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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TANGLE FREE DESIGN - Say goodbye to messy cables with our innovative tangle-free feature.
SEAMLESS CONNECTIVITY - Effortlessly connect your serial devices with this 2m DB9 female-to-female cable.
LIGHTWEIGHT PORTABLE - At just 114 grams, this cable is easy to carry and store, ideal for on-the-go setups.
VERSATILE COMPATIBILITY - Perfect for a variety of serial devices, making it a must-have for tech-savvy professionals.
INTERFERENCE FREE TRANSFERS - High-quality shielding ensures your data transfers are smooth and uninterrupted.

The StarTech.com 2m Black DB9 RS232 Serial Null Modem Cable is a high-quality, female-to-female connection solution designed for seamless data transfer between serial devices. With its robust shielding and tangle-free design, this cable ensures reliable performance and easy handling, making it an essential tool for professionals in need of efficient connectivity.

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Manufacturer	StarTech.com
Part number	SCNM9FF2MBK
Item Weight	114 g
Product Dimensions	199.9 x 3.3 x 1.52 cm; 114 Grams
Item model number	SCNM9FF2MBK
Size	6 ft/2 m
Colour	Black
Style	Single
Shape	Round
Voltage	240 Volts
Item Package Quantity	1
Special Features	Tangle Free
Batteries included?	No
Batteries Required?	No

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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