Connecting asus spdif module to asus p4b mobo

[karmstrong]

ok went out and bought an asus spdif out module for my puter - the mobo has spdif 6 pin connector on board

problem is module only has 3 pin connector

anyone know how to connect

module has pins 1,2,& 3 says 1& 2 for green header (ac97) and 2&3 for black header pci audio

mobo has spidf out +5v spdif in
ground ground

on the 6 pin connector (1 pin missing)

do i connect spdif out & ground or spdif out & +5v?? don't want to fry the module

Thanks 4 your help
Ken