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D-500 MK2 User Manual
26. J1939 CANBUS ENGINE SUPPORT
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:
PGN 65253 / SPN 247 Engine Total Hours of Operation
PGN 65257 / SPN 250 Engine Total Fuel Used
PGN 65262 / SPN 110 Engine Coolant Temperature
/ SPN 174 Engine Fuel Temperature 1
/ SPN 175 Engine Oil Temperature 1
PGN 65263 / SPN 100 Engine Oil Pressure
/ SPN 94 Engine Fuel Delivery Pressure
/ SPN 98 Engine Oil Level
/ SPN 101 Engine Crankcase Pressure
/ SPN 109 Engine Coolant Pressure
/ SPN 111 Engine Coolant Level
PGN 65266 / SPN 183 Engine Fuel Rate
/ SPN 184 Engine Instantaneous Fuel Economy
/ SPN 185 Engine Average Fuel Economy
PGN 65269 / SPN 108 Barometric Pressure
/ SPN 171 Ambient Air Temperature
/ SPN 172 Engine Air Inlet Temperature
PGN 65270 / SPN 102 Engine Turbocharger Boost Pressure
/ SPN 105 Engine Intake Manifold 1 Temperature
/ SPN 106 Engine Air Inlet Pressure
/ SPN 107 Engine Air Filter 1 Differential Pressure
/ SPN 173 Engine Exhaust Gas Temperature
PGN 65271 / SPN 158
PGN 61443 / SPN 92 Engine Percent Load At Current Speed
/ SPN 91 Accelerator Pedal Position 1
PGN 61444 / SPN 190 Engine Speed
/ SPN 513 Actual Engine - Percent Torque
/ SPN 512 Driver's Demand Engine - Percent Torque
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.
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Firmware V-6.3
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