----------
\1      5/
 \6    9/
  ------

1- (CD)  Carrier detect
2- (RD)  Receive data
3- (TD)  Transmit data
4- (DTR) Data terminal ready
5- (SGN) Signal ground
6- (DSR) Data set ready
7- (RTS) Request to send
8- (CTS) Clear to send
9- (RI)  Ring indicator