Features:
- D20/D200 processor role for data concentration, protocol conversion, and local automation
- Seven programmable RS-232 channels for SCADA masters, satellite RTUs, and intelligent electronic devices
- Front WESMAINT access with RUN, HALT, FAIL, and ALARM status indication
D20ME 820-0468/00 is the GE-Harris WESDAC processor module identified by the board marking and front-panel label shown in the product photographs.
The D20ME architecture uses BootROM for startup and diagnostic functions and flash applications for the modular control software running on the pSOS real-time operating system.
For maintenance or replacement work, preserve the installed firmware, serial-channel assignments, HDLC peripheral links, and physical processor arrangement before changing the module.
Availability of D20ME 820-0468/00 is subject to Apter Power's current inventory, identification review, and sourcing confirmation.
D20ME 820-0468/00 GE-Harris WESDAC Processor Manuals, Datasheets, Links
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
- Project mapping: Recover the installed D20 channel configuration before recommissioning D20ME 820-0468/00.
- Programmable channels: The D20ME platform provides seven RS-232 links for SCADA masters, satellite RTUs, and intelligent electronic devices.
- Peripheral path: Two HDLC ports link the processor to D20 peripheral modules; preserve addressing and cable routing during service.
- Maintenance access: The front service interface is a 9600-baud RS-232 port and should remain separate from field-channel assignments.
- RUN: Indicates microprocessor activity through the address-strobe line.
- HALT: Indicates that the microprocessor has stopped.
- FAIL: Indicates that diagnostics are running or have failed.
- ALARM: GE states that this indicator is not implemented on D20ME/ME II.
- Lifecycle boundary: GE has discontinued manufacturing for D20/200ME substation controllers.
- Official direction: GE identifies G500 or D20MX/D200MX as alternatives, not as proven drop-in replacements.
- Architecture review: Map serial protocols, HDLC peripherals, I/O, power, chassis, firmware, and application software before selecting a migration path.
- Recovery records: Preserve the active configuration and cable map before removing D20ME 820-0468/00 from service.
- Data concentration: Collect and organize information from D20 peripherals and connected intelligent electronic devices for upstream use.
- Protocol conversion: Exchange data between field devices and supervisory systems through the D20/D200 communication architecture.
- Local automation: Run controller applications that coordinate substation monitoring and control tasks.
- RTU integration: Support communication paths between SCADA masters, satellite RTUs, and D20-connected equipment.