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D20/D200 Technical Overview
2.2.3.2 Base Applications
The D20 base system includes the following applications:
• WESDAC Interface Node (WIN)
• WESMAINT
• System library resources
Base applications, which are stored in flash memory, can be classified as one of the following:
• Data Collection Applications (DCAs), which poll devices to collect data.
• Data Processing Applications (DPAs), which request and process data required by a
host/master computer.
• Data Translation Applications (DTAs), which manipulate data inside the RTU to generate
new information, translate data to different formats, or take action when certain events occur.
WESDAC Interface Node
The WESDAC Interface Node (WIN) is the central database for the D20/D200. WIN manages
the transfer, storage and manipulation of data between DCAs, DPAs, and DTAs. WIN sends
requests for data to, and receives new data from, DCAs, then stores the new data in the system
database. WIN also receives requests for data from, and sends data to, DPAs, and routes data
output operation requests from DPAs to DCAs.
WESMAINT
WESMAINT is a maintenance facility that resides on the D20 and D200. For a more detailed
description, see section 3.3, WESMAINT
System Library Resources
The system library resources are collections of commonly used functions that assist programmers
in the development of new code. There are several libraries available for the D20.
D.20 Link Subsystem
The D.20 Link subsystem is a DCA that polls data from the D20 I/O peripheral modules, and
then routes that data to WIN. It also asks the peripherals to perform any output operation
requests that it receives from WIN. These communication transactions properly package the data
and send or receive it over the D.20 Link.
The D.20 Link subsystem, which is known as the peripheral scan process, works with the D.20
Link driver to communicate with peripheral modules. The D.20 process formats the data
according to the requirements of the D.20 protocol then calls the HDLC driver, which provides
the actual hardware interface between the D20ME and the I/O peripherals.
2.2.4 Time Synchronization
The D20ME/ME II can be used as an accurate timeserver for synchronizing the clocks of
substation equipment connected to the D20 Ethernet or serial ports.
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PRPI-019-3.00-10
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