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Two small beige DB9 female to RJ45 female adapters side by side

Tripp Lite

Tripp Lite Null Modem Adapter Kit 2x DB9F to RJ45F P450-000

SKU CH-08QA-3J984

Connects two DB9 serial ports up to 100 ft apart using standard Cat5 patch cables with full handshake support

  • Connect PCs up to 100ft apart using standard Cat5 patch cables
  • Two DB9F-to-RJ45 adapters included for immediate null-modem serial links
  • Full handshake wiring 1+6-4 2-3 3-2 4-1+6 5-5 7-8 8-7 ensures reliable data flow
  • Slotted knurled thumbscrews give secure tool-free attachment to equipment
  • Lifetime limited warranty backs the adapter kit for long-term confidence

Null Modem Adapter Kit for Serial Links

The Tripp Lite P450-000 kit provides two DB9 female to RJ45 female adapters that create a null modem wiring configuration between two serial devices. It is designed for technicians and integrators who need to extend RS-232 connections beyond standard cable limits using common structured cabling.

Extends RS-232 up to 100 ft over Cat5 or Cat6

Each adapter converts a DB9 port to an RJ45 jack so a standard patch cable carries the null modem circuit with full handshake signals. The link remains reliable up to 100 ft, but runs out of headroom beyond that distance or when the application demands signalling not defined by the RS-232 232 specification.

Fits existing DB9 ports and frees up cable stock

Slotted knurled thumbscrews secure the adapters to equipment without tools, letting builders use off-the-shelf Cat5 or Cat6 patch cords instead of specialised null modem cables. The compact 6.0 x 0.7 x 0.1 in form factor sits flush against the port, leaving adjacent connectors accessible.

How it compares

Measured against everything we stock in Cable Modems & Gateway Routers, at today’s prices. Recalculated every night.

Price $54.99
Cheaper than about 74% of the 122 comparable items (median $120.99).

Specifications

No published specifications for this item yet.

Questions about this item

Will this kit let me link a legacy DB9 serial port to another PC up to 100ft away using Cat5 cable?

Yes, the two DB9F-to-RJ45 adapters convert each serial port to RJ45 so you can run a standard Cat5 or Cat6 patch cable between them for a null-modem link up to 100ft.

How can I verify the null-modem wiring is correct after I connect the adapters?

The finished connection follows the pinout 1+6–4, 2–3, 3–2, 4–1+6, 5–5, 7–8, 8–7 with full handshake; a loopback test or terminal session showing bidirectional data confirms it.

Does the package include the Cat5 patch cable I need for the 100ft run?

No, the kit contains only the two DB9F-to-RJ45 adapters with slotted knurled thumbscrews; you must supply your own Cat5 or Cat6 patch cable.

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