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Cutting Edge Electronics since 1982
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DB9 to RJ45 Modular Serial Adapter (F/F), RS-232, RS-422, RS-485

Model # P44089FF

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Modular DB9 to RJ45 converter allows a serial signal to be sent over twisted-pair Cat5e/6 cable. Recommended for creating customized connections with terminals, serial printers, modems, POS and other serial devices.
The P440-89FF DB9 to RJ45 Modular Serial Adapter (F/F) is designed for connecting terminals, serial printers, modems, POS and other serial devices to your network via twisted-pair Cat5e/6 cabling. This saves you time and money by eliminating the need to upgrade your existing hardware.

The adapter features a female DB9 serial connector with color-coded twisted-pair wires on one side and an RJ45 female connector on the other, allowing you to create customized RS-232, RS-422 and RS-485 connections. You can connect dumb desktop terminals to a central patch or directly to an MUX. Slotted, knurled thumbscrews provide a quick, secure attachment to your device. Color-coded wiring simplifies troubleshooting.
Create Customized Serial Cable Configurations

  • DB9 to RJ45 adapter allows serial signal to be transmitted over twisted-pair cable
  • Connects terminals, serial printers, modems, POS and other serial devices to Cat5e/6 cabling
  • Converts DB9 female connection to RJ45 female connection
  • Connects dumb desktop terminals to central patch or directly to MUX
  • Color-coded wires to simplify troubleshooting
  • Slotted, knurled thumbscrews for easy, secure attachment
  • Ideal for modular RS-232, RS-422 and RS-485 serial connections

System Requirements
  • PC or other device with DB9 male connector

Package Includes
  • P440-89FF DB9 to RJ45 Modular Serial Adapter (F/F)


  • Converts DB9 female connection to RJ45 female connection
  • Compatible with readily available Cat5e/6 patch cables
  • Slotted, knurled thumbscrews for easy, secure attachment
  • Color-coded wires to simplify troubleshooting
  • Ideal for customizing RS-232, RS-422 and RS-485 connections
UPC Code 037332206329
Color Black
Shipping Dimensions (hwd / in.) 0.50 x 3.94 x 5.30
Shipping Weight (lbs.) 0.20
Side A - Connector 1 DB9 (FEMALE)
Side B - Connector 1 RJ45 (FEMALE)
Technology Cat5/5e; Cat6; Cat6a; Modem; Null Modem; Serial (RS232)
Certifications RoHS Compliant
Product Warranty Period (Worldwide) Lifetime limited warranty

Extended warranties are usually very inexpensive and can save you thousands in the future. It's simple and inexpensive to purchase extended warranties and one of the smartest ways to protect your investment.

Electronics can be large, heavy, and expensive and you probably don't have the special tools or expertise needed to fix them in a crisis. If you can spare a few thousand dollars without batting an eyelash for new electronics should they break tomorrow, don't buy a warranty. But if you're like most of us, protect yourself by purchasing inexpensive extended warranties when you buy a new product and save yourself big money in the long run.

Professional delivery and installation is available for every product we sell. We would be happy to coordinate delivery and installation for you.

Questions or Comments?
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