The pinout for the SCNM9FF2MBK is the following: 1-1 2-3 3-2 4-6 5-5 6-4 7-8 8-7 9-9 Shell-Shell Malcolm, StarTech.com Support

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StarTech.com SCNM9FF2MBK 9-Pin Female to Female RS232C Serial Crossover Cable, 2m Black

StarTech.com SCNM9FF2MBK 9-Pin Female to Female RS232C Serial Crossover Cable, 2m Black

Q: Bought this cable to communicate between to systems. It worked for about 20 minutes then stopped completely. Is this due to not having full handshake?

That’s going to be hard to figure out. There are two similar cables. One a straight through and the other is a reverse. If you have an Ohm meter then I would check the pin out to see if you have a break in the cable. Since there are no electrical components involved I would be inclined to suspect a solfware setting issue. So if the cable hasn’t been damaged then I would check the solftware angle first. The other issue is that you may have the wrong cable but if it was working before then software is my best guess. Null modem cable has the transmit and receive pins are cross linked. So check out your cable, they look the same, one cross linked and one straight-through.

Q: What is the wire diagram of these cables

I do not know, nor do I know how easy it could be explained here. You can google 'RS232 Serial Null cable' and get pictures and schematics of them, but even then it is confusing as none I saw seemed complete. The best way to check it, to be certain, would be to check each pin with your Ohm meter, and make a diagram that you are certain is correct for your specific cable. Sorry I wasn't more help. The application for which I needed the cable had specified this type, and it worked for me.

Q: What is the gage of the conductor wire?

The SCNM9FF2MBK has a 28 AWG. Atha, StarTech.com Support

Product ID: 742802909

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Details

Brand
StarTech
Connector Type
d sub
Compatible Devices
Modem
Special Feature
Tangle Free
Color
Black

🔌Female-to-Female 9-Pin

🧵Tangle-Free Design

🛡️EMI Shielding

Frequently Bought Together

StarTech.com 2m Black DB9 RS232 Serial Null Modem Cable F/F - DB9 Female to Female - 9 pin RS232 Null Modem Cable - 2 meter, Black (SCNM9FF2MBK)

SABRENT USB 2.0 to Serial (9 Pin) DB 9 RS 232 Converter Cable, Prolific Chipset, HEXNUTS, [Windows 11/10/8.1/8/7/VISTA/XP, Mac OS X 10.6 and Above] 2.5 Feet (CB-DB9P)

StarTech.com 10' RS232 Serial Null Modem Cable - Null modem cable - DB-9 (F) to DB-9 (F) - 10 ft (SCNM9FF)

Description

🔗 Connect like a pro—no noise, no tangles, just pure serial power!

SLEEK BLACK FINISH - Discreet, professional look that blends into any workspace
GENEROUS 2 METER LENGTH - Perfect balance of reach and flexibility for professional setups
DURABLE MOLDED CONNECTORS - Tension relief design ensures long-lasting, reliable connections
INTERFERENCE FREE CONNECTIVITY - High-quality shielding blocks EMI for crystal-clear data transfer
UNIVERSAL FEMALE TO FEMALE INTERFACE - Seamlessly connects modems and serial devices with 9-pin RS232C ports

The StarTech.com SCNM9FF2MBK is a 2-meter black RS232C serial crossover cable featuring female-to-female 9-pin connectors. Engineered with high-quality EMI shielding and molded tension relief connectors, it ensures reliable, interference-free data transmission for modems and serial devices. Its tangle-free design and professional finish make it an essential tool for seamless legacy device connectivity.

Specifications

Connector Gender	Female-to-Female
Compatible Devices	Modem
Color Name	Black
Batteries Included	No
Batteries Required	No
Brand	StarTech
Manufacturer	スターテック(STARTECH.COM)
Item Model Number	SCNM9FF2MBK
Model Year	2015
Included Components	No
Operating System	not_machine_specific
Special Features	Tangle Free
Size	2m
Product Dimensions	199.9 x 3.3 x 1.52 cm; 114 g
Item Weight	0.11 Kilograms

Have a Question? See What Others Asked

What is the pin out?

Bought this cable to communicate between to systems. It worked for about 20 minutes then stopped completely. Is this due to not having full handshake?

What is the wire diagram of these cables

What is the gage of the conductor wire?

Reviews

A**R

問題なし

ルーター設定用に買いました。問題なく使用出来ております。

6.07.2025

K**0

机の場所を取らないのが良い

細くて柔らかいので取り回しが楽です。長さも開発用で丁度良い。通信も問題ありません。仕事でシリアル通信はまだまだ現役ですが、一般的なケーブルは太く固く長く悪い意味で存在感がありますけど、このケーブルは場所を取らなくて良いです。

24.05.2025

ま**A

ジャクサイズ

ジャクサイズが合わなかった。サイズを記載して。

30.06.2025

A**ー

有効活用しています

生産工程の設備で活用しています。

2.09.2023

櫻**之

RS232Cシリアルクロス/ヌルモデムケーブルメス(DB-9/D-Sub9ピン)

気に入ってます今後ともよろしくお願いいたします。

13.01.2025

M**H

普通

何の問題もなく使える。

13.10.2024

カ**パ

オモチャのパソコンの修理

マウスケーブル（9芯）の代替品として使いましたケーブルが柔らかくて丁度良かった

16.09.2024

A**ー

不良品だった

不良品（通信できない）

3.10.2023

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