Contemporary Control Systems BAScontrol20 User Manual - Manual (Page 39)

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5.2.7 Binary Outputs (Channels BO1–BO4)
The BASC20 can provide four binary relay outputs (BASC-20R) or four triac outputs
(BASC-20T). The voltage and current limits for relay units are 30 VAC/VDC and 2 A.
For triac units the limits are 30 VAC and 0.5 A. Violating these limits could damage
the BASC20 and void the warranty.
Relay channels can be used as contact closures for other devices, but triac channels
can only be used to enable or restrict the flow of AC current. It is common for the
BASC20 binary outputs to enable the coil of interposing relays which can carry larger
currents and support switching higher voltages.
Any channel BO1–BO4 can be used to provide an binary output. The BACnet type
will be Analog Output. To configure an analog output:

On the Main Page ( Figure 13 ), click a title link from among BO1–BO4.

Under BAS Channel Configuration (lower) section of the new screen that
appears ( Figure 25 ), the Channel Type will be Binary Output (read-only).

In the BACnet Object Configuration (lower) section of the screen, all items
are as described in Section 5.2 above. Units will default 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 B.
Figure 25
— Binary Output Configuration