[Dr_C2]

I just checked. There are at least two variants of the DSD TECH opto block.

Mine are SH-U11F with FTDI chipset.

Variant SH-U11H uses the Prolific PL2303GC chipset so it does look like your PC selected the correct drivers for your opto block.

So back to the question … which lights are showing on the opto block?

c