Contemporary Control Systems BAScontrol20 User Manual - Manual (Page 37)

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5.2.5 Binary Inputs (Channels BI1–BI4)
You can accept a binary input with any channel BI1–BI4 as follows:

On the Main Page ( Figure 13 ), click a title link from among BI1–BI4.

Under BAS Channel Configuration in the new page that appears ( Figure 23 ),
the Channel Type should be Binary Input by default.

In the BACnet Object Configuration (lower) section of the screen, all items
are as described in Section 5.2 above — but Units defaults to NO_UNITS.

Attach your device to the pair of BASC20 pins for the chosen channel
— so
that the more positive connection is to pin A and the more negative to pin C.
Figure 23
— Binary Input Configuration