Maretron ENGINE MONITORING SYSTEM EMS100 사용자 설명서

 

 

 

 
Note: For integer values, the most positive three values are reserved; e.g., for 8-bit unsigned integers, 
the values 0xFD, 0xFE, 0xFF are reserved, and for 8-bit signed integers, the values 0x7D, 0x7E, 0x7F 
are reserved. The most positive value (0xFF and 0x7F, respectively, for the 8-bit examples) represents 
Data Not Available. 
 

 
PGN 127488 – Engine Parameters, Rapid Update 
The EMS100 uses this PGN to transmit rapidly changing engine data. 
 

 

 Field 1:  Engine Instance – (8-bit unsigned integer) This field indicates the particular engine 

for which this data applies. A single engine will have an instance of 0. Engines in 
multi-engine boats will be numbered starting at 0 at the bow of the boat incrementing 
to n going in towards the stern of the boat. For engines at the same distance from the 
bow are stern, the engines are numbered starting from the port side and proceeding 
towards the starboard side. 

 

2:  Engine Speed – (16-bit unsigned integer) This field indicates the rotational speed of 

the engine in units of ¼ RPM. 

 

3: Engine Boost Pressure – (16-bit unsigned integer) This field indicates the 

turbocharger boost pressure in units of 100 Pa. 

 

4:  Engine tilt/trim – (8-bit signed integer) This field indicates the tilt or trim (positive or 

negative) of the engine in units of 1 percent. 

 

5:  Reserved – (16 bits) This field is reserved by NMEA; therefore, the EMS100 sets all 

bits to a logic 1. 

 
PGN 127489 – Engine Parameters, Dynamic 
The EMS100 uses this PGN to transmit more slowly changing engine data. 
 

 

 Field 1:  Engine Instance – (8-bit unsigned integer) This field indicates the particular engine 

for which this data applies. A single engine will have an instance of 0. Engines in 
multi-engine boats will be numbered starting at 0 at the bow of the boat incrementing 
to n going in towards the stern of the boat. For engines at the same distance from the 
bow are stern, the engines are numbered starting from the port side and proceeding 
towards the starboard side. 

 

2:  Engine Oil Pressure – (16-bit unsigned integer) This field indicates the oil pressure of 

the engine in units of 100 Pa. 

 

3: Engine Oil Temperature – (16-bit unsigned integer) This field indicates the oil 

temperature of the engine in units of 0.1°K. The EMS100 does not provide a value for 
this field. 

 

4:  Engine Temperature – (16-bit unsigned integer) This field indicates the temperature 

of the engine coolant in units of 0.1°K. 

 

5:  Alternator Potential – (16-bit signed integer) This field indicates the alternator voltage 

in units of 0.01V.