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 RS232C Serial Cross Cable 2m Black D-Sub 9pin Female/Female SCNM9FF2MBK

StarTech.com RS232C Serial Cross Cable 2m Black D-Sub 9pin Female/Female SCNM9FF2MBK

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
Connector Type
HDMI
Cable Type
Serial
Compatible Devices
Modem
Special Feature
Tangle Free

📏2m Length

🔌Molded Strain Relief Connectors

🛡️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

🔗 Stay Connected, Stay Ahead with StarTech’s Shielded Serial Cable

OPTIMAL LENGTH - 2 meters of flexible, round cable for versatile setups
UNIVERSAL COMPATIBILITY - Works seamlessly with modems and serial devices
DURABLE MOLDED CONNECTORS - Strain relief design ensures long-lasting, tangle-free use
SLEEK PROFESSIONAL DESIGN - Matte black finish fits perfectly in any tech-savvy workspace
INTERFERENCE FREE CONNECTIVITY - Premium shielding blocks EMI for flawless data transfer

The StarTech.com RS232C Serial Cross Cable (2m) features high-quality EMI shielding and molded strain relief connectors, ensuring reliable, tangle-free serial communication for modems and other devices. Its durable, professional-grade design and optimal length make it a must-have for tech professionals demanding seamless connectivity.

Specifications

Connector Gender	Male-to-Female
Compatible Devices	Modem
Color Name	Black
Item Shape	Round
Batteries Included	No
Batteries Required	No
Brand	StarTech.com(スターテック)
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	2 m
Cable Type	Serial
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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