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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⚡ Stay connected, stay ahead — the serial cable that means business.

DURABLE PVC JACKET - Rugged polyvinyl chloride outer layer ensures longevity and tangle-free use.
VERSATILE 2 METER LENGTH - Generous cable length for flexible indoor or outdoor setups without compromise.
PLUG PLAY COMPATIBILITY - Works flawlessly with PCs, modems, and other serial devices—no hassle, just connect.
BLAZING FAST DATA TRANSFER - Experience up to 6.6 Gbps speeds—because slow connections are so last decade.
SEAMLESS SERIAL CONNECTIVITY - Effortlessly link your legacy devices with reliable DB9 female-to-female ports.

The StarTech.com 2m Black DB9 RS232 Serial Null Modem Cable features a 9-pin female-to-female design optimized for high-speed 6.6 Gbps data transfer. Its durable PVC jacket and versatile 2-meter length make it ideal for both indoor and outdoor serial device connections, ensuring reliable performance with PCs, modems, and other compatible hardware.

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Number of Items	1
Item Weight	0.11 Kilograms
Unit Count	1.0 Count
Shape	Round
Color	Black
Indoor Outdoor Usage	Outdoor, Indoor
Recommended Uses For Product	data transfer
Data Transfer Rate	6.6 Gigabits Per Second
Number of Pins	9
Connectivity Technology	Serial
Gauge	28.0
Additional Features	Data Transfer
Connector Gender	Female-to-Female
Connector Type Used on Cable	Serial
Cable Type	Serial
Compatible Devices	PC, Modem
Outer Material	Polyvinyl Chloride (PVC)

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)

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