en:nmea
Differences
This shows you the differences between two versions of the page.
| Next revision | Previous revision | ||
|
en:nmea [2023/12/13 23:55] obd_diagnose created |
en:nmea [2024/02/15 17:32] (current) obd_diagnose |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| ===== NMEA ===== | ===== NMEA ===== | ||
| - | NMEA stands for National Marine Electronics Association, | + | NMEA stands for National Marine Electronics Association, |
| + | |||
| + | NMEA standards define the data format and protocols for the transmission of information such as GPS positions, speeds and courses between different devices such as display instruments, | ||
| + | |||
| + | This standard enables the interoperability of different manufacturer devices and ensures that they can communicate seamlessly with each other. | ||
| + | |||
| + | The NMEA 2000 standard supports multi-packet communication of up to 1785 bytes via the ISO 15765-2 (ISO TP) standard. NMEA defines various errors in messages for diagnosis ([[OBD]]), e.g., status indicators in PGN 127489 (Engine Parameters, Dynamic). | ||
| + | |||
| + | Byte 1: Engine Instance (8-bit unsigned integer) This byte specifies the particular engine for which these data apply. A single engine has instance 0. For boats with multiple engines, numbering starts at 0 at the bow of the boat and increases towards the stern. Engines equidistant from bow and stern are numbered from port to starboard. | ||
| + | Byte 2: Engine Oil Pressure (16-bit unsigned integer) This byte indicates the engine' | ||
| + | Byte 3: Engine Oil Temperature (16-bit unsigned integer) This byte displays the engine' | ||
| + | Byte 4: Engine Coolant Temperature (16-bit unsigned integer) This byte shows the temperature of the engine coolant in units of 0.1°K. | ||
| + | Byte 5: Alternator Potential (16-bit signed integer) This byte specifies the generator voltage in units of 0.01V. | ||
| + | Byte 6: Fuel Rate (16-bit signed integer) This byte indicates the engine' | ||
| + | Byte 7: Total Engine Hours (32-bit unsigned integer) This byte indicates the cumulative running time of the engine in units of 1 second. | ||
| + | Byte 8: Engine Coolant Pressure (16-bit unsigned integer) This byte specifies the pressure of the engine coolant in units of 100 Pa. | ||
| + | Byte 9: Fuel Pressure (16-bit unsigned integer) This byte indicates the pressure of the engine fuel in units of 1000 Pa. | ||
| + | Byte 10: Reserved (8 bits) This byte is reserved by NMEA; typically, all bits are sent as logical 1. | ||
| + | Byte 11: Engine Discrete Status 1 (16 bits) This byte indicates engine warning states with the following bit assignments (a value of 1 means a warning is present): | ||
| + | Bit 0: Check Engine | ||
| + | Bit 1: Over Temperature | ||
| + | Bit 2: Low Oil Pressure | ||
| + | Bit 3: Low Oil Level | ||
| + | Bit 4: Low Fuel Pressure | ||
| + | Bit 5: Low System Voltage | ||
| + | Bit 6: Low Coolant Level | ||
| + | Bit 7: Water Flow | ||
| + | Bit 8: Water in Fuel | ||
| + | Bit 9: Charging System | ||
| + | Bit 10: Glow Plug Indicator | ||
| + | Bit 11: High Boost Pressure | ||
| + | Bit 12: RPM Limit Exceeded | ||
| + | Bit 13: EGR System | ||
| + | Bit 14: | ||
| + | Bit 15: | ||
| + | Byte 12: Engine Discrete Status 2 (16 bits) This byte indicates additional engine warning states with the following bit assignments (a value of 1 means a warning is present): | ||
| + | Bit 0: Warning Level 1 | ||
| + | Bit 1: Warning Level 2 | ||
| + | Bit 2: Power Reduction | ||
| + | Bit 3: Maintenance Needed | ||
| + | Bit 4: Engine Communication Error | ||
| + | Bit 5: Sub or Secondary Throttle | ||
| + | Bit 6: Neutral Start Protection | ||
| + | Bit 7: Engine Shutdown | ||
| + | Bit 8-15: These bits are reserved and should be masked when reading | ||
| + | Byte 13: Percent Engine Load (8-bit signed integer) This byte indicates the engine' | ||
| + | Byte 14: Percent Engine Torque (8-bit signed integer) This byte indicates the engine' | ||
| Examples of NMEA-compatible maritime devices: | Examples of NMEA-compatible maritime devices: | ||
| - | [[https://veratron.com/pages/marine|NMEA Marine instruments]] | + | [[https://www.nmea.org/|NMEA]] |
en/nmea.1702508138.txt.gz · Last modified: 2023/12/13 23:55 by obd_diagnose
Page Tools
Sponsored by OBD-Shop.
