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Theory of Operation
63
9.2.4 Logic Modules
The logic contains three separate redundant logic modules. The modules contain the logic necessary
to run the STS2 and control transfers and shunt trips under all circumstances, without any outside
assistance once set-up and started properly.
9.2.5 Audible Alarm
An audible alarm is installed on the control board. This alarm is triggered by an alarm condition
detected on the unit. The alarm can be turned off from the touch screen (Color Graphical Display
units) or by a push button (LED Display units). Turning off the audible alarm does not clear or reset
the condition that triggered the alarm.
9.2.6 RS-232 Port
An RS-232 serial port is provided to allow an external terminal to be connected as another user inter-
face. See 12.1 - Using the RS-232 Port on page 76 for more information on using the RS-232 port.