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GE DS3820PSCC1D1
Product Name: GE Speedtronic Mark VI Serial Communication Module
Introduction: A VME-based interface board providing two independent serial channels for data exchange between a Mark VI turbine controller and external intelligent devices such as PLCs, meters, drives, and HMI.
Detailed content
Technical Specifications:
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Communication Ports: 2 × independent, software-selectable RS-232 / RS-485
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Protocols: Modbus RTU (master/slave), GE SRTP
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Baud Rate: 300 bps – 115.2 kbps
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Data Format: 7/8 data bits, 1/2 stop bits, none/odd/even parity
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Isolation: 1500 V DC opto-isolation between ports and VME backplane
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Supply: +5 V DC from Mark VI rack backplane
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Latency: ≤ 10 ms typical
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BER: ≤ 1×10⁻⁹
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Temperature: 0 °C to +60 °C operating, −40 °C to +85 °C storage
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Humidity: 5 %–95 % RH non-condensing
Functional Features: Dual-channel concurrent polling, data-table mapping into Mark VI control memory, TX/RX/ERR LED per channel, ESD protected transceivers.
Working Principle: Serial bytes from field device → opto-isolator → UART → VME bus → Mark VI CPU; reverse path for outbound writes.
Materials & Structure: Flame-retardant ABS front bezel, FR-4 glass-epoxy PCB, DB9 (RS-232) and screw-terminal (RS-485) rear connectors, standard Mark VI single-slot faceplate.
Installation: Insert into designated Mark VI I/O slot; tighten retention screws; verify backplane key alignment.
Precautions: Do not mix RS-232/RS-485 wiring on same port; terminate RS-485 at both ends with 120 Ω; avoid hot-swapping under live backplane power.
