A7N8X Deluxe optical output question

I have purchased an optical output module for my A7N8X Deluxe,
but the plug on my mainboard is different from the module.

on the mainboard (same as the upper one on the pic):
1 2 3
4 5 6

on the module (same as the lower one on the pic): :
1 2 3 4

So I'm deciding to DIY a cable myself, I want to ask the definition of each pin.

my friend said the definitions of pins on my mainboard is as follow.
1 and 3- GND (2 is blank)
4- SPDIF_IN
5- +5V
6- SPDIF_OUT

However I don't know the definitions of pins on the module.