4.6
Single Bus Controllers (SBC)
A Single Bus Controller (SBC) is similar to a specialized ex-
ternal controller. SBCs are not mounted on the enclosure, but
they do send and receive communications to and from the en-
closure. SBCs are available in two versions of three models.
Each model has a different faceplate. Each faceplate holds
different keys, so the method of selecting an input or preset
differs from model to model. The two version types define the
operations you can perform with your SBC(s).
A distribution matrix can intermix SBC models and versions;
however, two SBCs connected to the same enclosure cannot
have the same identification number.
This section discusses the following:
Versions
Models
Installation
Polling SBCs
4.6.1
Versions
Note:
There are no physical indicators for differentiating
between the C version and the P version of SBCs; but,
the versions are not interchangeable. The versions
can be mixed if properly connected.
The C version of an SBC is tied to a specific output device and
controls what input is routed to the device. The output device
that the SBC is tied to is specified by the dipswitch setting on
the SBCs logic board (the board directly behind the faceplate).
This SBC version uses the output connector number (in rela-
tion to the enclosure the output is on) as its identification
number.
4-14
Chapter 4
figure 4.18 3-key SBC model
figure 4.19 12-key SBC model
figure 4.20 16-key SBC model
