I am having a hard time with this problem and hoping that someone can help me out. I have an ACME packet 4250 server that needs a console cable to access it. The box itself takes an RJ-45 in the front. Then you use a RS232 to RJ45 to connect it to your computer's serial port. Basically just like a Cisco router. The issue I am running into is the pinout of the terminal adapter does not appear to be standard.

According to Orcale (they own ACME now) they said the pin out should be this;

  • Pin 3 --> Receive Data
  • Pin 4 --> Transit Data
  • Pin 6 --> GND

When I hook up my terminal adapter in (what I think is) the right pinout I get no response from the serial port. It's stone cold dead.

I think the issue is my mis-understanding of how the adapter should be wired up. The only way I have tried to wire the adapter up is in a straight-through configuration from RJ45 to RS232, pin for pin.

Is there something I am missing? Do I need to cross pins or something?

Any help would be appreciated.


I found the manual to the server on Oracle's website. I have included the snippet of documentation that I was referencing.

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  • You might have it wired right, but might not have the baud/flow setup correctly. If you don't have the right rates/etc. you won't get a proper sync across the wire (signals won't sync up) and thus it will seem as though nothing is coming through (i.e. a dead/miswired cable) ... Can you get the baud/flow/etc. needed to serial in? – txtechhelp Jun 2 '15 at 4:34
  • according to the documentation, it's 9600bps 8N1. No flow control. – ianc1215 Jun 2 '15 at 5:05
  • Hi the Baud Rate is 115200 bps (8 data, 1 stop, no parity, no flow control) – user537212 Dec 23 '15 at 22:29
  • From cello: the Baud Rate is 115200 bps (8 data, 1 stop, no parity, no flow control) – fixer1234 Dec 24 '15 at 3:58

Manufacturing cable with the following configuration and works fine for me.

Pin Assignments: Customer Side

The following table identifies the pin assignments, color codes, and signal names/descriptions for the DigiKey RJ45 DB9 console connector adaptor in comparison to the RS232/RJ45 connector.

                    RJ45 Pin Number         DB9 Pin Number            Color

Receive Data (RXD)  6 --------------------- 2                         Yellow

Transmit Data (TXD) 3 --------------------- 3                         Black

Ground              4 --------------------- 5                         Red
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You can also use a "Blue" Cisco console cable with a Null Modem Adapter DB9M/DB9F Modem Gender Changer. Search sites like Amazon or CDW for "null modem adapter db9f db9m" the Baud Rate is 115200 bps (8 data, 1 stop, no parity, no flow control)

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  • Forgot to add that I connect the Cisco cable w/null modem adapter to my USB to Serial cable and I use Putty to connect. – Brutus Oct 21 '16 at 2:22

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