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Small beige DB9-to-RJ45 serial adapter with knurled thumbscrews and color-coded wires

Tripp Lite

Tripp Lite P440-89FM DB9 to RJ45 Serial Adapter

SKU CH-0E1E-VWK2J

Converts a DB9 male port to an RJ45 female jack for RS-232, RS-422 or RS-485 links using standard Cat5e/6 patch cables, with thumbscrews and colour-coded wires for secure, easy installation

  • Connect RS-232/422/485 gear via standard Cat5e/6 cable
  • DB9 male to RJ45 female for direct modular serial links
  • Knurled thumbscrews lock the adapter firmly in place
  • Colour-coded wiring speeds fault-finding on custom pinouts
  • Ready to use — single adapter converts legacy ports instantly

DB9 to RJ45 serial adapter

The Tripp Lite P440-89FM converts a DB9 male port to an RJ45 female jack for RS-232, RS-422 and RS-485 links. It suits installers and technicians who need a quick gender change on legacy serial gear. The adapter ships as a single unit with color-coded wiring for easier fault finding. It is not for users who require a USB or Ethernet interface instead.

Sustained signal integrity

The passive design carries serial data over standard Cat5e or Cat6 patch cables without active circuitry. Performance stays consistent across long cable runs because there are no chips to overheat or require firmware updates. Signal quality depends on the cable used and the serial protocol configured. It is not for applications that demand galvanic isolation or signal regeneration.

Thermals noise and power

No external power is needed and the adapter generates no audible noise during operation. The all-metal housing with knurled thumbscrews stays at ambient temperature even during continuous data transfer. There are no fans, LEDs or active components to draw current. It is not for environments that require ruggedised IP-rated enclosures.

Highlights

  • Connect RS-232/422/485 gear via standard Cat5e/6 cable
  • DB9 male to RJ45 female for direct modular serial links
  • Knurled thumbscrews lock the adapter firmly in place
  • Colour-coded wiring speeds fault-finding on custom pinouts
  • Ready to use — single adapter converts legacy ports instantly

Specifications

No published specifications for this item yet.

Questions about this item

Does the P440-89FM adapter generate any noise or heat when used continuously?

The P440-89FM is a passive serial adapter with no active electronics, so it produces no noise or measurable heat during all-day operation.

What cable type must I already own to connect this DB9-to-RJ45 adapter?

You need a standard Cat5e or Cat6 patch cable with RJ45 plugs to complete the link between the adapter and your equipment.

Will the P440-89FM work with legacy RS-232, RS-422 and RS-485 gear I still use?

Yes, the adapter is designed for customizing RS-232, RS-422 and RS-485 connections, so it integrates directly with those older serial interfaces.

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