Just to clarify, there's two output options, you specify the output at time of ordering. Either AES/EBU format on XLR or SPDIF format on BNC. As they say:
Quote
To insure correct impedance matching, note that UDIO comes in two versions. (AES-EBU or SPDIF) with different internal PCB assemblies. Please make sure to select the correct format you'd like to use.
So the SPDIF output is genuine SPDIF format. You can't just change the AES/EBU snake for a SPDIF snake or vice versa.

The user manual only shows the AES/EBU connections.

Ali

Meridian G61R, Behringer A500 amps & DEQ2496 DSP, MiniDSP U-DIO8 audio interface, B&W DM2 Mk2 Speakers (3 pairs), Sony CD, Sony DAT(x3), Alesis Hard Disk Recorder, Sony APR5003 Reel to Reel Recorder. Akai AT93 Tuner & GX-95 MK2 Cassette Deck, Technics SL-1200 Turntable, Valve Phono stage, Denon DL-110 cartridge.

Ambisonic user since the 1980's