On Wed, Feb 05, 2003 at 01:54:44PM +0100, netbsd@libkvm.org wrote:
>                  TIOCM_ST   Secondary Transmit.
>                  TIOCM_SR   Secondary Receive.
> 
> these appear on a cable DB25 to connect terminals, but i'd like
> to know how are they defined on a DB9 cable? are they simply
> TX/RX?

They are not defined on a DB9 cable:

http://easysw.com/~mike/serial/serial.html#6_3

Cheers,

Ben