RS232 Crossover Cable – Dependable DB9 9-Pin Male-to-Male 23 Crossover Null Modem, 1.5–5m | DTECH DT-9006A

An RS232 crossover cable is the essential tool for any engineer, technician or network professional who needs to communicate directly between two RS-232 serial devices without an intermediate modem or converter. The DTECH DT-9006A is a DB9 male-to-male serial cable wired in the 23 crossover (null modem) configuration, built with a tinned copper core, nickel-plated connectors and an environmentally friendly PVC jacket that delivers professional-grade reliability in both office and industrial environments.

What Is a 23 Crossover (Null Modem) RS232 Cable?

Standard RS-232 serial cables use straight-through wiring — Pin 2 to Pin 2, Pin 3 to Pin 3. This works when connecting a DTE device (a PC) to a DCE device (a modem), because the modem’s RX pin is wired to the PC’s TX pin internally. However, when connecting two DTE devices (PC to PC, PC to PLC, PC to router serial console), both devices transmit on Pin 3 and receive on Pin 2 — creating a conflict if a straight-through cable is used. The 23 crossover solves this by crossing Pin 2 and Pin 3: one end’s TX (Pin 3) connects to the other end’s RX (Pin 2), and vice versa, with Pin 5 (GND) connecting straight through. This is the fundamental null modem wiring defined by the TIA/EIA RS-232 standard for DTE-to-DTE communication. Before purchasing, confirm your devices require 23 crossover wiring — if your devices require full crossover with hardware handshaking lines, a different cable is needed.

Key Applications

The DT-9006A is the correct cable for: accessing the serial console port of routers, managed switches, firewalls, and access points during setup and troubleshooting; configuring and programming PLCs, CNC machines, energy meters and industrial controllers via RS-232; connecting test equipment and diagnostics tools to serial devices; legacy serial file transfers between PCs; and direct serial communication between any two DTE devices that both expose male DB9 COM ports.

Construction That Performs

Inside the DT-9006A, the tinned copper core maintains consistent conductivity over years of use by resisting the oxidation that degrades bare copper — particularly relevant in environments with humidity variation or temperature cycling. Nickel-plated DB9 connector shells provide a corrosion-resistant, mechanically secure fit that holds up across the repeated insertion and removal cycles expected in professional environments. The environmentally friendly PVC outer jacket is flexible enough for clean cable management and robust enough for daily industrial use.

Plug-and-Play Across All Platforms

No drivers or software configuration are needed. The DT-9006A supports the RS-232 serial protocol natively and is immediately recognised by Windows, Linux, industrial HMIs, SCADA platforms and embedded controllers. Connect it between your COM port devices and you’re ready to communicate.

Available in 4 Lengths

Choose from 1.5m, 2m, 3m or 5m depending on your installation. The 1.5m is ideal for workbench diagnostics and desktop configurations; 3m and 5m suit rack-to-device connections and panel installations where equipment is mounted at a distance.

For straight-through RS-232 serial cables, see the RS232 straight-through cable range in our industrial serial product category. Browse our complete industrial serial product range at bam.ae for converters, adapters and Ethernet serial servers.

Specifications Table