DKG-379 User Manual Rev_02
V-15
(24-12-2012)
K43D01-EN - 74 -
The unit offers a special J1939 port in order to communicate with electronic engines controlled by an
ECU
(electronic control unit). The J1939 port consists of 2 terminals which are
J1939+
and
J1939-
.
The connection between the unit and the engine should be made with an appropriate balanced 120 ohms
low capacitance coaxial cable. The external conductor should be grounded at one end only.
A
120 ohms
termination resistor is installed inside the unit. Please do not connect external resistor.
The J1939 port is activated by setting the program parameter
J1939 Enable
to
1
. The
J1939 Engine
Type
parameter should be set accordingly. The list of available engines is given at the programming
section. Please contact DATAKOM for the most current list of engines.
If the J1939 port is enabled then the
oil pressure
,
coolant temperature
and the
engine rpm
information
are picked up from the
ECU
unit. If connected, the MPU unit and related analog senders are discarded.
The controller is able to read and display all below parameters, under condition that the engine sends
these information. Most engines send only some of them. If the engine does not send a parameter, the
unit will simply skip it. Thus only available information are displayed.
The complete list of J1939 display parameters is below:
1. Engine Brand, ECU Type, J1939 SW version
2. Engine Coolant Level
3. Engine Oil Level
4. Engine Coolant Pressure
5. Engine Fuel Delivery Pressure
6. Barometric Pressure
7. Engine Crankcase Pressure
8. Engine Turbocharger Boost Pressure
9. Engine Air Inlet Pressure
10. Engine Air Filter1 Differential Pressure
11. Engine Fuel Temperature
12. Ambient Air Temperature
13. Engine Air Inlet Temperature
14. Engine Intake Manifold1 Temperature
15. Engine Exhaust Gas Temperature
16. Engine Fuel Rate
17. Engine Instantaneous Fuel Economy
18. Engine Average Fuel Economy
19. Engine Total Fuel Used
20. Engine Total Hours
21. Engine Percent Load at Current Speed
22. Actual Engine Percentage Torque
23. Drivers Demand Engine Percentage Torque
24. Accelerator Pedal Position
24. Battery Potential Switched
The J1939 measurements are also available for Modbus operation. Please check chapter
Modbus
Communications
for more details.
When the fuel output is active, if no information is received from the ECU during last 3 seconds, then the
unit will give a
ECU FAIL
alarm and stop the engine. This feature prevents uncontrolled engine operation.
The
fault conditions of an electronic engine
are considered by the unit as
warnings
and do not cause
engine stop. The engine is supposed protected by the ECU which will stop it when necessary.
The electronic engine
fault codes
are displayed
in text
within the alarm list table, together with their
SPN-FMI
co
des. The complete list of fault codes is given in the engine manufacturer’s user manual.
17. J1939 CANBUS ENGINE SUPPORT
