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 2m DB9 RS232 Serial Null Modem Cable, Black (SCNM9FF2MBK)

Product ID: 27706076

Details

Brand
StarTech.com
Cable Type
Serial
Compatible Devices
Modem PC
Connector Type
Serial
Special Feature
Data Transfer

📏2m length for versatile setups

🔌DB9 female-to-female connectors

🛡️EMI shielding for interference-free transfer

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Description

🔗 Connect Like a Pro, Transfer Like a Boss!

OPTIMIZED 2 METER LENGTH - Perfect cable length for flexible workspace and device placement without clutter.
PLUG AND PLAY SIMPLICITY - No drivers needed—just connect and start transferring files between PCs or serial devices instantly.
LIFETIME WARRANTY ASSURANCE - Backed by StarTech.com's lifetime warranty for dependable, long-term use.
SEAMLESS SERIAL CONNECTIVITY - Effortlessly link your serial devices with reliable DB9 female-to-female connectors.
EMI SHIELDING FOR CRYSTAL CLEAR DATA - Aluminum-Mylar foil shielding ensures your data transfers stay interference-free and secure.

The StarTech.com 2m Black DB9 RS232 Serial Null Modem Cable (SCNM9FF2MBK) is a high-quality, 9-pin female-to-female serial cable designed for reliable PC-to-PC or device serial connections. Featuring robust EMI shielding and molded connectors with strain relief, it guarantees interference-free data transfer. With a versatile 2-meter length and backed by a lifetime warranty, this cable is a trusted choice for professionals needing dependable serial communication.

Specifications

ASIN	B00QM8ZPZ4
Best Sellers Rank	#10 in Modem Cables
Brand Name	StarTech.com
Cable Type	Serial
Color	Black
Compatible Devices	Modem, PC
Compatible Phone Models	No Compatible Phone Models
Connectivity Technology	Serial
Connector Gender	Female-to-Female
Connector Type	Serial
Customer Package Type	Standard Packaging
Customer Reviews	4.5 4.5 out of 5 stars (930)
Gauge	28.0
Global Trade Identification Number	00065030859585
Included Components	1 - 2m Black DB9 RS232 Serial Null Modem Cable F/F
Indoor Outdoor Usage	Indoor, Outdoor
Item Length	6.6 Feet
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	Data Transfer
Outer Material	Polyvinyl Chloride (PVC)
Part Number	SCNM9FF2MBK
Recommended Uses For Product	data transfer
UPC	065030859585
Unit Count	1.0 Count
Warranty Description	Lifetime

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$32.31

Duties & taxes included

In stock

Sold byAmazon EcuadorDelivered 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 Ecuador.

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TrustScore 4.5 | 7,300+ reviews

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