3278 Switch Control Unit Feature 
The Switch Control Unit feature provides a switch (Figure 4-7) that enables you 
to connect your 3278 Display Station to either 
of 
two control units (designated 
CUI  and CU2).  Your organization's operating procedures may have you switch 
from one control unit 
to 
the other to perform different tasks. 
To switch from one control unit to another: 
1. 
Set the Normal/Test switch on the 3278 
to 
Test. 
2.  Set the 
Control Unit Selector switch to the position that selects the desired 
control unit 
(CUI  or CU2). 
3.  Return the Normal/Test switch on the 3278 to Normal. 
Control_ 
Unit 
1 
Figure 4-7.  Control Unit  Selector Switch 
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