The Scandinavian Micro Systems SR01-60H is a marine converter that translates analog Synchro (gyrocompass) and pulse Log (speed) signals from older navigation equipment into standard NMEA 0183 digital data. This enables modern navigation systems like ECDIS and radar to receive accurate heading and speed information from traditional sensors, bridging the gap between legacy and contemporary bridge electronics.
Technical Specification
1. Power Supply:
- Input Voltage: 24V DC +30% / -20% (Nominal 24V DC)
- Power Consumption: Max 2 Watt (very low power draw)
2. Synchro Input (Gyrocompass):
- Models: SR01-60H (for “High” voltage Synchro signals) or SR01-60L (for “Low” voltage Synchro signals).
- SR01-60H: Designed for 115V (RMS AC) 60Hz or 400Hz Reference signals (with 0-90V phase signals).
- SR01-60L: Designed for 26V (RMS AC) 400Hz Reference signals (with 0-11.8V phase signals).
- Gear Ratios: Selectable via DIL switches for common gyrocompass types:
- 1X (e.g., for self-aligning synchros)
- 2X
- 11X
- 36X
- Phase Load: Approximately 47 kΩ symmetrical load to internal AGND, floating.
- Inaccuracy: Better than 0.1°, with jitter typically 0.02-0.05° (using 1:1 synchro input and down to 50% of nominal voltage).
- Resolution (360:1 system): Down to 0.00003°
3. Log Input (Speed Log):
- Pulse Input: Accepts 200 or 400 pulses per nautical mile (from speed logs).
- Functionality: Converts these pulses into NMEA Speed sentences.
4. NMEA 0183 Data (Input/Output):
- Channels: Two independent Full Duplex Communication Channels.
- Isolation: Both data input and output are fully isolated.
- Baud Rate: Selectable (e.g., 4800 bps, 1200 to 57600 bps settable).
- Output Sentences (Commonly Supported):
- Heading: $–HDT (True Heading), $–HDM (Magnetic Heading), $–HDG (Heading, Deviation & Variation)
- Speed: $–VBW (Dual Ground/Water Speed)
- Rate of Turn: $–ROT (Rate of Turn, computed by the SR01-60)
- Can also function as a NMEA protocol and baud rate converter.
- Supports proprietary protocols like Sperry.
5. Alarm Signals:
- Relay Output: One Normally Open (NO) and one Normally Closed (NC) contact for external alarm indication.
- NMEA Alarm Communication: Option for alarm messages via NMEA.
- Visual Alarm: Alarm LED on the unit.
- No Sound Alarm
6. Physical and Environmental:
- Operating Temperature: -15°C to +55°C
- Physical Protection (IP Rating): IP22 (implies protection against solid objects >12.5mm and dripping water)
- Dimensions (Approximate, from diagrams):
- Box (without mounting flanges and cable glands): 140 mm (W) x 82 mm (H) x 36 mm (D)
- Flanges add 15 mm on each side for mounting.
- Mounting: Designed for panel mount or bulkhead mount. Mounting holes dia 6mm, spaced 158 x 52 mm.
- Weight: (Not explicitly stated in typical datasheets, but would be relatively light given the dimensions and power consumption).
7. Features & Functionality:
- Automatic Adjustment: Automatically adjusts to applied Gyro Compass Signal voltage levels and frequencies.
- Rate of Turn (ROT) Computation: Can compute ROT and output the NMEA ROT sentence.
- Alignment: Requires initial alignment to the gyro compass heading.
- Display: Integrated display for showing Gyro Heading or LOG speed.
- Controls: Pushbuttons for alignment, setup, and display dimming. Dedicated ALARM RESET button.
- Set-Up Programming: Done via 3 DIL Switches located under the lid.
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