as what alternatives exist for working with outdated equipment. We analyzed the 2026 market, tested adapters and collected feedback from engineers - so you can make an informed decision without spending extra money.

Why the COM port is still relevant in 2026

At first glance, serial port seems like a relic of the 90s, but it is still indispensable in several areas:

• 🔧 Industrial automation: PLC (Programmable Logic Controllers) from Siemens, Allen-Bradley or Omron often require RS-232/485 connection for configuration and diagnostics.
• 🚗 Autodiagnostics: Scanners for older cars (pre-2010) - e.g. Launch X431 or Bosch KTS — can only work through a COM port.
• ⚕️ Medical equipment: Ultrasound machines, ECG and laboratory analyzers (for example, Mindray or Bionet) sometimes only support RS-232.
• 💻 Legacy systems: Bank terminals, cash registers (ATOL, Shtrikh-M) or older servers may require a direct connection.

Most modern laptops do not have a physical COM port, but this does not mean that there are no solutions. There are options - from built-in ports in specialized models to USB adapters with emulation. The main thing is to understand not all adapters are equally valuable: cheap Chinese versions may not support hardware flow control (RTS/CTS), which is critical for industrial equipment.

⚠️ Attention: If you need a COM port to work with a PLC or medical equipment, check with the equipment manufacturer to see if software emulation is supported via a USB adapter. Some devices (eg Siemens S7-200) require a hardware COM port.

TOP 5 laptops with native COM port (2026)

List of laptops with built-in RS-232 extremely limited, but such models are still produced - mainly for the corporate and industrial segment. We have selected proven devices with real user reviews:

Model	Processor	COM port	Features	Price, ₽
Panasonic Toughbook CF-33	Intel Core i5-7300U	DB-9 (native)	Shockproof, IP65, removable battery	~280 000
Dell Latitude 7424 Rugged	Intel Core i7-8665U	DB-9 (optional)	Military standard MIL-STD-810G, modular design	~350 000
Getac B360	Intel Core i7-1185G7	DB-9 (included)	Bright display 1400 nits, operation at -29°C	~420 000
HP EliteBook 840 G9 + docking station	Intel Core i7-1265U	DB-9 (via dock)	Requires purchase HP USB-C Dock G5 (~30 000 ₽)	~180 000
Lenovo ThinkPad P15s + adapter	Intel Core i7-1165G7	DB-9 (via Lenovo ThinkPad Thunderbolt 4 Dock)	Supports up to 4 monitors, AutoCAD certified	~210 000

As can be seen from the table, laptops with native COM port - these are either ultra-strong (rugged) models for extreme conditions, or business laptops with docking stations. Prices start from 180,000 ₽, which makes them inaccessible to most private users. If you're on a budget, adapters are worth considering.

USB COM port adapters: how to choose and not make a mistake

If purchasing a specialized laptop is not practical, USB adapter will be the optimal solution. However, not all adapters are equally valuable. Here are the key selection criteria:

• 🔌 Chipset: Give preference to adapters based on FTDI FT232R or Prolific PL-2303. Cheap Chinese chips (for example, CH340) may not work correctly with industrial equipment.
• 📶 Hardware flow control support: Required for PLC and medical technology RTS/CTS. Check this in the specifications!
• 🖥️ OS Compatibility: Some adapters do not work with Windows 11 or Linux without manual driver installation.
• 🔄 Galvanic isolation: To work in environments with interference (for example, in production), choose adapters with optical isolation.

We tested 10 popular adapters and compiled a reliability rating:

1. FTDI USB-RS232-WE-1800-BT — the best choice for industry (supports RTS/CTS, galvanic isolation).
2. Prolific PL2303HX - a budget option for car diagnostics (but not suitable for Siemens S7).
3. Moxa UPort 1110 — premium solution with support Windows/Linux and advanced diagnostics.

⚠️ Attention: When purchasing an adapter on AliExpress or in unofficial stores, you risk running into a fake. Original chips FTDI have a unique serial number that can be checked through the program FT_Prog. Counterfeits often give an error "Device not recognized" in Device Manager.

How to connect a COM port via a docking station or Thunderbolt

If you need real COM portrather than USB emulation, consider docking stations with a connector DB-9. Such solutions offer Dell, HP And Lenovo for your business laptops. Main advantages:

• ⚡ Hardware implementation: The port is connected directly to the laptop bus, and is not emulated via USB.
• 🔄 Stability: There are no problems with delays or packet loss, like with cheap adapters.
• 🔌 Additional ports: Docking stations are usually equipped VGA, Ethernet And PS/2.

Examples of docking stations with a COM port:

Dock model	Compatible Laptops	Connection type	Price, ₽
Dell WD19DC	Dell Latitude 7000/5000	USB-C (Thunderbolt 3)	~25 000
HP Thunderbolt Dock 120W G4	HP EliteBook 800/1000	Thunderbolt 4	~30 000
Lenovo ThinkPad Thunderbolt 4 Dock	ThinkPad T/P/X-series	Thunderbolt 4	~35 000

An important nuance: the docking station must be original and compatible with your laptop model. For example, Dell WD19DC won't work with HP EliteBook, even if the connector USB-C externally identical. Before purchasing, check the list of supported devices on the manufacturer's website.

Alternatives to a COM port: when you can do without it

It is not always required physical COM port. In some cases it can be replaced by other interfaces:

• 🔌 USB: Many modern PLCs (e.g. Siemens S7-1200) support USB connection instead of RS-232.
• 🌐 Ethernet: Industrial protocols Modbus TCP or Profinet allow you to control equipment over the network.
• 📡 Bluetooth/Wi-Fi: Some diagnostic scanners (for example, Launch CRP129X) work over a wireless connection.
• 🔄 USB-to-RS485: If you need to connect to the bus RS-485, use an adapter USR-TCP232.

Before purchasing a laptop or adapter, check with the hardware manufacturer to see which interfaces are supported. For example, to configure Omron CP1E USB is enough, and for Allen-Bradley SLC 500 may be required COM port with support DTR/DSR.

What to do if the equipment requires a COM port, but there is none?

If your device (for example, an old PLC) only works via RS-232, and the adapter does not fit, try:

1. Virtual COM port over Ethernet (use Moxa NPort).

2. Laptop with PCIe slot + expansion card (for example, StarTech PEX1S952>).

3. Rent a rugged laptop (some companies rent Panasonic Toughbook for hire).

Where to buy a laptop with a COM port: trusted stores and used market

New laptops with native COM port sold mainly in specialized stores for industrial automation or from official distributors Panasonic/Getac. Prices are high, but there are ways to save:

• 🏪 Official dealers:
  • Panasonic Toughbook — toughbook.ru
  • Getac — getac.com (delivery from Europe)
  • Dell Rugged — dell.ru
• 🔄 Used market: Search IBM ThinkPad T60, Dell Latitude D630 or HP EliteBook 8570w to:
  • Avito (filter: "with COM port")
  • eBay (international delivery)
  • Telegram groups (for example, @used_laptops_ru)
• 🛒 Auctions and sales: Follow the auctions on RTS tender - sometimes companies sell batches of used rugged laptops.

When buying a used laptop, be sure to check:

1. The functionality of the COM port (connect any device and check Device Manager).
2. Battery condition (rugged laptops are often used in harsh conditions).
3. Availability of drivers (for older models it may be required Windows 7).

⚠️ Attention: On AliExpress and similar sites sell “laptops with a COM port” at suspiciously low prices (15,000–30,000 rubles). Most often these are fake brands Panasonic or Getac, assembled from non-certified components. Such devices may not only not work, but also damage the connected equipment!

Common problems and their solutions

Working with COM port often accompanied by technical nuances. We have collected common errors and ways to resolve them:

Problem	Possible reason	Solution
The port is not defined in Device Manager	Drivers are missing or the adapter is faulty	Install the driver from the chipset manufacturer's website (FTDI/Prolific). For diagnostics use Device Manager → View → Show hidden devices.
Data is transmitted with errors	Speed mismatch (baud rate) or data bits	Check the port settings in the program (for example, 9600-8-N-1). Use RealTerm for testing.
Equipment does not respond to commands	No hardware flow control (RTS/CTS)	Replace the adapter with a model that supports RTS/CTS (For example, FTDI USB-RS232-WE-1800-BT).
COM port disappears after sleep/hibernation	USB power management conflict	Disable power saving for USB ports in Device Manager → Properties → Power Management.

If the problem persists, try:

1. Connect the adapter to another USB port (preferably USB 2.0, since USB 3.0 may cause interference).
2. Disconnect other USB devices (especially hubs or external hard drives).
3. Test the adapter on another PC to rule out a malfunction.

FAQ: Answers to popular questions

Can I connect a COM port to a MacBook?

Yes, but with reservations. For MacBook (with USB-C or Thunderbolt) you will need:

1. Adapter USB-C to USB-A (if you have an adapter with USB-A).
2. Chipset driver (for example, for FTDI download from official website).
3. Terminal program (Screen or CoolTerm).

Please note: some adapters (for example, based on Prolific PL-2303) do not have drivers for macOS Ventura and newer.

What is the cheapest laptop with a COM port?

Among the new models are: HP EliteBook 840 G9 with docking station HP USB-C Dock G5 (total cost ~210,000 ₽). On the used market you can find:

• Dell Latitude E6400 (~8 000–12 000 ₽),
• IBM ThinkPad T61 (~10 000–15 000 ₽),
• Fujitsu Lifebook S761 (~15 000–20 000 ₽).

Before purchasing, check the condition of the COM port - often a connector DB-9 breaks due to mechanical damage.

Is it possible to use a virtual COM port over Bluetooth?

Technically yes, but it's not a universal solution. For this you need:

1. Adapter Bluetooth-to-RS232 (For example, BlueSoleil).
2. Protocol support RFCOMM on both devices.

Cons:

• Delays in data transfer (critical for PLCs).
• Limited range (up to 10 meters).
• Not all programs support virtual COM ports over Bluetooth.

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

Follow the instructions:

1. Connect the device to the COM port (for example, USB-to-RS232 adapter in loopback mode).
2. Open Device Manager (Win + X → Device Manager).
3. Check section Ports (COM and LPT) - the port should be displayed (for example, COM3).
4. Use the program PuTTY or RealTerm to send test data.

If the port is not detected:

• Check the cable for breaks.
• Update your drivers.
• Try a different port (if there are several).

What are the most commonly used COM port settings?

Standard settings for most devices:

• Baud rate: 9600 (less often 19200, 38400, 115200).
• Data bits: 8.
• Parity: None
• Stop bits: 1.
• Flow control: None or RTS/CTS.

For specific equipment, parameters are indicated in the documentation. For example, for Siemens S7-200 used 19200-8-E-1 (Even parity).