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Black DB9 male-to-female null modem adapter

STARTECH

STARTECH NM9MF Null Modem Adapter DB9 Male to DB9 Female

SKU CH-EE2W-DX63R MPN NM9MF

Converts a straight-through serial cable into a null modem link with a DB9 male-to-female connection

  • Adapter typeDB9 Male to DB9 Female
  • Product colorBlack
  • Key featuresNull Modem Adapter DB9 Male to DB9 Female is used to convert
  • Product weight0.08
  • Null modem adapter converts a straight-through cable into a null modem cable
  • DB9 male to DB9 female connector enables direct serial device connections
  • Compact black design weighs only .08 for easy integration
  • Compatible with PCI2S232485I serial cards for expanded connectivity
  • Works with PCI8S950LP and SV1115IPEXGB multi-port serial adapters

Null Modem Adapter DB9 Male to Female

This DB9 male-to-female adapter converts a standard straight-through serial cable into a null modem link for direct device-to-device communication. It suits technicians and engineers working with legacy RS-232 equipment such as industrial controllers, point-of-sale hardware or older networking gear.

Passive design requires no external power

The adapter operates without a power supply, drawing no current and adding no audible noise to the installation. Its passive wiring simply crosses the transmit and receive lines so connected equipment can exchange data immediately.

Supports StarTech multi-port serial cards

The accessory is validated for use with part numbers PCI2S232485I, PCI8S950LP and SV1115IPEXGB, letting installers adapt existing straight-through cabling for those controller boards. No additional drivers or configuration software are required.

How it compares

Measured against everything we stock in Interface & Card Adapters, at today’s prices. Recalculated every night.

Price $6.99
Cheaper than about 97% of the 354 comparable items (median $21.99).

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Specifications

Product
Brand nameStarTech.com
Model nameNM9MF
Product colorBlack
Adapter typeDB9 Male to DB9 Female
Size & build
Cable lengthNo
Shipping weight0.02 kg
Package size86 × 66 × 18 mm

Questions about this item

How do I install the NM9MF between my serial cable and the DB9 port, and what is the common mistake?

Plug the male DB9 end of the adapter into the female port on your device, then connect your straight-through serial cable to the adapter's female DB9 end. The common mistake is using a null-modem cable instead of a straight-through cable, which reverses the signals again and breaks the link.

What maintenance or replacement will the NM9MF need over time?

The adapter has no moving parts and requires no scheduled maintenance. Replace it only if the DB9 pins bend, the housing cracks, or intermittent connections appear after repeated mating cycles.

What limit appears first when the NM9MF is used continuously at high serial speeds?

The practical limit is the RS-232 voltage swing and cable capacitance; the adapter itself adds no active circuitry, so sustained throughput is bounded by the serial port's maximum baud rate and the cable length rather than the adapter.

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