You’ll want a small set of reliable male‑to‑male modem cables at your desk for quick console access, legacy gear, or emergency serial recovery. Pick shielded DB9 leads with retention screws and the right pinout for your needs, and keep a couple lengths handy so you’re never caught short – there’s a surprising bit more to take into account before you buy.
| DTECH 6ft DB9 Male-to-Male RS232 Null Modem Cable |
| Reliable Everyday | Connector type: DB9 male (both ends) | Primary use / compatibility: RS-232 serial DTE-to-DTE communication | Cable length: 6 ft | VIEW LATEST PRICE | Read Our Analysis |
| DTECH 6ft RS232 DB9 Male-to-Female Null Modem Cable |
| Extension Essential | Connector type: DB9 male (one end) / DB9 female (other end) | Primary use / compatibility: RS-232 serial DTE-to-DTE communication (male–female extension) | Cable length: 6 ft | VIEW LATEST PRICE | Read Our Analysis |
| DTECH RS232 Null Modem DB9 Male-to-Male Serial Cable |
| Pro Handshaking | Connector type: DB9 male (both ends) | Primary use / compatibility: RS-232 serial DTE-to-DTE communication (full handshaking) | Cable length: 1.5 ft | VIEW LATEST PRICE | Read Our Analysis |
| QBGTFAK RJ11 Male-to-Male Telephone Cable 8M |
| Long Phone Lead | Connector type: RJ11 male (both ends) | Primary use / compatibility: Telephone/phone line, modem, fax | Cable length: 8 m (≈26.2 ft) | VIEW LATEST PRICE | Read Our Analysis |
| DTECH RS232 DB9 Null Modem Serial Cable 15ft |
| Extra Reach | Connector type: DB9 male (both ends) | Primary use / compatibility: RS-232 serial DTE-to-DTE communication | Cable length: 15 ft | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
DTECH 6ft DB9 Male-to-Male RS232 Null Modem Cable
If you need a simple, reliable way to link two DTE devices for serial communication, the DTECH 6ft DB9 male-to-male RS232 null modem cable is a solid choice. You’ll connect PCs, laptops, routers, switches, or hubs via COM ports using its null-modem wiring: TX/RX crossed (pins 2–3) with a common signal ground, no hardware handshaking lines used. The 6-foot black cable has shielded AL-foil, 30 AWG color-coded wires that are easy to solder, and DB9 male connectors with retention screws for a secure fit. Note it won’t work with 15-pin VGA/video ports.
- Connector type:DB9 male (both ends)
- Primary use / compatibility:RS-232 serial DTE-to-DTE communication
- Cable length:6 ft
- Color:Black
- Shielding / construction:AL-foil shielded, 30 AWG conductors
- Intended connection security / fastening:DB9 screw retention (captive screws)
- Additional Feature:3-wire null crossover
- Additional Feature:AL foil shielding
- Additional Feature:30 AWG solderable wires
DTECH 6ft RS232 DB9 Male-to-Female Null Modem Cable
Choose the DTECH 6ft RS232 DB9 male-to-female null modem cable when you need a simple, reliable link between two 9-pin DTE devices-its 3-wire null wiring (TX/RX and signal ground) and screw-secured DB9 connectors make setup quick and stable for router-to-PC console access, serial debugging, or direct file transfers. You’ll get a six-foot black cord with DE9 male-to-female ends, 30 AWG conductors, standard color coding, and AL-foil shielding for noise reduction. It’s designed for RS-232 COM ports (not a 15-pin VGA), easy to solder if you modify it, and ideal for router connections, switch hubs, or direct serial comms.
- Connector type:DB9 male (one end) / DB9 female (other end)
- Primary use / compatibility:RS-232 serial DTE-to-DTE communication (male–female extension)
- Cable length:6 ft
- Color:Black
- Shielding / construction:AL-foil shielded, 30 AWG conductors
- Intended connection security / fastening:DB9 screw retention (screws on each end)
- Additional Feature:Male-to-female extension
- Additional Feature:3-wire simple crossover
- Additional Feature:Captive screws on ends
DTECH RS232 Null Modem DB9 Male-to-Male Serial Cable
The DTECH RS232 Null Modem DB9 male-to-male cable is ideal for technicians and hobbyists who need a short, reliable link between two DTE devices-its full 7-wire crossover wiring provides proper TX/RX and hardware handshaking for stable serial communication. You’ll get a 1.5-foot black cord with DE-9 male connectors and captive screws, 30 AWG wiring following RS-232 color codes, and aluminum foil shielding to reduce noise. It crosses TX↔RX, RTS↔CTS, and DTR↔DSR for full handshaking, works with PCs, routers, USB-to-serial adapters, and lab gear, and isn’t compatible with 15-pin VGA monitor ports.
- Connector type:DB9 male (both ends)
- Primary use / compatibility:RS-232 serial DTE-to-DTE communication (full handshaking)
- Cable length:1.5 ft
- Color:Black
- Shielding / construction:AL-foil shielded, 30 AWG conductors
- Intended connection security / fastening:DB9 captive screws for secure connection
- Additional Feature:Full 7-wire handshaking
- Additional Feature:Short 1.5 ft length
- Additional Feature:RTS/CTS and DTR/DSR crossed
QBGTFAK RJ11 Male-to-Male Telephone Cable 8M
For anyone needing a simple, reliable phone line extension, the QBGTFAK RJ11 male-to-male cable delivers an 8‑meter reach with two conductors for straightforward connections to telephones, fax machines, or modems. You’ll appreciate the plain white, 4 mm plastic cord when you need a tidy, unobtrusive run across a desk or along a wall. The RJ11 male ends plug into standard wall jacks and devices, supporting straight wire line signals without fuss. It’s sold as a single 8 m cable, so you won’t overbuy. If you need basic voice or analog data continuity, this cable does the job.
- Connector type:RJ11 male (both ends)
- Primary use / compatibility:Telephone/phone line, modem, fax
- Cable length:8 m (≈26.2 ft)
- Color:White
- Shielding / construction:Plastic jacket, 2 conductors (telephone cord)
- Intended connection security / fastening:Push-fit RJ11 latching plugs
- Additional Feature:RJ11 two-conductor cord
- Additional Feature:8 m (26.2 ft) long
- Additional Feature:White plastic jacket
DTECH RS232 DB9 Null Modem Serial Cable 15ft
If you need a simple, dependable way to link two RS-232 devices without hardware handshaking, the DTECH 15 ft DB9 null modem cable gives you a ready-made 3-wire solution that crosses TX/RX and signal ground for direct PC-to-PC or device-to-device serial communication. You’ll get a black, 15-foot DE9/DB9 male-to-male cable with standard RS-232 pinout and wire color coding. The shielded AL-foil jacket and 30 AWG conductors keep noise down; screw-fastened 9-pin male connectors stay secure and are easy to solder if you need custom wiring. It’s for DTE-to-DTE COM port links- not a 15-pin VGA cable.
- Connector type:DB9 male (both ends)
- Primary use / compatibility:RS-232 serial DTE-to-DTE communication
- Cable length:15 ft
- Color:Black
- Shielding / construction:AL-foil shielded, 30 AWG conductors
- Intended connection security / fastening:DB9 screw fasteners for secure connection
- Additional Feature:15 ft extended length
- Additional Feature:3-wire TX/RX ground only
- Additional Feature:DB9 screw fasteners
Factors to Consider When Choosing Male-Male Modem Cables
When choosing a male-male modem cable, you’ll want to check the cable wiring type to guarantee signals map correctly and whether the connector genders match your devices. Consider length and reach so the cable fits your setup, plus shielding and durability for noise protection and longevity. Finally, decide if you need handshaking support to carry control signals for reliable communication.
Cable Wiring Type
Choose the right wiring type by matching the cable’s pin mapping to how your devices talk: null-modem (crossover) wiring swaps TX and RX so two DTEs can communicate directly, straight-through keeps pins one-to-one for DTE-to-DCE setups, and within null-modem options you’ll pick three-wire if you only need TX/RX and ground or seven-wire if you require RTS/CTS and DTR/DSR hardware handshaking. Decide based on whether your equipment uses hardware flow control: if your apps or peripherals rely on RTS/CTS or DTR/DSR, get a 7-wire null-modem to emulate modem signals and avoid dropped data. If devices only use basic serial traffic, a 3-wire null-modem saves cost and complexity. Use straight-through only when a modem or adapter provides signal direction.
Connector Gender Match
Because two male DB9 ends are required to plug directly into device COM ports, you should confirm both devices expect male connectors and that each port is a DE-9/DB9 layout with the correct 9-pin count. Check whether the link is between two DTEs; male-to-male cables commonly serve that role and may require null-modem (crossover) wiring to route TX/RX and control lines correctly. Inspect male connectors for retention screws if you need a vibration-resistant, secure fit. If you plan to use inline adapters or gender changers, verify their combined effect so each device still sees the proper male/female pairing-don’t accidentally create two males or two females in series. Match gender, pins, and wiring before buying.
Length And Reach
After confirming connector gender and wiring, you’ll want to decide how long the cable needs to be so it reaches comfortably without excess slack. Measure the physical distance between devices and add 10–20% slack for routing, bends, and connector bulk. Keep runs as short as practicable: longer RS-232 cables raise capacitance and noise susceptibility, hurting signal integrity. For low-speed serial links under 9600 bps, runs up to about 50 feet are often reliable; at higher baud rates like 115200 bps, limit length to a few meters. Factor in routing constraints-walls, conduit, trays-and avoid tight bends that stress the jacket or conductors. Plan modestly for reconfiguration with a slightly longer cable, but avoid excessive length that creates signal loss and clutter.
Shielding And Durability
When you’re picking a male‑male modem cable, pay close attention to shielding and mechanical durability because they directly affect signal integrity and lifespan in real‑world setups. Choose aluminum foil or braided shields to reduce EMI and crosstalk, especially for longer runs or noisy environments. Prefer a grounded shield with a drain wire for a low‑impedance return path-critical for low‑voltage RS‑232 signaling. Look for higher percent braid or multi‑layer shields when interference is severe, aware that they make cables stiffer. For daily use, favor heavier outer jackets, strain relief at connectors, and robust molded ends to resist abrasion and bending. Finally, make certain solid connector retention-screws or locking mechanisms-to prevent intermittent faults from connector movement.
Handshaking Support Needed
If your devices need hardware flow control or modem signals, pick a cable that carries and crosses the necessary lines (RTS/CTS, DTR/DSR, CD, etc.), because relying on just TX/RX and ground can cause overruns or lost carrier indications on high‑speed, long, or modem‑dependent links. Decide whether your application demands full handshaking or if a simple 3‑wire null‑modem suffices for console work or short, low‑speed file transfers. For sustained, high‑speed transfers or long runs, choose cables that implement and cross RTS↔CTS and DTR↔DSR and provide carrier detect where needed. If you rely on modem control for remote reset or carrier sense, verify the exact pinout and crossed lines against your port documentation before buying to avoid compatibility problems.
Conductor Gauge Choice
Although cable pinout and handshaking matter, you also need to pick the right conductor gauge because wire thickness directly affects resistance, noise susceptibility, and mechanical durability. For short RS-232-style runs a few meters long, 28–30 AWG is usually fine: it’s flexible, lightweight, and economical. If you need longer reach or operate in electrically noisy environments, choose 26 AWG or thicker to lower DC resistance, reduce voltage drop, and limit attenuation. Thicker conductors also tolerate repeated flexing and soldering better, so they last through installs and repairs. Avoid very thin wires for long or high-interference runs; their higher resistance raises noise susceptibility and caps reliable length. Balance flexibility, cost, and durability when you pick a gauge.
Device Compatibility
Picking the right conductor gauge matters, but you also have to make sure the cable actually matches the devices it’s connecting. First, verify both ends use the same physical connector (DE‑9/DB9, RJ11, etc.) so you won’t need adapters. Confirm the serial standard and pinout: DTE‑to‑DTE needs a null‑modem/crossover wiring, while DTE‑to‑DCE uses straight wiring to keep TX/RX and grounds correct. Check whether hardware handshaking (RTS/CTS, DTR/DSR) is required and pick a cable wired for full handshaking if so; don’t rely on a minimal 3‑wire lead. Match signal voltage and grounding expectations (TTL vs RS‑232) to prevent damage. Finally, choose length and shielding based on the interface tolerances and the environment’s noise and baud‑rate needs.
