Digital guide
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GE DS3800DCMB1D1C
Product Name: Mark IV DCMB Digital Communication Module
Product Introduction: Serial communication and control-logic board in Mark IV; exchanges data with external meters, recorders, or peer controllers.
Technical Specifications:
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Ports: 2 independent serial (Port A / Port B)
Detailed content
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Standards: RS-232C, RS-485
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Baud: 300 bps – 115.2 kbps
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Protocols: Modbus RTU, ASCII, GE GENIUS Bus
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Isolation: 2500 V DC serial-to-backplane
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Power: +5 V / +24 V from Mark IV rack
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Indicators: TXDA, RXDA, DTSA, CDA LEDs
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Jumpers: 7 configuration
Functional Features: EPROM-based control code, watchdog, redundant comms option, onboard UART framing.
Application Scenarios: Link Mark IV to HMI, data historian, or third-party protection relay.
Material Composition: FR4, UART ICs, opto-isolators, EPROM sockets.
Structural Characteristics: 40-pin + 20-pin headers, DIP switches, extractor arms.
Working Principle: Controller writes message to UART → framed per protocol → driven to field device; reply parsed back to Mark IV memory.
Installation Requirements: Terminate RS-485 both ends with 120 Ω; isolate serial shield.
Usage Notes: Baud and parity must match remote device exactly; do not swap Port A/B without config change.
