9pin D sub to 7 pin DIN

MarkT:
7-pin DIN sounds unlikely - what was this connected to ?

It is a 7-pin Din with the 7 pins in an arc. It is as serial out on a weighing computer. I would like to send the data from there to the pc to get the data easy.

But now the question, how to connect the wires? Is it just the Rx,Tx and Ground?