Lifedrive serial port

[Eliel]

Hello I would like to know if someone has experience connecting a serial device to the Lifedrive rs232 port... I have done this:
[IIIIIIIIIIIII]      [III]
1       13   14  16

[IIIIIIXIIYIII] [III]
X=GND
Y=RX
If this is the LD connector pin number 10 for RX and pin number 7 for GND, that is working but where is the TX port??

we are trying to connect a TH-D7A radio TNC port...

Thanks in advance.