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

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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)

Product ID: 269628098

Details

Brand
StarTech
Cable type
Serial
Compatible devices
Modem PC
Connector type
Serial
Special features
Tangle Free

📏2 meters length for versatile setups

🔌DB9 Female-to-Female connectors

🛡️High-quality shielding blocks EMI interference

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Description

🔗 Connect like a pro — never miss a byte!

TANGLE FREE DESIGN - Smooth PVC jacket keeps your workspace neat and hassle-free.
LIFETIME CONFIDENCE - Backed by StarTech’s lifetime warranty for worry-free, long-term use.
SEAMLESS SERIAL SYNC - Effortlessly connect and transfer data between serial devices with a reliable 2m cable.
PLUG PLAY PRECISION - DB9 female-to-female connectors ensure instant compatibility with your legacy hardware.
INTERFERENCE FREE PERFORMANCE - Premium shielding guarantees stable data flow without signal disruption.

The StarTech 2m Black DB9 RS232 Serial Null Modem Cable features dual female DB9 connectors and robust EMI shielding, enabling reliable serial data transfer between PCs and modems. Its tangle-free PVC design and lifetime warranty make it a trusted choice for professionals needing seamless legacy device connectivity.

Specifications

ASIN	B00QM8ZPZ4
Best Sellers Rank	#32,775 in Computers ( See Top 100 in Computers ) #3 in Modem Cables
Brand Name	StarTech
Cable Type	Serial
Color	Black
Compatible Devices	Modem, PC
Compatible Phone Models	Not compatible phone models
Connectivity Technology	Serial Port
Connector Gender	Female-to-Female
Connector Type	Serial
Country Of Origin	China
Customer Package Type	Standard Packaging
Customer Reviews	4.5 4.5 out of 5 stars (1,463)
Ethernet Cable Category	Cat 5
Global Trade Identification Number	00065030859585
Indoor Outdoor Usage	Indoor
Item Length	2 Meters
Item Part Number	SCNM9FF2MBK
Item Shape	Round
Item Type Name	Data Transfer Cable
Item Weight	0.11 Kilograms
Manufacturer	StarTech.com
Model	SCNM9FF2MBK
Model Name	SCNM9FF2MBK
Number of Items	1
Number of Pins	9
Other Special Features of the Product	Tangle Free
Outer Material	Polyvinyl Chloride (PVC)
Part Number	SCNM9FF2MBK
Recommended Uses For Product	Pc
UPC	065030859585
Unit Count	1 Count

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€ 26.30

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Cyprus.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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