MD77HR Datasheet

MD77HR Datasheet

MD77HR Datasheet

Product catalog summary
Overview: The MD77HR is a compact NMEA-based heading repeater designed for marine vessels. It displays digital heading data, allowing users to select between multiple heading sources, such as True and Magnetic, and indicates the current source in use. The device is compact, rugged, and can be mounted on a bulkhead or panel, finished in Jet Black to match other marine equipment.
Applications: The MD77HR is compatible with marine equipment that transmits True or Magnetic Heading Data via NMEA 0183, including gyro compasses and GPS compasses.
Accessories: Includes a panel mounting kit, bulkhead bracket mounting kit, and remote dimmer control.
Features: The device features a traditional marine compass card display, dual power supplies with monitoring, automatic baud rate detection, and error indication. It also offers local and remote dimming control and is constructed from rugged, marinised aluminium.
Operational Specifications: The MD77HR provides ±0.5° accuracy, a follow-up rate of over 20° per second, and LED dial illumination with red tint. It has a rotating compass card dial display and indicates power supply failure and errors through dial oscillation. The device has a mean time between failures (MTBF) of 30,000 hours.
Physical Specifications: Weighing 1.25 kg, the device measures 166mm in height, 200mm in width, and 81mm in depth. It can be panel or bulkhead mounted and connects via a 15-pin D-sub plug.
Electrical Specifications: The MD77HR operates on a 24 V dc power supply and supports digital RS422 data input with auto-selecting baud rates. It detects data sentences THS, HDT, HDG, and HDM on start-up.
Environmental Specifications: The device is compliant with IEC 60945 for protected areas, operates between -15°C and +55°C, and is RoHS compliant. It has a compass safe distance of 85cm standard and 45cm for steering.
Approvals: The MD77HR conforms to various international standards, including BS EN 60945, BS EN 61162-1, and several IMO resolutions. It has type approval from DNV.
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Catalog excerpts

MD77HR Datasheet-1

COMPASS & HEADING / DIAL REPEATERS MD77HR DIAL COMPASS REPEATER DISPLAY SKU: F077052 View Online › OVERVIEW The MD77HR is a NMEA-based Compact Heading Repeater. Digital heading data (ship’s heading) may be conveniently displayed and monitored at any location on a vessel. Traditional Marine Compass Card Display Main and Emergency power supplies; with monitoring of both True and Magnetic) the MD77HR allows the user to select the heading Automatic Baud Rate Detection Compact and rugged, the MD77HR offers a heading repeater Automatic indication of loss of valid heading data either bulkhead or panel mounted. Finished in Jet Black (RAL9005) Automatic detection of a previously lost heading data type without requiring a reset When multiple heading sources are available in the heading data (e.g. source and indicates which heading source is in current use. solution for locations where the available space is limited and may be Fine-texture Powder Coat to complement other marine navigation equipment. The MD77HR from Marine Data: flexible in application, easy to install and simple to maintain. Prioritisation of heading type Local and Remote Dimming Control Rugged, Marinised Aluminium Construction The MD77HR displays True or Magnetic Heading Data transmitted from marine equipment compatible with NMEA 0183 (IEC 611621) (Gyro compass, TMC, EMC, GPS Compass etc.) Panel Mounting Kit (Supplied) Bulkhead Bracket Mounting Kit Remote Dimmer Control (0-24 V dc) RELATED PRODUCTS • The complete range of Marine Data Heading Repeaters Transmitting Heading Device (THD) Systems (TMC

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MD77HR Datasheet-2

1.25 kg (with bulkhead mounting bracket) Panel or optional Bulkhead mounted Dial Illumination: LED array with local and remote dimming control. Red tint 1x data cable to 15-pin D-sub plug Dial Resolution: Aluminium alloy enclosure Rotating compass card dial display Jet Black (RAL9005) Fine-texture Powder Coat Power supply failure: Visible indication Error Indication: Heading Type: LED indicator for heading source type: Gyro Compass / Magnetic Compass 30,000 hours ELECTRICAL Power Supply: Data Input: Data Protocol: Data Sentences: THS, HDT, HDG and HDM; detected on start‑up in descending order...

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