DB9 to RJ45 Modular Adapter - F/F

Convert your DB9 male connector into an RJ45 female connector

Product ID: GC98FF

4 stars (2 reviews) |
  • 1x DB9 female connector
  • 1x RJ45 female connector
Your price

The GC98FF Modular Adapter features a DB9 female connector and an RJ45 female connector. Used for modular RS232, RS422 and RS485 connections, the adapter converts your DB9 male connection into an RJ45 female connection. The adapter allows for custom serial pin out configurations.

The DB9F/RJ45F adapter is backed by lifetime warranty, guaranteeing long-lasting durability.


  • Used for modular RS232, RS422, and RS485 connections

The StarTech.com Advantage

  • Can be used to make customized serial connections
  • Guaranteed reliability

Partner Numbers

  • Ingram Micro Colombia 1584725
  • UPC 065030773508


Warranty Information Warranty Lifetime
Connector(s) 1 - Connector A DB-9 (9 pin, D-Sub)
1 - Connector B RJ-45
Packaging Information Package Height 0.0 in [0.1 mm]
Package Length 4.9 in [12.5 cm]
Shipping (Package) Weight 0.7 oz [21.0 g]
Package Width 3.5 in [90.0 mm]
Physical Characteristics Product Height 0.6 in [1.6 cm]
Product Length 3.3 in [8.5 cm]
Weight of Product 0.6 oz [18.0 g]
Product Width 1.3 in [3.4 cm]
Color Black
What's in the Box 1 - Included in Package DB9 to RJ45 Serial Port Adapter


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Frequently Asked Questions

Before You Buy

A straight-through serial cable is the most common type of serial cable, used to connect a Data Terminal Equipment (DTE) device (for example, a computer) to a Data Communications Equipment (DCE) device (for example, a modem). The pinout of the serial connectors on both sides of the cable are exactly the same with a straight-through serial cable.

A null modem serial cable (frequently called a crossover cable) is used to connect two DTE devices together without the use of a DCE device in between. For this to happen, the Transmit (TXD) and Receive (RXD) pins on one of the serial connectors are flipped.

To confirm the type of serial cable that is required for your device or configuration, refer to the information provided by the manufacturer.

Compliance and safety

Compliance letters

Safety Measures

  • If product has an exposed circuit board, do not touch the product under power.
  • If Class 1 Laser Product. Laser radiation is present when the system is open.
  • Wiring terminations should not be made with the product and/or electric lines under power.
  • Product installation and/or mounting should be completed by a certified professional as per the local safety and building code guidelines.
  • Cables (including power and charging cables) should be placed and routed to avoid creating electric, tripping or safety hazards.
*Product appearance and specifications are subject to change without notice.

Customer Reviews

(2 reviews)
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1 - 2 of 2 Reviews
(3 Stars)

Useful, but some work required

By: jscott - 06/17/2020
Very handy for me, but the color coding is non-standard and not easy to work out. It would be very helpful to have this information included in the packaging.
| Helpful?
Stacey, Customer Support on 6/17/2020 3:42:15 PM
Hello, Thank you for your review. The pinout information is available under the Support Tab on our website. Here is a direct link: https://sgcdn.startech.com/005329/media/sets/GC98FF_Manual/GC98FF%20Pinout%20Diagram.pdf Please feel free to reach out if you require any assistance. We offer free lifetime technical support with all our products.
(5 Stars)

Solid build. Clear documentation.

By: bleepblorp - 04/02/2021
I bought several of these to integrate AV receivers into my home automation. The pinout document is the easiest to read that I've seen for this type of product. Thanks!
| Helpful?
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