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

Startech Com 2m Black Db9 Rs232 Serial Null Modem Cable

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Description

🔗 Connect like a pro, transfer like a boss.

FLEXIBLE 2 METER REACH - Generous cable length for flexible workspace or server room configurations.
PLUG PLAY SIMPLICITY - No drivers or software needed—just connect and transfer with confidence.
SEAMLESS SERIAL CONNECTIVITY - Effortlessly link your legacy devices with reliable DB9 female-to-female ports.
INTERFERENCE PROOF DATA TRANSFER - Aluminum-Mylar shielding ensures your files move cleanly without signal noise.
BUILT TO LAST WITH LIFETIME WARRANTY - Invest once and enjoy guaranteed durability backed by StarTech.com.

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 ensures interference-free data transfer over a flexible 2-meter length. Backed by a lifetime warranty, this cable is a trusted choice for professionals needing dependable serial communication.

Specifications

ASIN	B00QM8ZPZ4
Best Sellers Rank	#5 in Modem Cables
Brand	StarTech.com
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	4.6 out of 5 stars 919 Reviews
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
Special Feature	Data Transfer
UPC	065030859585
Unit Count	1.0 Count
Warranty Description	Lifetime

Reviews

K**.

19.12.2025

H**H

30.01.2026

R**S

19.11.2025

J**.

19.12.2017

G**Y

10.03.2021

J**N

16.09.2025

P**N

2.02.2021

P**N

4.12.2017

Y**O

18.12.2023

B**X

17.04.2026

H**T

21.09.2020

C**N

25.07.2025

م**ة

13.07.2023

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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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