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Figure 3: SEL-2020 Functional Model
Functional Model
Figure 3 shows a functional model of the SEL-2020 including the Input Handlers, Message
Generators, Data Area, SEL
OGIC Control Equations Processor, Time Processor, optional I/O,
optional nonvolatile archive memory and optional Internal Modem.
Input Handler/Message Generator
There is an Input Handler and Message Generator for each serial port. When you communicate
with the SEL-2020 using the command set, the Input Handler separates the commands into their
basic components. The Input Handler sends data to the Data Area and directs the Message
Generator to make a response based on the SEL-2020 settings that you have defined.
When you use the SEL-2020 as a port switch, the Input Handler places collected data in the Data
Area, and the Message Generator reads and outputs these data to a designated port. The Input
Handler also stops communication when it recognizes the default termination condition or a
termination condition you have defined in settings.
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