Video tutorial for setting up the 881 Trigger Input Interface (TII).
https://system80.net/product/881/
These instructions work for both the 881 8 HP Eurorack expander module as well as the TII in the 880 desktop enclosure.
Trigger Input Interface or 'Tee Eye Eye' is a bit of mouthful, so we've abbreviated it as 'T2' interpreting the 'II' as Roman numerals.
The TII uses the TRIGGER 1 and TRIGGER 2 lines as a serial data interface. This is why there is a fairly baroque series of steps for setting up the TII.
