Serial null modem cable StarTech 2 m DB9 RS232 F/M, black

The StarTech 2 m DB9 RS232 serial null modem cable (F/M) provides a straightforward wired connection for devices with 9‑pin serial ports. This 2‑metre cable has a DB9 male connector on one end and a DB9 female connector on the other, wired as a null modem to enable direct serial communication between two DTE devices without requiring a modem. It is suitable for point‑to‑point data transfer, device configuration, and linking legacy equipment in environments that still rely on RS232 interfaces.

Advantages

This serial null modem cable delivers a simple, reliable method for establishing RS232 links. The fixed 2 m length balances reach and signal integrity for most desktop and rack installations. The DB9 male and female connectors provide broad compatibility with computers, industrial controllers, POS terminals and other legacy systems. The cable is CE and RoHS certified and designed for repeated use in professional settings.

Suitable for

• Direct PC‑to‑PC file transfer via serial port
• Configuring routers, switches, and network equipment with serial consoles
• Connecting point‑of‑sale (POS) devices and cash registers
• Linking industrial controllers, PLCs and measurement instruments
• Serial communication with legacy terminals and embedded systems

Key specifications

• Cable length: 2 metres
• Connector types: DB9 male to DB9 female
• Wiring: null modem (DTE‑to‑DTE) configuration
• Interface standard: RS232 serial
• Color: black
• Compliance: CE and RoHS certified

How to use

Connect the DB9 male end to the serial port of one device and the DB9 female end to the serial port of the other device. Ensure both devices are powered off when attaching connectors to avoid electrical issues, then power the devices and configure matching serial settings (baud rate, parity, data bits, stop bits and flow control) on both endpoints. Use a terminal emulator or the device’s native configuration utility to establish the serial session and transfer data or perform configuration tasks.

Usage recommendations

For reliable communication, confirm the correct serial settings on both devices before initiating transfer. Keep cable runs away from high‑voltage or high‑frequency sources to minimise interference. For longer distances or environments with significant electrical noise, consider using converted solutions (e.g., RS232 to RS485 or serial-to-fiber) tailored to the installation requirements.