RS232 Female to Female Full Crossover Cable – Full Handshaking DB9 F-F, 0.5–5m | DTECH DT-9007C

An RS232 female to female full crossover cable is the correct null modem cable when both serial devices in a connection present male DB9 plugs and require full hardware handshaking signals to be crossed. The DTECH DT-9007C provides two female DB9 sockets — one at each end — that accept both devices’ male plugs directly, with TX/RX, RTS/CTS and DTR/DSR all crossed end-to-end inside a single cable. Built with a tinned copper core, nickel-plated connectors and an environmentally friendly PVC jacket, it replaces the combination of a separate null modem coupler, gender changer and extension lead with a single reliable cable.

When Do You Need an RS232 Female to Female Full Crossover Cable?

The most common RS-232 COM port on a PC is female — but many industrial and embedded devices present their serial ports as male DB9 plugs: controllers, test instruments, data loggers, modems, barcode systems and factory automation equipment frequently fall into this category. When two such devices — both with male DB9 serial ports — need to communicate directly with full null modem wiring, the DT-9007C is the required cable. Its female sockets accept both male connectors and its internal full crossover wiring handles the signal routing without any additional adapters. The DT-9007C also serves as a full null modem coupler between two serial cables that each end in a male DB9 plug. It completes the DTECH full crossover series alongside the RS232 full crossover cable M-M (DT-9007A, for two devices with female DB9 ports) and the RS232 male to female full crossover cable (DT-9007B, for mixed-gender connections).

What Full Crossover Wiring Provides

Standard RS-232 serial communication can operate on just three wires — TX, RX and GND. Many devices, however, use hardware flow control signals to manage data transfer and confirm device readiness: RTS (Request to Send), CTS (Clear to Send), DTR (Data Terminal Ready) and DSR (Data Set Ready). As defined by the TIA/EIA RS-232 standard, these signals are precisely specified on the DB9 pinout. The DT-9007C crosses Pins 2↔3 (TX/RX), Pins 7↔8 (RTS/CTS) and Pins 4↔6 (DTR/DSR), with Pin 5 (GND) straight through. This ensures that every device output signal reaches the correct input pin on the other end — devices that check CTS or DSR before transmitting will communicate correctly without additional hardware. Always confirm your device’s required wiring configuration from its documentation before purchasing.

Full Crossover vs 23 Crossover — F-F Variants

The DT-9007C is one of two female-to-female serial cable types in the DTECH range. The DT-9006C (RS232 F-F 23 crossover cable) crosses only Pins 2 and 3 — a 3-wire null modem configuration for devices that communicate without hardware handshaking. The DT-9007C crosses all functional signal pairs, making it necessary when devices rely on RTS/CTS or DTR/DSR for flow control. The device manual specifies which wiring is required.

Reliable Construction for Professional Use

The DT-9007C RS232 female to female full crossover cable uses a tinned copper core that resists oxidation and maintains low contact resistance across years of use in industrial environments, including factory floors, server rooms and control cabinets subject to temperature cycling and regular handling. Nickel-plated DB9 connectors provide corrosion-resistant mating surfaces and mechanical durability through repeated connection cycles. The environmentally friendly PVC outer jacket is flexible for routing in tight cable trays and equipment bays while remaining durable under professional daily use.

Plug-and-Play, Five Length Options

No configuration or drivers required. The DT-9007C supports the RS-232 serial protocol natively on Windows, Linux, macOS, industrial HMIs and SCADA platforms. Available in 0.5m, 1.5m, 2m, 3m and 5m — 0.5m suits tight panel and back-of-rack connections; 3m and 5m span adjacent equipment bays and control cabinet runs.

Typical applications include: direct serial connection between two devices with male DB9 ports requiring full handshaking null modem wiring, null modem coupler use between two male-terminated serial cables, PLC and industrial controller serial configuration, test and measurement equipment integration, factory data acquisition systems, and legacy serial communication where full hardware handshaking is required.

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Specifications Table