Null modem cable

A null modem cable is a specialized serial cable used to connect two Data Terminal Equipment (DTE) devices directly to each other without the need for a modem. These cables are designed to cross-wire the transmit and receive lines, allowing devices that expect to talk to a modem to communicate with one another instead. They are commonly used for file transfers, debugging, and configuring networking hardware such as routers, switches, and firewalls. By facilitating direct communication between serial ports, these cables remain essential for legacy systems and industrial control applications. Users choose these cables when they need a stable, physical connection for data exchange between two serial-enabled devices. Our selection includes various lengths and connector configurations to ensure compatibility with your specific hardware requirements.

Use cases of null modem cables

Null modem cables are utilized in several technical scenarios where direct serial communication is required:

• Connecting two computers for direct file transfer or terminal emulation.
• Configuring and managing network devices like routers and switches via a console port.
• Interfacing with industrial automation equipment and programmable logic controllers (PLCs).
• Updating firmware on satellite receivers or other embedded systems.
• Establishing communication between scientific instruments and data logging computers.

Types of null modem cables

These cables are categorized based on their physical connectors and wiring schemes:

• DB9 to DB9: The most common type for modern serial ports on PCs and networking gear.
• DB25 to DB25: Often used with older legacy hardware and mainframe equipment.
• DB9 to DB25: Used as an adapter cable to connect devices with different port sizes.
• Full Handshaking vs. Partial Handshaking: Some cables include all pins for hardware flow control, while others use a simplified wiring scheme for basic data transfer.

Key features to consider

When selecting a cable, consider the following technical specifications:

• Connector Gender: Ensure you identify whether your devices require male or female connectors.
• Cable Length: Longer cables may experience signal degradation; choose the shortest length necessary for your setup.
• Shielding: High-quality shielding is important to prevent electromagnetic interference in industrial environments.
• Wiring Configuration: Verify if your specific application requires full hardware handshaking or a simple three-wire connection.

How to choose a null modem cable

To select the correct cable, first verify the serial port specifications on both devices you intend to connect. Check the connector type (DB9 or DB25) and the gender (male or female) of the ports. Consult your device manuals to determine if your hardware requires a specific wiring pinout, such as full handshaking, to function correctly. Finally, select a cable length that provides enough reach without creating excessive cable clutter, ensuring the build quality meets your environmental needs.

Which serial & parallel cables are the most popular and affordable in 2026?

The full list of popular models at affordable prices is available on this page. In 2026, the following models show high demand and an excellent price-to-quality ratio:

• Extension Cable D-Sub9/M - D-Sub9/F Digitus 3m Beige for 5.99€
• DB9 RS232 Serial Cable M/F StarTech.com MXT1002MBK for 7.99€
• Serial cable StarTech 1 m DB9 RS232 Male to Female, straight-through, black for 10.49€
• USB Cable Hama 00200624 1.5m USB A Black for 10.99€
• Digitus Datatransfer extension cable D-Sub25/M - D-Sub25/F for 12.49€

Why is it worth buying serial & parallel cables at AiO.lv?

At the AiO.lv online store, you can place an order at a great price with delivery across Latvia — to Riga, Daugavpils, Liepaja, Jurmala, Ventspils, and other cities, as well as throughout Europe. We offer products from leading manufacturers: ADAPTEC, APC, Cisco, Epson, HAMA, HP, Panasonic, Siemens, TRENDNET, WENTRONIC, Asus, DIGITUS, LOGILINK, Navilock, GEMBIRD, Unitek, ATEN, GOOBAY, DELTACO, QNAP. When you shop with us, you get:

• official warranty and guaranteed quality;
• convenient payment options (including installment and credit);
• fast and reliable delivery across Latvia and to any EU country.

FAQ

Where can you find a serial & parallel cables with cheap prices?

You can buy cheaper at the AiO.lv online store. We offer competitive prices and regular discounts, so you always have the chance to find a great deal.

What is the delivery time for serial & parallel cables?

If you place your order today, delivery will take between 1 and 5 business days depending on the chosen method.

How long is the warranty period for serial & parallel cables?

Our store provides an official manufacturer’s warranty ranging from 12 to 36 months, depending on the model and brand. If needed, you can always contact our customer service department or the manufacturer’s authorized service center for support.

Are serial & parallel cables purchasable with leasing?

Yes, if the selected product costs more than €50. You can learn more about installment purchase options and the terms of application on the Payment page.

Can serial & parallel cables be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and throughout Europe. All product prices are shown with VAT included. In certain cases, a 0% VAT rate may apply — for example, when purchasing from other EU countries with a valid VAT number. We issue an invoice immediately after the order is placed, support BIS electronic invoices, and automatically generate all required accounting documents. To complete a purchase for a company, simply select the company profile during checkout.