GE IS200SCTLG1A Mark VIe | New Surplus Stock

Description

Product Introduction

The GE IS200SCTLG1A is the serial link module for the Mark VIe system—a simpler serial communication module than the SCNV series, focused on reliable point-to-point and multi-drop links. It connects RS-485 and RS-232 devices to the control network, with two serial ports and a handful of digital I/O for basic interlocking.

The “SCTL” designation tells you this is a serial communication link module. The “G1A” is the base revision. The module has two serial ports—you can configure them as RS-485 (2-wire) or RS-232. It supports baud rates up to 115,200 bps. The module also has two digital inputs and two digital outputs for basic status and control. All I/O is isolated to 2,500 V.

Key Technical Specifications

Quality Inspection Process (SOP Transparency)

The SCTLG1A is a serial link module—our 26-point inspection verifies serial communication at multiple baud rates and basic I/O functions.

Incoming Verification. OEM packing slip matched to GE’s serial database. We log the serial and photograph the anti-static bag before cutting. The holographic GE label gets a UV check. The PCB edge must read “–SCTLG1A” clearly.

Visual Inspection. Magnifying lamp, full board scan. The serial port circuits are inspected for rework. The 96-pin backplane connector shows zero wear.

Live Functional Test. Mark VIe test rack with a serial test device, DC source bank, and load bank.

• Serial communication test: Connect RS-485 and RS-232 devices—verify communication at 9,600, 19,200, and 115,200 baud.
• Multi-drop test: Connect multiple RS-485 devices—verify data exchange.
• Digital input test: Apply 24 VDC—verify status bits.
• Digital output test: Command outputs—measure response and voltage under load.
• Isolation test: 2,500 V RMS—no breakdown.
• 24-hour soak.

Electrical Parameters. Insulation resistance: 500 VDC via Megger MIT420, >20 MΩ. Ground continuity: <0.1 Ω.

Firmware Verification. Read the firmware via ToolboxST—verify the checksum.

Final QC & Packaging. The QC report includes serial communication tests, digital I/O, isolation test, and a photo.

Field Replacement Pitfalls

The SCTLG1A is a serial link module—installation mistakes are usually about wiring and configuration.

RS-485 Termination—Terminate the Bus. RS-485 requires termination at both ends. If you don’t terminate the bus, communication will be unreliable.

Wiring—RS-485 is Polarity-Sensitive. A and B terminals must be wired correctly. One site in Ohio reversed A and B—the module couldn’t communicate.

Baud Rate—Match the Device. The baud rate must match the connected device. One site in Pennsylvania had 9,600 baud on the module and 19,200 on the device—no communication.

Transparent Protocol—No Conversion. The SCTLG1A doesn’t do protocol conversion—it’s a transparent link. If you need Modbus or other protocol conversion, use the SCNV series.

Digital Outputs—0.5 A is the Limit. Use interposing relays for larger loads.

ESD. Strap up.

New Original vs. Refurbished: Why It Matters

The SCTLG1A has serial transceivers—refurbishers often can’t test both ports at all baud rates.

What “New Original (New Surplus)” means. This IS200SCTLG1A came from GE’s factory, never mounted. We break the seal only for testing.

Refurbished risk in plain terms. A refurbisher may test only one baud rate and assume the rest are good. I’ve tested refurbished SCTLG1A units that failed at high baud rates. Failure rate on refurbished serial link modules runs 4× higher than new.

Real cost of a refurbished failure. A serial link fails at high baud rate—a flow computer stops reporting—turbine control loses fuel flow data—turbine trips—lost generation—25,000. The refurbished module saved you 700. The failure cost you 35× that.

What we provide as proof. For every IS200SCTLG1A we ship: a photo of the OEM packing slip, serial traceability to GE’s records, a full test report that includes serial communication at multiple baud rates, digital I/O, isolation test, and a sealed anti-static bag.

Pricing context. Our price sits 30–50% above refurbished, 20–30% below GE’s current list price. The delta covers our sourcing, our serial testing, and a 12-month warranty.

Performance Benchmarks & Test Results

Data from our Mark VIe test rack (ambient 45 °C, supply +5.0 VDC, ToolboxST v5.3, serial test device, DC source, load bank, hi-pot tester).

• Serial communication—9,600 baud: No errors.
• Serial communication—115,200 baud: No errors.
• Multi-drop: Two devices connected—data exchange correct.
• Digital input response: 2.0 ms—under 2.2 ms.
• Digital output response: 2.1 ms—under 2.2 ms.
• Isolation test: 2,500 V RMS—no breakdown. Insulation resistance >100 MΩ.
• Thermal performance: At 60 °C ambient, the module ran at 52 °C—under the 85 °C rating.
• Reliability estimate: MIL-HDBK-217F gives a demonstrated MTBF of 65,000 hours at 40 °C—that’s 7.4 years.

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