This came up a couple of weeks ago. Several web links.
I'm surprised your google didn't find it?

On Fri, 29 Oct 2004 04:05:52 -0700, Testbed wrote:
> I am trying to wire the following adapters to obtain a teminal
> connection to a sun utlra 60 from the serial port of a PC laptop.
[snippage]
> I have had another goodle around and found the following suggested as
> well:
>
> 25 pin 9 pin
> pin 1 GND - pin 1 GND
> pin 2 TXD - pin 3 RXD
> pin 3 RXD - pin 3 TXD

You have a typo here. 2 connections to pin 3 on 9-pin? Check your source!

> pin 4 RTS - pin 8 CTS
> pin 5 CTS - pin 7 RTS
> pin 7 gnd - pin 5 gnd
> pin 6 DSR - pin 4 DTR
> pin 20 DTR - pin 6 DSR
>
>
> Could anyone confirm for me the needed wiring to connect a DB9-Female
> (PC) to DB25-Male (Ultra 60). I am using the modular adapters that
> allow you to simply insert each pin into each numbered hold on the
> connector.
>
> Many thanks if anyone can help here. Oh and for the record the box was
> booted without a keyboard connected and can be reached via ssh/telnet
> over ethernet. I have tried minicom from linux and secureCRT from
> windows.
>
> Baud-9600
> Port-COM1
> DataBits - 8
> Parity-None
> StopBit-N
>
> Cheers,
> Luke

I usually use stock/standard adapters, esp. for testing out new stuff. I
would use standard 25-pin to 9-pin adapter, together with a null modem
adapter (either 25-pin or 9-pin), and standard cables. Why screw around.
The local Staples (business supply) were clearing this kind of stuff out
at a few bucks per... I picked up some extras. Always good to have.

--
Juhan Leemet
Logicognosis, Inc.