A53 Z0 9 0020 L En Technical documentation
15.3.2
COM2
:
Communication J1939
J1939 is a CAN protocol used with modern electronic ECU. It allows reading engine data (oil pressure, water
temperature…) and sending commands (start, stop, speed control…).
1/ Setting
In order to use the J1939 communication on the COM2 port:
Enter in « Configuration/Engine/J1939-MDEC » menu
In the list, select the manufacturer [E4034].
Select the ECU type [E4068] according to the manufacturer
Set the Alarm/fault (See below)
Connect the CAN bus between the engine ECU and the COM2 port of the GENSYS 2.0 (see §15.1 for
more details)
The internal configuration of the module will be directly set according to the manufacturer/ECU pair:
GENSYS 2 .0 address [E1856]
ECU address [E1013]
Oil pressure measure by J1939 or by analogue sensor [E1852]
Water temperature measure by J1939 or by analogue sensor [E1853]
Engine speed measure by J1939 or by analogue sensor [E1854]
Speed control by J1939 or by analogue output
Start/stop control by J1939 or by the Fuel/Cranck relays
Note: The speed command by J1939 or by analogue sensor depends on ECU. (See below to know the speed
control used by default)
After selecting Manufacturer/ECU pair, these parameters can be modified according to your need.
Measure from analogue sensor (F8-F9)
Water temperature
[E1853]
Measure from analogue sensor (F6-F7)
Mesure pick-up (G7-G8) or alternator
Table 63 - J1939: Analog measure or J1939
Notes:
GENSYS 2.0 can communicate with a large number of J1939 engines. The list is steadily increasing, please
contact CRE Technology or your local distributor if your engine is not mentioned in this document.
The speed communication is fixed to 250kbits/s.
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