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Small black DB9 female-to-female null modem adapter

STARTECH

STARTECH NM9FF DB9 RS232 Null Modem Adapter F/F data adapter

SKU CH-JACH-FY24Q MPN NM9FF

Connects two DB9 female serial ports as a null modem for direct RS232 communication

  • ColorBlack
  • Cable LengthNo
  • Changer TypeDB9 Gender Changer
  • SpecificationsConnector Types: 1 - DB9 Female Connector Types: 1 - DB9 Fem
  • Weight0.08
  • DB9 female-to-female null modem links two serial ports directly
  • Null modem wiring crosses transmit and receive lines for straight-through data exchange
  • Female DB9 connectors on both ends accept standard male serial cables
  • Compatible with PCI2S232485I and PCI8S950LP serial controller cards
  • Weighs only 0.08 units for minimal strain on ports

DB9 Female-to-Female Null Modem Adapter

This DB9 null modem adapter connects two female serial ports directly for RS-232 communication. It crosses transmit and receive lines so data flows between two DTE devices without a modem. The compact gender changer suits legacy equipment and industrial links that still use DB9 connectors.

IT Professionals Maintaining Serial Infrastructure

Technicians who need a quick F/F null modem crossover for testing, commissioning or permanent installs will find this adapter fits the task. Buyers who require a male-to-female or male-to-male pinout, or who need a longer cable assembly instead of a short gender changer, should look at a different product.

DB9 Female Connector on Both Ends

The adapter presents a DB9 female socket at each end, providing the straight mechanical mate for two male DB9 plugs. This single connector specification decides whether the part matches the ports on your hardware.

Highlights

  • DB9 female-to-female null modem links two serial ports directly
  • Null modem wiring crosses transmit and receive lines for straight-through data exchange
  • Female DB9 connectors on both ends accept standard male serial cables
  • Compatible with PCI2S232485I and PCI8S950LP serial controller cards
  • Weighs only 0.08 units for minimal strain on ports

Specifications

BrandStarTech.com
ModelNM9FF
ColorBlack
Cable LengthNo
Changer TypeDB9 Gender Changer
SpecificationsConnector Types: 1 - DB9 Female
Connector Types: 1 - DB9 Female
Weight0.08
Shipping weight0.04 kg
Package size95 × 86 × 19 mm

Questions about this item

Will the DB9 female connectors need any maintenance or replacement over time?

The adapter has no moving parts or active components, so the DB9 female connectors require no scheduled maintenance or replacement under normal use.

What limit appears first when the null modem adapter runs continuously?

The passive design means signal integrity over the RS232 link is the first practical limit, not thermal or power constraints.

Does the adapter generate any noise, heat or draw extra power when left connected all day?

It draws no external power, produces no audible noise and adds negligible heat because it is a simple passive wiring adapter.

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