DB9 RS232 Serial Null Modem Cable 2 m — StarTech, F/F, Black

The StarTech DB9 RS232 Serial Null Modem Cable 2 m is a female-to-female DB9 cable for direct serial communication between RS232 devices. With a 2 metre length and two DB9 female connectors, this cable enables direct data transfer and device configuration without the need for a modem. It is designed for applications where reliable serial connections are required, including PC-to-PC file transfer, connecting routers, industrial controllers and legacy peripherals. The cable is finished in black and supplied as a single, lightweight unit that is easy to route and store.

Advantages

This null modem cable uses DB9 female connectors on both ends to simplify connections between serial devices and to avoid gender adapters. The 2 m length provides flexibility for typical workstation and equipment-room setups while remaining compact for transport. The cable is designed to maintain signal integrity for RS232 communication, supporting common serial control and configuration tasks for networking, industrial and legacy computing equipment. Its straightforward design reduces setup time and potential wiring errors.

Suitable for

• Direct PC-to-PC serial file transfer and console connections
• Connecting routers, switches or modems for configuration via serial console
• Industrial equipment and PLC communication for programming and diagnostics
• Legacy devices and peripherals that use DB9 RS232 ports

Key specifications

• Connector type: DB9 female to DB9 female
• Interface standard: RS232 (serial)
• Cable length: 2 metres
• Colour: Black
• Pack quantity: single cable

How to use

Connect each DB9 female connector to the corresponding 9-pin serial port on the devices you need to link. Where required, ensure pinouts match the expected null modem wiring for direct device-to-device communication rather than a straight-through serial link. Power off equipment before plugging or unplugging connectors if devices do not have hot-pluggable serial ports. After connecting, configure serial communication parameters (baud rate, parity, data bits, stop bits, and flow control) on both devices to match for successful data transfer or console access.

Usage recommendations

Use this cable in controlled environments to reduce electrical interference; avoid routing it alongside high-voltage power cables. For longer runs or environments with strong electromagnetic noise, consider using shielded serial solutions or serial-to-USB adapters with appropriate grounding. Check device manuals for pinout and communication settings when establishing a connection.