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Black DB9 male-to-male null modem adapter

STARTECH

STARTECH NM9MM DB9 RS232 Null Modem Adapter M/M data adapter

SKU CH-5V4E-7FHTA MPN NM9MM

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

  • Adapter typeDB9 Gender Changer
  • Product colorBlack
  • DetailsConnector Type(s): 1 - DB-9 (9 pin; D-Sub) Male
  • Key featuresNull Modem Adapter DB9M to DB9M is used to convert a straigh
  • Product weight0.08
  • Connects two serial devices directly
  • Male-to-male DB9 null modem design
  • Converts straight-through cable to null modem
  • Compatible with SV1115IPEXGB and SV1115IPEXT
  • Lightweight at 0.08 for portable use

Null modem adapter for DB9 serial ports

This DB9 male-to-male adapter converts a standard straight-through serial cable into a null modem cable. It enables direct device-to-device communication without a modem. The compact black unit weighs 0.08 kg and installs without tools or drivers. It is built for legacy RS232 equipment that requires crossed transmit and receive lines.

Who should use this adapter

Technicians maintaining industrial controllers, networking gear or point-of-sale systems that rely on DB9 serial links will find this adapter essential. It suits installers who already own straight-through cables and need a quick gender-changing null modem solution. Buyers who require a female connector, a different pin count or a USB interface should look at other products.

Critical specification: DB9 male-to-male null modem

The defining feature is the DB9 male-to-male null modem pinout that crosses transmit and receive signals internally. This single attribute determines whether the adapter matches the serial port gender and wiring scheme of the target equipment. Verify that both connected devices present DB9 female ports and expect a null modem crossover before purchasing.

How it compares

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

Price $4.99
Cheaper than about 99% of the 354 comparable items (median $21.99).

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Specifications

Product
Brand nameStarTech.com
Model nameNM9MM
Product colorBlack
Adapter typeDB9 Gender Changer
Size & build
Cable lengthNo
Shipping weight0.03 kg
Package size86 × 72 × 18 mm

Questions about this item

How can I verify the NM9MM adapter is correctly converting my straight-through cable into a null modem link?

Connect the adapter between two DB9 male ports; a successful RS232 handshake with crossed transmit and receive lines confirms the null modem function is active.

What comes with the NM9MM and what must I supply separately?

The package includes the DB9 male-to-male null modem adapter only; you must provide the straight-through serial cable to be converted.

Which version of the NM9MM should I choose for the SV1115IPEXGB or SV1115IPEXT?

The NM9MM is the specified null modem adapter for both the SV1115IPEXGB and SV1115IPEXT part numbers.

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