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

2m Black DB9 Null Modem Cable

Q: 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.

Q: 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.

Q: What is the gage of the conductor wire?

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

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Product ID: 365987472

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Details

Brand
StarTech.com
Connector Type
RS232
Compatible Devices
Modem
Colour
Black
Connector Gender

⚡6.6 Gbps Speed

🌍FCC Certified

🔌RS232 Connector

Frequently Bought Together

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)

SABRENT USB 2.0 to Serial (9 Pin) DB 9 RS 232 Converter Cable, Prolific Chipset, HEXNUTS, [Windows 11/10/8.1/8/7/VISTA/XP, Mac OS X 10.6 and Above] 2.5 Feet (CB-DB9P)

StarTech.com 10' RS232 Serial Null Modem Cable - Null modem cable - DB-9 (F) to DB-9 (F) - 10 ft (SCNM9FF)

Description

🔗 Connect with Confidence!

SLEEK STYLISH - The elegant black finish not only looks professional but also fits seamlessly into any tech setup.
ROBUST RELIABLE - Constructed with high-quality materials, this cable is built to last, ensuring consistent performance.
SEAMLESS COMPATIBILITY - Designed for modems, this cable guarantees a flawless connection with your devices.
PROUDLY MADE IN THE USA - Support local craftsmanship with a product that meets the highest standards.
UNLEASH LIGHTNING FAST DATA - Experience data transfer rates of up to 6.6 Gbps, ensuring your connectivity is always ahead of the curve.

The StarTech.com 2m Black DB9 Null Modem Cable (SCNM9FF2MBK) is a high-performance, female-to-female RS232 connector cable designed for seamless modem connectivity. With a data transfer rate of 6.6 Gbps and FCC certification, this cable ensures reliable and efficient communication for your devices. Weighing just 114 grams and featuring a sleek black design, it’s the perfect addition to any professional setup.

Specifications

Brand	StarTech.com
Connector Type	RS232
Compatible Devices	Modem
Colour	Black
Connector Gender	Female-to-Female
Data Transfer Rate	6.6 Gigabits Per Second
Shape	Round
Number of Pins	9
Item Weight	0.11 Kilograms
Specification Met	FCC
Outer Material	Other
Manufacturer	STARTECH.COM
UPC	065030859585
Global Trade Identification Number	00065030859585
Item Height	0.6 Inches
Item Width	1.3 Inches
Product Dimensions	199.9 x 3.3 x 1.52 cm; 114 g
Item model number	SCNM9FF2MBK
Processor Count	1
Voltage	240 Volts
Are Batteries Included	No
Included Components	Null modem cable
Country of Origin	USA
Item Weight	114 g

Have a Question? See What Others Asked

What is the pin out?

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?

What is the wire diagram of these cables

What is the gage of the conductor wire?

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