What's New - GE D20 Technical Overview

D20/D200 Technical Overview
GE Grid Solutions

What's New

GE Grid Solutions is pleased to announce the following additions to the D20/D200 product
family:
D20ME II Main Processor
The D20ME II, the fifth generation of D20/D200 processors, builds on the increased memory,
performance and communication port speed introduced with the D20ME. Where the D20ME
supports up to eight RS-232 serial ports (one of which is reserved for the maintenance port), the
D20ME II supports:
• Seven serial ports, each of which can be configured as either RS-485 or RS-232, and
• One RS-232 maintenance port.
Each D20ME II RS-485 port can communicate with up to 32 devices and operate over distances up
to 4000 feet, without the use of repeaters (see note below). The D20ME II is backwards compatible
with VME and non-VME versions of the D20 chassis, and with the D200 chassis. For more
information, see section 2.2, Main Processor.
Figure 1 D20ME II Main Processor
Note: The RS-485 port on the D20ME II provides no isolation and offers limited built-in
transient suppression. If you are using the D20ME II in an environment where longer cable runs
with larger transients are expected, installation of an external transient suppression device is
recommended to protect the RTU. In addition, GE recommends the installation of an external
transient suppression device when the RS-485 communication cable must be run to devices
located outside of the RTU cabinet containing the D20ME II. Contact Customer Service for
additional information.
PRPI-019-3.00-10 GE Information
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