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Black Box DB9 null-modem cable, female to female, 25 ft 7.6 m

Black Box Corporation

Black Box Corporation DB9 Serial Null-Modem Cable Female/Female 25-ft 7.6-m

SKU CH-GNF9-DNQAD

Null-modem cable with DB9 female connectors on both ends, 25 ft (7.6 m) long

  • 25-foot length connects equipment across server racks
  • 6-metre cable reaches distant serial ports without extension
  • DB9 female-to-female ends link two DTE devices directly
  • Null-modem wiring crosses transmit and receive lines for data transfer
  • Black Box construction delivers reliable serial connectivity for data centres

DB9 Serial Null-Modem Cable 25-ft

This Black Box Corporation cable connects two DB9 female ports in a null-modem configuration for direct serial communication. It spans 25 feet (7.6 m) and is built with high-performance copper for structured cabling systems, data centres, industrial environments and multimedia installations. The product is supplied new and intended for permanent or semi-permanent wiring runs.

Installation and common issues

The cable plugs straight into standard DB9 female connectors without tools or drivers, making physical installation straightforward. The main risk is mismatching the null-modem wiring to the application; a straight-through cable will not work where a null-modem is required, and vice versa. Verify the pin-out needed by both devices before fitting the cable to avoid communication failures.

25-ft length decides fit

The 25-foot (7.6 m) reach is the single specification that determines whether this cable suits the installation. Runs shorter than this will leave excess slack, while longer runs demand a different length or an extender. Buyers needing a shorter patch cable or a longer trunk run should select a different length to match the exact distance between ports.

Highlights

  • 25-foot length connects equipment across server racks
  • 6-metre cable reaches distant serial ports without extension
  • DB9 female-to-female ends link two DTE devices directly
  • Null-modem wiring crosses transmit and receive lines for data transfer
  • Black Box construction delivers reliable serial connectivity for data centres

Specifications

No published specifications for this item yet.

Questions about this item

How can I confirm the 25-ft null-modem cable is passing data correctly after connecting two DB9 ports?

Connect the cable between two serial devices, open a terminal program on each end, and verify that characters typed on one side appear on the other without errors.

What does the 7.6-m DB9 female-to-female null-modem cable include, and are gender changers or adapters required separately?

The package contains the 25-ft cable with DB9 female connectors on both ends; no additional gender changers or adapters are included.

Should I choose the 25-ft length or a shorter version for a direct PC-to-PC serial link?

Select the 25-ft cable when the two DB9 ports are up to 7.6 m apart; choose a shorter cable only if the distance is less and you want less slack.

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