Figure 11 D20Me Ii Main Processor - GE D20 Technical Overview

D20/D200 Technical Overview
1.6.2.1 D20ME
The D20ME Main Processor:
• Concentrates data from substation equipment, then processes and forwards this data to the
SCADA Master
• Receives control actions from the SCADA Master and forwards these actions to substation
equipment
• Depending on the application software supported on the unit, initiates control actions based
on the status of the substation equipment
• Processes maintenance commands received through the WESMAINT port.
The D20ME interfaces with substation equipment through:
• D20 I/O Peripherals
• RS-232 ports (eight RS-232 ports per D20ME, one of which is the maintenance port)
• Ethernet ports (two per D20/D200)
1.6.2.2 D20ME II
In addition to the D20ME functionality described above, the D20ME II main processor can be
configured to support RS-485 communications on any of seven serial ports (the eighth is
reserved for the RS-232 WESMAINT port). Through each of the RS-485 serial ports, the
D20/D200 can communicate point-to-multipoint with large numbers of end devices, out to a
distance of 4000 feet.
18

Figure 11 D20ME II Main Processor

PRPI-019-3.00-10
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