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Black DB9 male to RJ45 female modular adapter connector

Black Box Corporation

Black Box FA4509M-BK DB9 Male to RJ45 Female Modular Adapter Connector

SKU CH-1MEQ-7YV22 MPN FA4509M-BK

Converts a DB9 serial port to an RJ-45 or RJ-11 connection for patch-panel mounting

  • Adapter typeDB-9/RJ-45
  • Product colorBlack
  • Product typeModular Adapter Kit DB9M to RJ-45F
  • DetailsConvert DB9 interfaces to RJ-45 or RJ-11. Can be mounted in
  • Key featuresConvert DB9 interfaces to RJ-45 or RJ-11. Can be mounted in
  • Converts DB9 serial ports to RJ45 or RJ11 network jacks
  • Mounts directly into any blank patch panel for tidy integration
  • Gold-nickel plated contacts resist corrosion and maintain signal quality
  • RoHS and WEEE certified with PVC insulation for environmental compliance
  • Lifetime guarantee from Black Box backs long-term reliability

DB9 Male to RJ45 Female Adapter

This Black Box modular adapter converts a 9-pin DB9 male serial port to an RJ45 female jack. It accepts both RJ-45 and RJ-11 plugs for flexible cabling. The unit is designed to mount in a blank patch panel for tidy rack installations. It ships unassembled in a black PVC housing with gold-nickel plated contacts.

Suited for serial-to-network patching

Technicians extending legacy serial gear over structured wiring will find this adapter a direct fit. It is not for buyers who need a powered signal converter or protocol translation. It also does not suit applications requiring a pre-assembled, moulded cable assembly. The lifetime guarantee covers the passive connector hardware only.

Passive pin-out under sustained use

Because the adapter contains no active electronics, its behaviour under continuous load is defined entirely by the attached cable runs and connected devices. Contact resistance stays stable as long as the gold-nickel plating remains clean and seated. No heat is generated by the adapter itself during extended sessions. RoHS and WEEE compliance confirms the materials meet environmental standards.

How it compares

Measured against everything we stock in Plugs & Connectors, at today’s prices. Recalculated every night.

Price $20.99
Pricier than about 71% of the 144 comparable items (median $15.99).

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Specifications

Product
Brand nameBlack Box
Model nameFA4509M-BK
Product colorBlack
Product typeModular Adapter Kit DB9M to RJ-45F
Adapter typeDB-9/RJ-45
Size & build
Shipping weight0.45 kg
Package size51 × 25 × 13 mm

Questions about this item

What DB9 serial device do I need to connect this Black Box FA4509M-BK adapter to?

Connect the 9-pin DB9 male end of the adapter to any standard DB9 female serial port on your equipment.

Will this adapter fit into my existing patch panel alongside older RJ45 keystones?

The modular adapter can be mounted in a blank patch panel opening and presents a standard RJ45 female jack.

How can I verify the gold-plated contacts are making a solid connection after I assemble the kit?

After assembly, plug a known-good RJ45 cable into the female jack and confirm link lights or serial communication on the connected DB9 device.

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