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DB9 Extension Cable - Male/Female


Extend RS-232 Peripherals | Fully Molded | Thumbscrews | Standard Pinout | Fully Shielded

Serial Computer Cables - 6FT DB9 Extension Serial Cable

DB9 Male to Female Cables are commonly used for serial peripheral devices like keyboards, mice, joysticks, and many other devices. The fully molded connectors with thumbscrews provide you with a quick and easy connection. DB9 Male to Female cable is wired with a standard straight through pinout. This cable can be used as an extension cable.


  • Connector A: DB9 Female
  • Connector B: DB9 Male
  • Add your RS-232 serial peripherals to a switchbox
  • Fully molded connectors
  • Includes Thumbscrews
  • All lines wired straight through
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Product Questions

According to your blog post on cable distance limits (Feb-9-2019), RS-232 cables start to experience data loss at 49'. Is this available in a slightly shorter length to avoid that data loss?
Question by: Matt on Nov 3, 2021, 10:37 AM
The closest length we stock under 50 feet is 25 feet. If you go to our custom cable builder on our website or call our team at 1-888-519-9505 we can build a custom length for you.
Answer by: David Gust on Nov 3, 2021, 11:51 AM

Q: What is a null modem cable?

A: A null modem cable connects to two standard serial ports for networking two computers together. Null modem cables enable direct data transfer with minimum setup. Null modem cables reverse the transmit and receive lines on each end of the cable to enable direct two-way communication. A null modem cable for PCs ordinarily follows the RS-232 standard and uses the same serial ports as RS-232 cables.

Q: What is the difference between a DB15 and HD15 connector?

A: A DB15 connector has 15 pins arranged in two rows with one row on top of the other. The top row has 8 pins and the lower row has 7. A DB15 connector can be found on sound cards older AUI network cards and devices as well as legacy Macintosh® monitors.

A: An HD15 connector has 15 pins arranged in three rows. Each row has 5 pins with the middle row slightly offset from the top and bottom. A HD15 connector is sometimes called HD DB15 or VGA connector. The HD15 connector is a very common connector used mostly as a video interface for computers and monitors. It can also be found on HD displays and on older HD source devices such as satellite receivers and cable boxes.

What is a Parallel Cable?

A: A parallel cable is used to connect to the parallel ports on a computer and a peripheral device like a printer or external drive. IBM originally developed parallel ports and cables as a mean for connecting a printer to the earliest personal computers.