Not an actual issue, but a link to another '80s German magazine with more protocol details #1
Description
https://www.stcarchiv.de/stc1988/07/gabriele-9009-1
https://www.stcarchiv.de/stc1988/08/gabriele-9009-2
Two-part article of how to control the thing from an Atari ST with a BASIC dialect. However, the articles document the protocol and seem to machine-translate rather well. Hope this is of some use.