IP Substation - Additional DAK keys

The IP substation board supports input for 10 DAK-key, as well as M-key and C-key. The inputs are available on soldering pads on the substation PCB.

Inputs:

DAK 1:  N115 + N112
DAK 2:  N115 + N113
DAK 3:  N115 + N114
DAK 4:  N105 + N110
DAK 5:  N105 + N111
DAK 6:  N105 + N112
DAK 7:  N105 + N113
DAK 8:  N105 + N114
DAK 9:  N105 + N115
DAK 10: N106 + N110
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M-key:  N115 + N111
C-key:  N115 + N110