The UNICONT MDU-102 is a marine-grade NMEA buffer unit that takes one or two NMEA 0183 (RS-232/RS-422/485) inputs and reliably distributes them to eight galvanically isolated outputs. It ensures data integrity, prevents signal degradation, and protects connected equipment from electrical issues like ground loops, making it essential for managing navigation and sensor data on a vessel. The UNICONT MDU-102 is a marine-grade NMEA buffer unit designed to efficiently multiply and distribute NMEA 0183 (and other serial RS-232/RS-422/485) data signals from one or two sources to up to eight output devices. It features isolated inputs and outputs to protect connected equipment from electrical interference and can provide redundancy by switching between two input channels.
Technical Specification
General Characteristics:
- Device Type: NMEA Buffer, Data Multiplier, Amplifier, Distributor, and Multiplexer.
- Purpose: Multiplication and distribution of NMEA 0183 signals (versions 1-3, compliant with IEC 61162-1, IEC 61162-2) or other serial data transmissions (RS-232 and RS-422/485 interfaces).
- Input Channels: 2 (CH1, CH2)
- Output Channels: 8 (configured as 2 groups of 4 outputs each: Group A and Group B)
- Checksum Test: Provides a checksum test for data received on the first channel (CH1).
- Operating Modes:
- Signals’ multiplication (with active channel option – manual or auto-selection).
- Independent mode of operation (CH1 data to Group A outputs, CH2 data to Group B outputs).
- Signals’ multiplication (with checksum option).
- Automatic selection to a backup channel (CH2) if primary input (CH1) fails or data is invalid.
- Forced active channel selection (via jumpers).
- Remote active channel selection (via external terminals).
Electrical Characteristics:
- Power Supply Voltage: 10 to 36 VDC (Nominal 24 VDC).
- Power Consumption: Max 3 W.
- Galvanic Isolation from Power Mains: Yes.
- Reverse Polarity Protection: Yes.
- Overvoltage Protection: Yes (via a 1A fuse).
Inputs:
- Number of Input Ports: 2 (CH1, CH2).
- Supported Interfaces: RS-232, RS-422/485.
- Max Baud Rate: 115200 bit/s (BPS).
- Optoisolation of Input Ports: Yes (for protection against ground loops and noise).
Outputs:
- Number of Output Ports: 8 (2×4).
- Number of Output Groups: 2 (Group A and Group B).
- Galvanic Isolation of Output Ports:
- 4 outputs are non-isolated.
- 4 outputs are galvanically isolated (also referred to as optoisolated in some documentation).
- Supported Interfaces: RS-232, RS-422/485.
- Max Baud Rate: 115200 bit/s (BPS).
General/Physical Characteristics:
- Overall Dimensions: 194 mm (Width) x 117 mm (Height) x 29 mm (Depth). Some sources list 194x119x31 mm.
- Weight: 0.5 kg (500 grams). Some sources list 0.65 kg.
- IP Rating (Protection Degree): IP 22 (Protected against solid objects over 12.5mm and dripping water when tilted at 15 degrees. Suitable for indoor, protected environments).
- Operating Temperature: -25°C to +55°C (Some sources indicate -15°C to +55°C).
- Storage Temperature: -55°C to +75°C (Some sources indicate -60°C to +70°C).
Compliance & Certifications:
- EMC: Complies with relevant electromagnetic compatibility standards, typically IEC 60945 (Maritime navigation and radiocommunication equipment and systems – General requirements – Methods of testing and required test results).
- Type Approvals: Often holds type approval certificates from various classification societies (e.g., Russian Maritime Register of Shipping, ABS, depending on the unit’s specific manufacturing batch and intended market).
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