Monoprice

Monoprice 101153 DB9F to RJ45 Modular Adapter

3.0 (1 reviews)

Create Custom Serial Connections with the Monoprice DB9F/RJ-45 Modular Adapter The Monoprice DB9F/RJ-45 Modular Adapter allows you to easily extend your serial (DB9) connections using standard 8-conductor CAT5 cables. A cost-effective and customizable solution for various networking and communica...

$3.78*
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*Price sourced from Amazon.com. Last updated:Jul 16, 2026.Price and availability are subject to change.

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Overview

Create Custom Serial Connections with the Monoprice DB9F/RJ-45 Modular Adapter

The Monoprice DB9F/RJ-45 Modular Adapter allows you to easily extend your serial (DB9) connections using standard 8-conductor CAT5 cables. A cost-effective and customizable solution for various networking and communication applications.

Specifications:

  • Connector 1: DB9 Female
  • Connector 2: RJ-45 Modular Jack
  • Application: Serial (DB9) Extension
  • Wiring: 8-Pin Adapter
  • Color: Black

Key Features

DIY solution for using 8 conductor CAT5 cables to extend your Serial (DB9) connections.

Monoprice continually strives to improve its product line to bring our customers the best products available

Therefore changes may be made to listed specifications without prior notice

Item received may not match photo or specs shown

8 pin adapter.

Specifications

Connector 1
DB9F
Connector 2
RJ45 Modular Adapter
Conductors Supported
8-conductor
Cable Type Compatibility
CAT5

Pros & Cons

👍 Pros

  • Provides a DIY solution, allowing users to create custom-length serial extensions using readily available 8-conductor CAT5 cables
  • This adapter is specifically designed to extend Serial (DB9) connections, making it useful for legacy and industrial applications
  • The 8-pin adapter design ensures full compatibility with standard 8-conductor CAT5 cables for reliable signal transmission
  • Offers a cost-effective alternative to pre-made serial extension cables, especially for longer runs
  • Simplifies wiring and cable management by utilizing common networking cable infrastructure for serial data

👎 Cons

  • This product is a modular adapter and requires user assembly or crimping of an RJ45 connector onto a CAT5 cable, which might not be suitable for all users
  • Its primary function is for DIY solutions, meaning it's not a plug-and-play cable and requires additional components and tools
  • The specifications note that changes may be made to listed specifications without prior notice, which could lead to variations
  • The item received may not precisely match the photo or specs shown, potentially causing minor discrepancies for specific setups
  • Without clear instructions or wiring diagrams, users new to serial over Ethernet solutions might face a learning curve

Frequently Asked Questions

The primary purpose is to provide a DIY solution for extending Serial (DB9) connections using standard 8-conductor CAT5 cables.
This modular adapter is designed to be used with 8-conductor CAT5 cables.
No, it is a modular adapter that forms part of a DIY solution, requiring assembly with a CAT5 cable to create the extension.
The listing describes it as a DIY solution, implying users might need to be familiar with serial over RJ45 wiring or seek external guidance.
This adapter converts a DB9F port to an RJ45 modular jack, allowing an RJ45 terminated cable to connect to the DB9 serial device for extended runs.