GE Multilin D20-MIC-10BASE-T – 10BASE‑T Ethernet Interface Card for D20/D200 RTU Networking

The D20-MIC-10BASE-T is a 10 Mbps copper Ethernet interface card designed for GE Multilin D20 (and in many cases D200) RTU systems. It gives legacy D20 installations a reliable RJ45 10BASE‑T LAN port, typically used for SCADA backhaul, engineering access, or integration to modern control center networks without replacing the entire RTU. From my experience, this card is a straightforward way to add TCP/IP connectivity to an otherwise stable D20 platform—minimal disruption, solid value.

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Key Features

• 10BASE‑T Ethernet (RJ45) – Standard copper interface for straightforward LAN integration in substations and plants.
• Backplane powered – Draws power from the D20 chassis; no external PSU, fewer wiring points.
• D20/D200 platform fit – Purpose-built form factor for D20 slots, easing field replacement and spares holding.
• Status LEDs – Link/Activity indicators make field diagnostics faster; you can see at a glance if the port is live.
• Industrial robustness – Designed for utility and industrial environments; typically used in substation-grade cabinets.
• Protocol-ready at system level – On D20 platforms, it’s commonly paired with DNP3/TCP or Modbus TCP stacks (actual protocol support depends on your D20 firmware configuration).

Technical Specifications

Application Fields

Utilities and industrial operators typically deploy this card where a D20 is already trusted: transmission and distribution substations, water/wastewater SCADA, oil & gas gathering and pipelines, and thermal or hydro plants. You might notice that adding Ethernet often simplifies integration to modern HMI/SCADA hosts while keeping serial links as a fallback.

• Substation automation – LAN connection to master stations using DNP3/TCP
• Process plants – Interface to historian/MES via Modbus TCP on the D20 platform
• Remote sites – Engineering access for configuration and remote diagnostics

Advantages & Value

• Life extension of installed assets – Keep existing D20 I/O and logic intact while adding IP networking.
• Lower total cost – Avoid a full RTU replacement; typically faster commissioning, less re-testing.
• Standard cabling – RJ45 copper simplifies spares and field maintenance.
• Compatibility – Works within the D20 ecosystem and its common protocol stacks (as licensed in your CPU firmware).
• Serviceability – Field-replaceable card; straightforward diagnostics with LEDs.

Installation & Maintenance

From my experience, treating this like any substation-grade comms card leads to fewer surprises.

• Environment – Install in a D20 chassis inside a properly grounded control cabinet with adequate ventilation. Avoid condensation and dust ingress.
• Wiring – Use shielded CAT5e or better for longer runs in noisy environments. Maintain proper earthing and segregate from high-voltage conductors.
• Handling – Power down the D20 before insertion/removal; observe ESD precautions. Seat the card fully and secure front screws.
• Configuration – IP addressing, routing, and protocol setup are done on the D20 CPU/firmware layer. Verify protocol licenses (e.g., DNP3/TCP, Modbus TCP) as applicable.
• Routine maintenance – Periodically check connector tightness and LED status; review event logs; update D20 firmware as recommended by the manufacturer.

Quality & Certifications

• Typically supplied as part of a CE and UL/CSA compliant D20 system; RoHS status may vary by manufacturing lot
• Manufacturer compliance and exact markings should be verified against the specific build and datasheet
• Warranty: 365 days (our supply coverage)

Related/Supporting Components

• D20 CPU/processor module – for protocol stacks and configuration
• D20 power supply and chassis – required backplane and mechanical housing
• D20 I/O modules (AI, AO, DI, DO) – typical field signal expansion around the same RTU

If you’re replacing an existing card, a quick check of the current D20 firmware and protocol licenses usually shortens commissioning. One thing I appreciate is how predictable the upgrade path tends to be—swap the card, validate IP, and your SCADA polls come back online with minimal scripting changes.