Gregos, did I understand correctly, that this is your cabling ?
ADI-2 Pro -- ADAT OUT----------------> ADAT? IN -- Fireface UFX
What ADAT ports do you use on the UFX ?
I ask because on the Fireface UFX the
- ADAT2 ports can be configured for ADAT or SPDIF, but
- ADAT1 only supports ADAT (not SPDIF) protocol.
The protocol (ADAT or SPDIF) needs to match between the two devices !!
I suggest to use ADAT as protocol, because then you have two advantages:
a) you can configure the ADI-2 Pro's output for ADAT protocol and connect it to UFX to either ADAT1 or ADAT2 in,
b) if you configure ADAT2 port on UFX to use ADAT protocol for in and out, then ADAT2 port is independend from AES, see block diagram.
Configure ADI-2 Pro and UFX to use ADAT protocol:
1. ADI-2 Pro (latest firmware): "Setup->Options->SPDIF/Remap Keys -> Optical Out -> ADAT"
ADI-2 Pro manual needs a correction here, it changed with more recent firmware
2. UFX: RME driver settings under Input and Output Options:
"Optical 2 In ---> ADAT 2"
"Optical 2 Out ---> ADAT 2"
Regarding clock: who is clock master in this setup ?
If you use the UFX as clock master, then you also need to provide a TOSLINK cable from UFX to ADI-2 Pro.
BTW .. you can check ADAT ports and TOSLINK cables by performing a loop test on each of the devices.
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13