D20ME 820-0468/00
D20ME 820-0468/00
D20ME 820-0468/00 GE-Harris board marking
D20ME 820-0468/00
D20ME 820-0468/00
D20ME 820-0468/00 GE-Harris board marking
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  • Lifecycle status

    Discontinued / Obsolete by OEM
    Apter Power supports condition verification, official-document review, quotation, and legacy-system sourcing coordination for this D20ME processor.

D20ME 820-0468/00

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GE-Harris D20ME 820-0468/00 is a WESDAC processor module whose seven programmable serial channels support data exchange with SCADA masters, satellite RTUs, and intelligent electronic devices.
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Technical specifications for D20ME 820-0468/00

  • Manufacturer:
    General Electric
  • Part Number:
    D20ME 820-0468/00
  • Product Family:
    GE Multilin
  • Product Type:
    Substation Controller Processor Module
  • Stock:
    1
  • Processor Communications:
    Seven programmable RS-232 serial ports
  • Serial Port Speed:
    Up to 38.4 kbps on all seven ports
  • Maintenance Interface:
    RS-232, 9600 baud
  • Peripheral Links:
    Two HDLC ports
  • Power Consumption:
    3.5 W typical; 5 W maximum
  • Status Indicators:
    RUN, HALT, FAIL, ALARM
  • Firmware Architecture:
    BootROM and flash applications
  • Weight:
    0.32 kg
  • Estimated shipping dimensions:
    2 x 18.5 x 26.1 cm
  • Tariff Code:
    Please confirm the destination before shipping
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Serial LEDs Migration Product Applications

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.
Description
The D20ME 820-0468/00 is a GE-Harris WESDAC processor module developed for D20 and D200ME substation-control installations. It provides the processing layer that brings field information into the RTU architecture for supervisory communication and local control.

Seven programmable RS-232 channels let the D20ME 820-0468/00 exchange data with SCADA masters, satellite RTUs, and intelligent electronic devices. The documented interface set also includes two HDLC links, supporting communication between the processor and associated D20 equipment.

For on-site service, the D20ME 820-0468/00 presents a front-panel WESMAINT connection together with RUN, HALT, FAIL, and ALARM indicators. This arrangement gives technicians a direct maintenance point while keeping operating-state information visible at the installed module.
Alternative Names
WESDAC D20ME 820-0468/00 GE-HARRIS 820-0468/00 D20ME 820-0468-00
Technical notes
D20ME 820-0468/00 is tied to the discontinued D20/D200ME architecture. Before a board exchange, retain the site firmware image and serial-channel assignments, then verify the chassis configuration and termination hardware. GE treats G500 and D20MX/D200MX as migration platforms, not automatic drop-in replacements; protocol and cabinet integration require engineering review.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What should a buyer compare before accepting D20ME 820-0468/00 as a replacement for an installed processor?
Accept it for engineering review only when the PCB reads GE-HARRIS 820-0468/00 and the front panel reads WESDAC D20ME. Then compare the installed chassis position and firmware label; stop the replacement if either identity point differs.
How should an engineer plan serial-channel assignments when recommissioning D20ME 820-0468/00?
Start from the installed D20 configuration. GE documents seven programmable RS-232 channels for D20ME, but the project determines their SCADA-master, satellite-RTU, or IED assignments. Recover the port map before moving any cable.
How can maintenance staff interpret D20ME 820-0468/00 front-panel LEDs when a controller stops communicating?
Use RUN to check microprocessor activity, HALT to identify a stopped processor, and FAIL to identify active or failed diagnostics. GE states that ALARM is not implemented on D20ME/ME II; preserve the configuration and escalate persistent HALT or FAIL states.
What maintenance connection should be prepared before servicing D20ME 820-0468/00 through WESMAINT?
Prepare the GE-documented 9600-baud RS-232 maintenance link and the site-approved cable. Confirm the maintenance-port settings before connection; stop rather than improvising if the cable pinout or site procedure is unavailable.
What must a migration study cover before moving from D20ME 820-0468/00 to G500 or D20MX/D200MX?
Treat those products as GE-identified migration alternatives, not direct replacements. Map serial protocols, peripheral links, I/O, power, chassis, firmware, and application software, and proceed only after an engineering review confirms the new architecture.
Which records should a plant preserve before removing D20ME 820-0468/00 from a legacy D20/D200 controller?
Back up the active configuration, record firmware and per-port assignments, photograph connectors and status indications, and label peripheral cabling. Pause removal if the configuration or cable map cannot be preserved for recovery and migration work.