Data Communication / Bus - Viessmann SCU 123 Manual

SCU 123
5.4

Data communication / Bus

The controller is equipped with a VBus
with and energy supply to external modules. The connec-
tion is carried out at the terminals marked "VBus" (either
polarity). One or more VBus
via this data bus, such as
• GA3 large display, SD3 smart display
• DFA comfort remote display
• AM1 alarm module
for data transfer
®
modules can be connected
®
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