In the manual it's stated that SACD is not available through optical/coaxial output. It's available through the HDMI output, but your DAC does not have HDMI input.
Oppo 103 and stand alone DAC
I have a Oppo 103D and I just purchased a PS Audio Digilink DAC. I hooked it up with balanced cables to my ARC preamp and it will play CD’s but not SACD’s. What am I doing wrong?