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

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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

Product ID: 365987472

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Details

Brand
StarTech
Connector Type
RS232
Cable Type
Serial
Compatible Devices
Modem
Recommended Uses For Product
Connecting to

⚡6.6 Gbps ultra-fast data transfer

🔌2m length for versatile setups

🖥️Female-to-female DB9 RS232 connectors

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

⚡ Power your legacy tech with next-level speed and style!

PLUG PLAY SIMPLICITY - No drivers, no fuss—just instant, stable connections for your critical devices.
COMPACT DURABLE DESIGN - Sleek 2-meter black round cable built to last and fit any professional workspace.
BLAZING FAST DATA TRANSFER - Experience up to 6.6 Gbps speed—because lag is so last decade.
CERTIFIED QUALITY ASSURANCE - FCC-certified and proudly made in the USA for trusted performance and compliance.
SEAMLESS SERIAL CONNECTIVITY - Effortlessly link modems and peripherals with reliable RS232 serial communication.

The 2m Black DB9 Null Modem Cable by StarTech is a high-performance RS232 serial cable designed for seamless modem and peripheral connections. Featuring female-to-female DB9 connectors, a robust 2-meter length, and an impressive 6.6 Gbps data transfer rate, this FCC-certified cable ensures reliable, lag-free communication in professional environments. Crafted in the USA with durable materials, it’s the perfect blend of classic connectivity and modern efficiency.

Specifications

Brand	StarTech
Connector Type	RS232
Cable Type	Serial
Compatible Devices	Modem
Recommended Uses For Product	Connecting to modems, serial communication with computers and peripherals
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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