Template:NMEA2000

Introduction

NMEA 2000 (NMEA2k) is a marine communication standard built on the CAN bus based on SAE J1939 standard. It defines a common network for sharing data between navigation, engine, sensor, and monitoring devices on a vessel. By connecting the {{{model}}} into the marine communication line, depending on the boat equipment you can receive data from the onboard systems such as water depth, wind direction, wind speed etc. as well as engine data (RPM, Oil pressure, fuel rate etc.) from up to 4 engines and information about up to 16 Fluid tanks (Fuel tank 1/2, Fresh water tank, Waste water tank, Oil etc.).

Connection methods

The {{{model}}} device can be connected to your NMEA 2000 network using one of two methods:

Method 1: M12 5-Pin connector

PIN	Function
1	Shield
2	Power source (+)
3	Ground
4	CAN H
5	CAN L

Method 2: NMEA 2000 Backbone wire connection

Connect directly to the backbone using:

• CAN1 H and CAN1 L wires
• Power source connection
• Ground connection

Important Note: The {{{model}}} is not a waterproof device. We strongly recommend installing it inside a custom waterproof enclosure to protect it from marine environments.

Configuration requirements

Network settings

Baudrate: The NMEA 2000 system operates exclusively at 250 kbps.
Termination Resistance: 120Ω termination resistors must be installed at both ends of the network.
{{{model}}} Resistance Setting: Disable the internal CAN resistance on the {{{model}}} to ensure proper network operation.

CAN Bus configuration

Configure the baudrate based on your connection method:

• If using CAN1 lines: Set baudrate to 250 kbps in CAN1 bus settings.
• If using CAN2 lines: Set baudrate to 250 kbps in CAN2 bus settings.

NMEA 2000 Source Configuration

1. Navigate to the NMEA2000 tab.
2. Configure the CAN source according to your physical connection (CAN1 or CAN2).

The “Engine Instance ID” parameter allows selection of a value from 0 to 255. However, according to the NMEA2000 protocol specification, the following values are reserved and should not be used:

• 253 – Reserved
• 254 – Error
• 255 – Not available

I/O Element Configuration

1. Access the NMEA2000 I/O tab.
2. Configure the I/O elements you want to collect from your vessel.
3. In the General/Main window, select desired parameters:

• Fuel fluid levels
• Wind direction
• Water depth
• Additional environmental data

Engine Selection

• Use the engine number selector to choose which engine data to monitor.
• The system supports monitoring up to 4 engines simultaneously.
• Configure each engine's parameters individually as needed.

As an example, the following data is received:
0x11 0x6A 0x19 0x00 0x00 0x00 0x00 0x00

• Instance = (0x11 & 0xF0) >> 4 = 0x10 >> 4 = 1 → Data will be written to Fuel Fluid Level #2
• Type = 0x11 & 0x0F = 0x01 = 1
• Fluid level (raw) = 0x6A 0x19 = 0x1964 = 6500
• Value = 6500 * 4 / 1000 = 26 = 0x1A

If the “low level” or “high level” parameters are not set, the fluid level is calculated as:
Fluid Level = (Type << 12) | Value
= 0x1000 | 0x001A = 0x101A (Decimal: 4122)

But if “low level” or “high level” would be set, Type data will be ignored.

AVL ID lists

General AVL ID Lists

Parameter name	AVL ID
Fuel Fluid Level	10850
Oil Fluid Level	10851
Oil Pressure	10852
Oil Temperature	10853
Engine Temperature	10854
Alternator Voltage	10855
Fuel Rate	10856
Engine Hours	10857
Coolant Pressure	10858
Fuel Pressure	10859
Engine Status 1 Warning	10860
Engine Status 2 Warning	10861
Engine Load	10862
Engine Torque	10863
Water Depth Transducer	10864
Trip Fuel Used	10865
Distance To Empty	10866
Trip Run Time	10867

AVL ID list for engine selection

Parameter Name	AVL ID Engine 1	AVL ID Engine 2	AVL ID Engine 3	AVL ID Engine 4
Oil Pressure	10852	13601	13613	13625
Oil Temperature	10853	13602	13614	13626
Temperature	10854	13603	13615	13627
Alternator Voltage	10855	13604	13616	13628
Fuel Rate	10856	13605	13617	13629
Hours	10857	13606	13618	13630
Coolant Pressure	10858	13607	13619	13631
Fuel Pressure	10859	13608	13620	13632
Status1 Warning	10860	13609	13621	13633
Status2 Warning	10861	13610	13622	13634
Load	10862	13611	13623	13635
Torque	10863	13612	13624	13636
RPM	14216	14217	14218	14219

[[Category:{{{model}}} Manual]]