Thankfully as time has passed, those have gotten a lot more standardized. It’s rare to find anything these days that isn’t the Cisco pinout. Most new stuff is just USB which is even better. But vendors who use USB connectors without putting USB on the port annoy the crap out of me. Answer from cyberentomology on reddit.com
StarTech.com
startech.com › home › cables › serial cables, parallel cables & ps/2 cables › db9 cables & db25 cables › gc98ff
DB9 to RJ45 Modular Adapter - F/F | Serial Adapters
DB9 to RJ45 Modular Adapter - F/F
DB9 to RJ45 Modular Adapter - F/F
Price $8.19
Antaira
antaira.com › products › CB-RJ45-DB9M-90
RJ45 to DB9 Male Serial Cable - 90cm | Antaira
RJ45 to DB9 Male Serial Cable - 90cm | Antaira · To request more information regarding our products, please fill out the following online form and a customer service representative will contact you immediately. Fields marked (*) are required. Thank you
Better DB-9 to RJ-45 solutions?
Thankfully as time has passed, those have gotten a lot more standardized. It’s rare to find anything these days that isn’t the Cisco pinout. Most new stuff is just USB which is even better. But vendors who use USB connectors without putting USB on the port annoy the crap out of me. More on reddit.com
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August 27, 2023Is there any reason to buy a RJ45 > DB9 console cable and separate USB adapter as opposed to a RJ45 > USB cable?
Just make sure whatever you get has an FTDI chip. More on reddit.com
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May 23, 2020DB9 to RJ45 to USB via coupler
You have to configure most RJ45-to-DE9 adapters yourself, so you should be able to get it working. You need to know the RJ45 pinout of your USB-to-RJ45 adapter, as well as the pinout of the DE9 connector on your switch, so you know how to configure the adapter. Do the work on paper, so you know what pin is supposed to connect to what. Before you push the terminals into the DE9 socket (which is rather permanent, unless you have the re-pinning tool) you might try temporarily connecting the loose pin connectors directly to the switch, to see if you get communication. Then plug them into the DE9 socket, and close it up. If you have multiple switches with multiple DE9s and you find that it doesn't work on one of them, then get a second adapter and wire it up for that switch. Then, mark each adapter, so that you know which one works with each switch. More on reddit.com
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May 1, 2022DB9 to RJ45 serial connect to switch - correct pinout?
This pinout worked for me: RJ45 -> DB9 RTS 1 -> 8 CTS DTR 2 -> 6 DSR TXD 3 -> 2 RXD GND 4 -> 5 GND GND 5 -> 5 GND RXD 6 -> 3 TXD DSR 7 -> 4 DTR CTS 8 -> 7 RTS IIRC, I had to leave one of the ground pins unplugged. http://i.imgur.com/O3RRKQC.jpg *Edit: Here's another picture for clarity. Also, you can push the pins back out with something like a small flathead screwdriver (~1mm). http://i.imgur.com/7hWniXb.jpg More on reddit.com
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July 27, 2017Videos
02:06
DIY Cisco RJ45 DB9 console cable - YouTube
07:37
How to make the Ethernet to Serial communication cable for the ...
02:21
StarTech.com DB9 to RJ45 Modular Adapter - F/F - Serial adapter ...
01:07
Understanding DB9 and RJ45 Connector Pinouts and Wiring Standards
08:27
RS232 DB9 Termination + Testing - Step-by-Step Guide - YouTube
Hacer cable RJ45 a RJ45 y DB9 a DB9
Reddit
reddit.com › r/networking › better db-9 to rj-45 solutions?
r/networking on Reddit: Better DB-9 to RJ-45 solutions?
August 27, 2023 -
Probably like many, I've got a stack of these DIY DB-9 to RJ-45 adapters for console access because every manufacturer is special and needs their own unique pinout to accomplish basic serial communication.... Worked well enough with my Toughbook CF-19, but need another serial extension cable to fit in the flush DB-9 ports on things like my Dell Latitude Rugged laptop and CF-20 tablet.
Cleaning/reorganizing my tool bag today, looking at these things, and curious if there's a better mousetrap out there? I know could just pick up a generic premolded RJ45 female to DB-9 adapter, then make custom CAT5 cables to match, but that would take up a lot more room in the tool bag too.
Would be great if someone made something similar to these custom adapters but with a molded DB-9 end, or maybe something like a RJ-45 coupler that could be repinned, so I wouldn't have to carry a bunch of bulky cables.
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Thankfully as time has passed, those have gotten a lot more standardized. It’s rare to find anything these days that isn’t the Cisco pinout. Most new stuff is just USB which is even better. But vendors who use USB connectors without putting USB on the port annoy the crap out of me.
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Just wish everything was RJ45 or USB-C lll
US Converters
usconverters.com › db9-rj45-adapter
DB9 to RJ45 | RJ45 to Serial converter | RJ45 serial adapter
Use this DB9 to RJ45 adapter, also called a rs232 to rj45 converter or simply a rj45 serial adapter, to convert any standard 9-pin DB port to a standard RJ45 port. These modular adapters comes unassambled and are not functional until they are assembled.
Amazon
amazon.com › RS232-Serial-Female-Ethernet-Console › dp › B01M9COPMA
Amazon.com: LFHUKEJI RJ45 to DB9, DB9 9-Pin Serial Port Male to RJ45 Cat5 Ethernet LAN Console Cable 9.8Ft : Electronics
LANMINGLEL RJ45 to DB9 Cable RJ45 Male to DB9 9-Pin Female RS232 Serial Port Cat5 Ethernet LAN Console Cable RJ45 to RS232 Networking Devices Console Cable for Routers, Switches 0.5M
Digi International
digi.com › support › knowledge-base › using-an-rj45-adapter-to-connect-to-a-db9-connecto
Using an RJ45 Adapter to Connect to a DB9 Connector | Digi International
January 1, 2024 - Select your product for firmware, drivers, software, knowledge base articles and manuals · An example application for these adapters would be to extend the RS232 serial connection so that the radio modem might be located closer to the antenna location so that the antenna cable will be as short ...
Amazon
amazon.com › ANMBEST-Ethernet-Adapter-Modular-Converter › dp › B0CBJYM9FZ
Amazon.com: ANMBEST 10PCS DB9 Female Ethernet Adapter, 9 Pin Serial Port Female to RJ45 Ethernet LAN Extend Modular Converter, F/F : Electronics
DTECH RS232 DB9 to RJ45 Serial Adapter DB-9 Female/Male to RJ-45 Female Ethernet Converter (2 Pack)
SF Cable
sfcable.com › db9-female-to-rj45-modular-adapter-color-black.html
Buy DB9 Female to RJ45 Modular Adapter Color Black Online | SF Cable
DB9 Female to RJ45 Modular Adapter Color Black
This modular adapter has a DB9 Female connector that plugs into DB9 RS232 serial port and converts it to an RJ45 connection.
RJ45 Pinout: ·
Pin1 -- Blue ·
Pin2 -- Orange ·
Pin3 -- Black ·
Pin4 -- Red ·
Pin5 -- Green ·
Pin6 -- Yellow ·
Pin7 -- Brown ·
Pin8 -- White ·
Gold plated pin
28AWG wire
Molded adapter
Thumb screw · Black color ·
Price $1.54
Amazon
amazon.com › db9-rj45 › s
Amazon.com: Db9 To Rj45
Connect your serial devices with DB9 to RJ45 adapters. Explore console cables and modular connectors for network equipment configuration and management.
Amazon
amazon.com › db9-rj45-adapter › s
Amazon.com: Db9 To Rj45 Adapter
DTECH RS232 DB9 to RJ45 Serial Adapter DB-9 Female/Male to RJ-45 Female Ethernet Converter (2 Pack) · DTECH DB9 to RJ45 Console Cable Cisco Device Management Serial Adapter 72-3383-01 CAB-CONSOLE-RJ45 (6 Feet, Blue) · XMSJSIY DB9 RS232 to RJ45 Extender, DB9 9-Pin Serial Port Female&Male to ...
Juniper Networks
juniper.net › documentation › us › en › hardware › mx2020 › srx4600 › topics › concept › port-rj45-db9-adapter-pinout.html
RJ-45 to DB-9 Serial Port Adapter Pinout Information | Juniper Networks
The console port on a Juniper Networks ... pin and you want to connect your laptop or desktop PC to the device, use a combination of the RJ-45 to DB-9 socket adapter along with a USB to DB-9 plug adapter....
Legrand AV
legrandav.com › products › cables_and_connectivity › pc_cables › rj45-to-db9-male-serial-rs232-modular-adapter › cg02945
Legrand AV | C2G CG02945 RJ45 to DB9 Male Serial RS232 Modular Adapter - Gray
Explore C2G CG02945 RJ45 to DB9 male RS232 modular adapter - color-coded parts assemble to match your wiring. Discover more.
Westward Sales
westwardsales.com › home › antaira › cb-rj45-db9m serial cable, rj45 to db9 male, 30/90 cm length
CB-RJ45-DB9M Serial Cable, RJ45 to DB9 Male, 30/90 cm Length
CB-RJ45-DB9M Serial Cable, RJ45 to DB9 Male, 30/90 cm Length
CB-RJ45-DB9M RJ45 to DB9 Male Serial Cable, 30/90 cm
The CB-RJ45-DB9M is a serial straight-through cable that converts an RJ45 to a DB9 (male) connector. It is 30 or 90 cm (11.8 or 35.4 inches) in length. The cable is constructed from UTP CAT5e with 24 AWG gauge wires. The molded DB9 features locking screws for a secure, stable connection.
The CB-RJ45-DB9F is an optional cable accessory for the Antaira STE-708 and STE-716 industrial Serial-to-Ethernet device servers.
Price $11.00
SeaLINK
sealevel.com › home › products › accessories › basic adapters & converters › db9f to rj45 modular adapter (rs-232) for seai/o (blue)
DB9F to RJ45 Modular Adapter (RS-232) for SeaI/O (Blue) - Sealevel Systems, Inc
The DB109 is a DB9F to RJ45 adapter that has a DB-9 female connector that plugs directly into any standard DB-9 RS-232 serial port and converts it to an RJ45 connection. The DB109 is designed to easily connect SeaI/O RS-232 devices to any standard ...
Infinite Cables
infinitecables.com › adapters & connectors › adapters › modular adapters › rj45 female to db9 male modular adapter - black
RJ45 Female to DB9 Male Modular Adapter - Black
RJ45 Female to DB9 Male Modular Adapter - Black
This modular adapter has a DB9 male connector on one end and a RJ45 female connector on the other. It converts a DB9 RS232, RS422 and RS485 serial port to an RJ45 connection. This adapter comes unpinned for custom pin out configuration.
Physical Characteristics
Color
Black
DB9 Connector Plating
Nickel
Contacts
Gold
Connector(s)
DB9
Male
RJ45
Female
Environmental
RoHS
Compliant
Packaging Information
Product Weight
0.05 lbs [0.02 kg]
Spec Sheets
Download attachment
Price CA$1.55
WTI
wti.com › products › dx9m-rj-kit-db9-to-rj45-adapter-kit
DX9M-RJ-KIT DB9 to RJ45 Adapter Kit | WTI - Western Telematic, Inc.
DB-9M NULL to 4" (10.2 cm) RJ45 Adapter
Draper
draperinc.com › windowshades › productdetailmotors.aspx
DB9 to RJ45 Adapter for RS485 :: Draper, Inc.
The DB9 to RJ45 Adapter for RS485 converts a 9-pin DB connector into an RJ45 jack, enabling RS485 device control.
Snap One
snapav.com › shop › en › snapav › binary-trade-db9-male-to-rj45-modular-adapter
Wirepath™ DB9 Male to RJ45 Modular Adapter
Connecting RS-232 equipment to ... neater by using these DB9-RJ45 adapters. Just make up a custom length network cable using Cat5e/6, then put an adapter on each end to convert from RJ45 to the appropriate gender DB9 connector....
ComponentsTree
componentstree.com › home › gadgets › db9 to rj45 serial adapter rs232 female to rj45 female ethernet converter
DB9 to RJ45 Serial Adapter RS232 Female to RJ45 Female Ethernet Converter - ComponentsTree.com
April 6, 2026 - DB9 to RJ45 Serial Adapter RS232 Female to RJ45 Female Ethernet Converter. Connector A: DB9 9 Pin Female, Connector B: RJ45 8 Pin Female
Micro Connectors
microconnectors.com › modular-adapter-db9-male-to-rj45
Modular Adapter (DB9 Male to RJ45) - Micro Connectors, Inc.
Modular Adapter (DB9 Male to RJ45)
For serial printers, terminals, modems, POS and other serial equipment
Price $5.99