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

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.

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.

What is the gage of the conductor wire?

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

2m Black Db9 Null Modem Cable

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

🔗 Connect like a pro—stay linked, stay ahead!

PREMIUM BUILD QUALITY - Durable black outer casing ensures longevity and consistent performance.
OPTIMAL 2 METER LENGTH - Perfect balance between reach and minimal signal loss for desktop or rack environments.
PLUG PLAY SIMPLICITY - No drivers needed—just connect and power your communication instantly.
TRUSTED BY PROFESSIONALS - StarTech’s 4.6-star rating from 893 users guarantees dependable performance.
SEAMLESS SERIAL CONNECTIVITY - Effortlessly link legacy devices with modern setups using reliable RS232 protocol.

The StarTech 2m Black DB9 Null Modem Cable (SCNM9FF2MBK) is a high-quality, 9-pin female-to-female RS232 serial cable designed for seamless modem and legacy device connectivity. Made in the USA with durable materials, it offers a perfect 2-meter length for flexible indoor setups and is backed by excellent user reviews, making it a trusted choice for professionals needing reliable serial communication.

Reviews

Y**O

Good quality serial cable

Totally happy with this, it works fine. Build quality seems good.

18.12.2023

K**.

It Works

It's a cable, it fits, it works, it is flexible, and seems to be of decent quality.

19.12.2025

B**X

Ótimo produto mas...

Produto muito bom, porem pesquisando é possivel encontrar preço mais competitivo

17.04.2026

H**T

Buen producto.

Excelente producto, el cable es muy flexible y comodo de almacenar.

21.09.2020

C**N

Bon produit

Conforme

25.07.2025

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