Well I just played around with the Configurator, and one can configure it for 4 digital inputs, I have attached a screenshot. From right to left they are Digital 1 through Digital 4. Note I did not try downloading the file and using it in my Devialet.
Roon ROCK on Intel NUC6i5SYH/Ethernet | VPI Avenger | Devialet 440 Pro CI | Vivid Audio Giya G3 | Auralic Aires Mini | Synology 1812+ NAS
SXSW, US