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Confused about proper pinout with an RJ45 to DB9 adapter

community.spiceworks.com › t › confused-about-proper-pinout-with-an-rj45-to-db9-adapter › 1186908

I am attempting to control a device with RS232 commands.

The device has a control box that accepts RJ45 cable.

I am sending my commands via a Global Cache iTach WF2SL device which has a DB9 serial port.

I am attempting to connect the two devices using a Cat-6 T-568B cable, and a RJ45 to DB9 adapter.

The WF2SL pinout uses 2 - RX, 3 - TX, and 5 - Ground.

The control box expects what is in the image below:

Screen-Pinout462×336 35.3 KB

The adapter has the following pinout definitions:

Adapter Diagram831×771 47.9 KB

I’ve been trying to research this to determine the correct pinout but have become pretty much completely confused at this point.

I have ensured that the WF2SL is configured with the correct baud rate and additional settings.

I have tried quite a few different combinations of pinouts with no success.

Would anyone be able to dumb this down for me, and help me get the right pinout on the adapter, using the Cat-6 cable I have, to work with what the device is expecting?

Thanks in advance.

Answer from kevinicus on community.spiceworks.com

Cable Tester

cable-tester.com › home › pin out › rj45 rs232 console cable pin out

RJ45 RS232 Console Cable Pin Out

July 1, 2023 - Serial Console Cable Pin Out Diagram (RJ45 to RS232 female cable)

Spiceworks

community.spiceworks.com › hardware & infrastructure › networking

Confused about proper pinout with an RJ45 to DB9 adapter - Networking - Spiceworks Community

Top answer

1 of 9

I am attempting to control a device with RS232 commands.

The device has a control box that accepts RJ45 cable.

I am sending my commands via a Global Cache iTach WF2SL device which has a DB9 serial port.

I am attempting to connect the two devices using a Cat-6 T-568B cable, and a RJ45 to DB9 adapter.

The WF2SL pinout uses 2 - RX, 3 - TX, and 5 - Ground.

The control box expects what is in the image below:

Screen-Pinout462×336 35.3 KB

The adapter has the following pinout definitions:

Adapter Diagram831×771 47.9 KB

I’ve been trying to research this to determine the correct pinout but have become pretty much completely confused at this point.

I have ensured that the WF2SL is configured with the correct baud rate and additional settings.

I have tried quite a few different combinations of pinouts with no success.

Would anyone be able to dumb this down for me, and help me get the right pinout on the adapter, using the Cat-6 cable I have, to work with what the device is expecting?

Thanks in advance.

2 of 9

2 to 3, 3 to 2 and 5 to 5.

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r/networking on Reddit: Pinout for serial cable with RJ45 on both sides?

December 4, 2015 -

We have a ThinkLogical Serial Console Server that I'm attempting to connect to some F5 Big IPs. Both devices have RJ45 jacks, and I'm trying to get them to talk to each other. The Big IPs came with TIA 568B to rollover adapters.

Connecting using RJ45 -> DB9 works just fine.

I've tried connections between the SCS and Big IPs with the following, in all permutations:

With and without the adapter. EDIT: Meaning with rollover and standard pinout ethernet cables.
DTE and DCE on the SCS.
Multiple baud rates on both sides.

Nothing has worked, so I can only conclude that the pinout is the problem. Does anyone know the correct pinout that I should be using? My google fu has failed me.

EDIT: Just in case someone finds this while searching for the same problem, here's the answer: my coworker accidentally used an F5 failover cable instead of standard ethernet. The failover cables have their own unique pinout, so they didn't work. The correct cable for this job is a standard rollover, or a standard ethernet cable with a rollover adapter (which is included with the Big IPs).

We also had to change our serial console server from DCE to DTE, turn off all flow control, and (obviously) match baud rates and parity on both sides. The Big IPs default is 19200 8N1.