ABB i-bus EIB Mode D'emploi page 23

Fig. 1 / Overall View
1 UP-watchdog 180 comfort
2 Slide switch (selecting mode of operation)
5 Covering frame 1721 NS (you can use perforated
sheets (Article No. 1799-03) for labeling (item 10))
8 UP Coupler (here, eg., 6120U-500)
with programming key (item. 8a)
and programming LED (item.8b)
GB