Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Ethernet/Memory Expansion (EME) Kit |
| Compatible Hosts | GE D20 VME, D200 Substation Controller |
| Memory Capacity | 8 MB Global Memory (Standard) |
| Ethernet Interface | 10BASE-T (RJ45) |
| Processor Speed | 133 MHz |
| Data Buffer | 120 KB |
| Operating Voltage | 12 VDC (Internal) |
| Temp Range | -20°C to +60°C |
| Kit Components | Main Board, MIC, Interconnect Cable |
| Firmware Req. | Re-install required if upgrading from GreenSpring |
Product Introduction
The GE D20 EME is an expansion kit designed to add Ethernet connectivity and/or Global Memory to existing GE D20 and D200 substation controllers. It replaces older GreenSpring Ethernet cards or adds memory to memory-only configurations, enabling modern SCADA integration without replacing the entire RTU chassis.Unlike simple plug-in cards, this kit requires internal routing of the interconnect cable between the main board and the Media Interface Card (MIC). The GE D20 EME supports 8 MB of Global Memory for data buffering and 10BASE-T Ethernet for upstream communication, operating at 133 MHz. (Note: Routing the cable outside the chassis is a common field error that causes EMI issues—keep it internal.)
Installation & Configuration Guide
Preparation (10 min)
- Verify chassis part number against the compatibility list (e.g., 500-0305 is not compatible).
- Confirm power supply headroom. Adding Ethernet increases load; check your PSU rating.
- Gather tools: #2 Phillips, anti-static wrist strap, cable ties.
Removal (5–10 min)
- Power down the D20/D200 completely.
- Remove the front panel and locate the existing GreenSpring card (if present).
- Disconnect ribbon cables carefully. Do not yank.
- Self-correction: I initially forgot to mention taking a photo of the jumper settings before removal. Always photograph jumper/DIP settings before pulling the old card.
Installation (10 min)
- Seat the GE D20 EME main board into the VME slot.
- Connect the Media Interface Card (MIC) to the front panel opening.
- Route the interconnect cable inside the chassis. Secure with cable ties to prevent vibration damage.
- Ensure no sharp edges are pinching the cable.
Power-On & Test (10 min)
- Apply power. Check LED indicators on the MIC.
- If upgrading from GreenSpring, you must re-install firmware into the D20ME/ME II processor.
- Verify Ethernet link light and ping the RTU from the SCADA master.
- Confirm Global Memory is recognized in the maintenance software.
Troubleshooting Quick Reference
| Symptom | Probable Cause | Action |
|---|---|---|
| No Link Light | Cable routed outside chassis | Reroute interconnect cable internally. EMI is likely blocking signal. |
| Firmware Error | Upgraded from GreenSpring | Re-flash D20ME/ME II processor. Old firmware won’t recognize EME. |
| Intermittent Comm | Loose MIC connection | Reseat MIC and check interconnect cable for pinch points. |
| Boot Failure | Incompatible Chassis | Check chassis P/N. Older 500-0280 (w/o 953-3061) is unsupported. |
| High Temp | PSU Overload | Measure 12V rail under load. Add auxiliary supply if voltage sags >5%. |
Dimensions, Mounting & Wiring Notes
- Form Factor: VME 6U (Standard D20 Slot)
- Mounting: Front panel MIC + Internal Main Board
- Cable: Internal interconnect required (included in kit)
- ⚠️ Warning: Never route the EME interconnect cable outside the chassis. This violates EMC standards and will cause communication failures.
- Termination: 10BASE-T RJ45 on MIC; Internal ribbon to main board.
FAQ
Can I use the GE D20 EME in a 500-0305 chassis?
No. The 500-0305 chassis is explicitly listed as incompatible. Check your chassis label before ordering.Do I need new firmware if I’m just adding memory?
Usually no. Memory-only upgrades often work with existing config, but always verify with your current firmware revision. Ethernet upgrades always require a re-flash.I’m getting weird EMI noise after install. What gives?
You likely routed the interconnect cable outside the chassis. It must be inside. This is a hard requirement, not a suggestion.Is this a direct swap for the GreenSpring card?
Hardware-wise, yes. Software-wise, no. You must re-install the OS/firmware after the physical swap.Can I get this with 16 MB memory?
Standard is 8 MB. Upgrading to 16 MB requires a specific Memory Expansion Daughter Card (526-2115) and a main board that already has memory installed. You can’t add memory to a memory-less main board.What’s the lead time on these?
We stock tested units. Typically ships same-day if ordered before 2 PM EST. All units come with a 1-year warranty and test report.I have a D200, not a D20. Does this fit?
Yes. The GE D20 EME kit is designed for both D20 VME and D200 platforms. Just verify your specific D200 chassis revision.
