DB9 to DB25 Serial Adapter M/F StarTech AT925MF

The StarTech DB9 to DB25 Serial Adapter (AT925MF) converts a 9-pin DB9 connection into a 25-pin DB25 male connector, enabling communication between devices with DB9 connectors and equipment that uses DB25 serial ports. The adapter has a durable beige housing and is intended for use with legacy serial systems where a simple, passive interface is required. It is backed by StarTech.com's lifetime warranty for long-term reliability.

Advantages

This DB9 to DB25 serial adapter provides a compact, passive solution for connecting DB9 devices to DB25 ports without requiring drivers or power. Its sturdy construction and standard pin mapping ensure consistent data transmission for serial communications. The adapter's plug-and-play design makes installation straightforward and it is compatible with a wide range of legacy serial devices.

Suitable for

• Connecting DB9-equipped peripherals (modems, serial mice, industrial equipment) to DB25 ports
• Integrating legacy hardware into systems that provide only DB25 serial connectors
• Field service and maintenance tasks requiring quick serial port adaptation

Key specifications

• Model: AT925MF
• Brand: StarTech
• Connector configuration: DB9 (female) to DB25 (male)
• Compatibility: Standard RS-232 serial pinouts for legacy devices
• Color: Beige
• Warranty: Lifetime Warranty (StarTech)
• EAN: 065030200943

How to use

Align the DB9 connector on the adapter with the DB9 port of your device and plug it in securely. Then connect the DB25 male end to the DB25 serial port on the host equipment. Tighten any retention screws if present to ensure a stable physical connection. No additional drivers or power source are required; the adapter functions as a passive pin-mapping connector for RS-232 serial signals.

Usage recommendations

Use the adapter in environments where distance and cable quality are suitable for RS-232 signals; for long cable runs or electrically noisy environments consider using shielded serial cables or signal extenders. Verify device pinouts when connecting non-standard or purpose-built equipment to avoid miswired connections.