DTECH DB9 RS232 Serial Cable Male to Female Extension Null Modem Cord Cross TX RX line for Data Communication (10 Feet, Black)
4.1 out of 5 stars 53 reviews
Price: Click to see price
  • Make sure this fits
  • by entering your model number.
  • Simple 10ft null modem extension cable (3 wire type and no hardware handshaking) extends a COM port connection between computer and some old device with RS-232 compatible
  • Wired as a 9 pin serial cable male to female port cord that 2-3 line are crosslinked (only TX/RX data and signal ground wires connected); standard shielded with AL foil
  • DB9 m/f adapter extender equipped with screws on each end to ensure an easy and solid connection for stable data communication
  • The wires inside are of 30AWG gauge and easy to solder to, and they connect to the pins in the order of the standard wire color code
  • 10 feet long RS232C cable for hooking up RS232C equipment like scanner, Modem, printer, plotter, camera, barcode / embroidery machine, touchscreen, microcontroller, factory test equipment



Simple Null Modem Cable:

Need a three wire null modem serial extension cable (TX, RX and GND) that is long enough to control your legacy equipment, so you can program a outdoor digital sign from the comfort of indoor office? This 10ft 9 pin male to female serial adapter (cross wired between TX and RX line) enables you to extend original serial to serial cord and move the device to a far corner where you need it to reach.

9 pin serial cable male to female is with gold plated pins for superior corrosion resistance ensuring a solid connection.

For RS232 devices below (partial):


vinyl cutting/ sewing machine


radio transceiver

subwoofer/speaker set

weather station

controller to camera


1.Shielded with standard Foil-Al layer shielding as most cables do, it fits for most of jobs.

2.It’s not a 15 pin VGA cable that connects monitor to laptop, is only for RS 232 communication port to interface one system to another system.


Usage: for extending a 9 pin serial male to male cable, or connect it to an old serial port device along with a serial to USB converter

Connectors: DB9 to DB9 (Male-Female)

Cable Diameter: 6mm

Cord Length: 10 ft (3 meters)

What’s Included:

1 x RS-232C Serial Male to Female TX/RX crosslinked Cable (Black)

1 x User Manual