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Grey 25 ft serial cable with DB9 female connectors at both ends

STARTECH

STARTECH SCNM9FF25 serial cable 25 ft DB9 female to female

SKU CH-NZF1-W3C1B MPN SCNM9FF25

25 ft cross-wired null modem cable with DB9 female connectors for direct serial port links or PC-to-PC file transfer

  • Connector count2
  • Connector detailsConnector A 1 - DB9 Female Connector B 1 - DB9 Female
  • Connector genderFemale to Female
  • Product typeCable Connectors
  • Product colorGray
  • Overall length25 ft (7.62 m)

Length 25 ft.

Style Null Modem Cable Female to Female

  • 25 ft length spans distant serial ports
  • Cross-wired null modem links two DB9 ports directly
  • Female-to-female connectors mate with standard male serial ports
  • Two DB9 ends enable PC-to-PC file transfer
  • Grey jacket identifies the cable in crowded racks

StarTech 25 ft Null Modem Cable

The StarTech SCNM9FF25 is a 25 ft cross-wired serial cable with DB9 female connectors at both ends. It is built for technicians and integrators who need a direct null-modem link between two DTE devices such as legacy PCs, industrial controllers or network gear.

Cross-wired DB9 female-to-female pinout

The cable uses a null-modem wiring scheme so transmit and receive lines are swapped internally. This pinout is the single specification that determines compatibility; it will not work as a straight-through extension for a modem or other DCE equipment.

Simple plug-in installation

Each end mates with a standard DB9 male port and uses thumbscrews for a secure fit. The main installation issue is accidentally using a straight-through cable when a null-modem link is required, which results in no data flow.

How it compares

Measured against everything we stock in RS-232 Serial Cables, at today’s prices. Recalculated every night.

Price $13.99
Cheaper than about 76% of the 93 comparable items (median $21.99).

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Specifications

Product
Brand nameStarTech.com
Model nameSCNM9FF25
Product typeCable Connectors
Product colorGray
Ports & slots
Connector count2
Connector detailsConnector A 1 - DB9 Female
Connector B 1 - DB9 Female
Connector genderFemale to Female
Size & build
Overall length25 ft (7.62 m)
Shipping weight0.30 kg
Package size166 × 155 × 46 mm

Other versions of this model

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Questions about this item

What does the 25 ft length mean for a serial cable in a real setup?

The 25 ft length gives you enough reach to link two DB9 serial ports across a desk or rack without needing an extender.

How does the cross-wired null modem wiring affect the DB9 female connectors?

The cross-wired design connects transmit to receive on each end, so two DTE devices such as PCs can communicate directly without a modem.

What do the two DB9 female connectors require to mount or fit?

Each DB9 female connector mates with a standard 9-pin male serial port and uses thumb screws to secure the connection.

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