The notes provide general information, which will be helpful for the reader to
The warnings indicate a potentially dangerous situation, which could result in
are not
Be aware of the hazardous live currents and voltages. Do not touch any AC
Option J – CANbus J1939
1. Warnings and legal information
Legal information and responsibility
Thomson Technology takes no responsibility for installation or operation of the engine set. If there is
any doubt about how to install or operate the engine controlled by the unit, the company responsible
for the installation or the operation of the set must be contacted.
The units are not to be opened by unauthorized personnel. If opened anyway, the
Electrostatic discharge awareness
Sufficient care must be taken to protect the terminals against static discharges during the
installation. Once the unit is installed and connected, these precautions are no longer necessary.
Installing the unit implies work with dangerous currents and voltages. Therefore, the installation should
only be carried out by authorised personnel who understand the risks involved in working with live
electrical equipment.
measurement inputs as this could lead to injury or death.
warranty will be lost.
Safety issues
Factory settings
The unit is delivered with certain factory settings. Given the fact that these settings are based on
average values, they are not necessarily the correct settings for matching the individual engine.
Thus precautions must be taken to check the settings before running the engine.
Definitions
Throughout this document a number of notes and warnings will be presented. To ensure that these
are noticed, they will be highlighted in order to separate them from the general text.
Notes
Warning
bear in mind.
death, personal injury or damaged equipment, if certain guidelines
followed.
PM077 R1 09/08/20 Page 1 THOMSON TECHNOLOGY
MEC 310 GENSET CONTROLLER -
Modbus Communications’ for the
Multi functional
L3
Option J – CANbus J1939
2. Description of option
Option J
This manual describes option J for the MEC 310 controller. The option gives the possibility to
communicate between the MEC 310 and several engine types over the CANbus network.
Terminal description for MEC 310
Term. Function Description
53 CAN-H
54 CAN-GND
55 CAN-L
An overview of the terminals can be seen below. The slots are positioned in the unit as follows (rear
of the unit):
1 2 3 4 5 6 7 8
+ 0 1 2 3
DC
Power
com
Status
9 10 11 12 13 14 15 16 17 18
com
1 2 3 4 5 6
Binary inputs
Tacho com Tacho w/capacitor
Mains Voltage
L1 N L2 NA L3
28 29 30 31 32
Generator Voltage
L1 N NA L2 NA L3
33 34 35 36 37 38
CAN 1
19 20 21 22 23 24 25 26 27
com
E-Stop
Can 1 J1939
Option J
Generator Current
L1
L2
39 40 41 42 43 44
45 46
Can H
com
Can L
47 48
Term. 53: CAN-H
Term. 54: CAN common
Term. 55: CAN-L
49
50
51
52
53
54
55
56
57
58
59
RS485
modbus
(option M)
Can 1
Option J
Can 2
TX
com
RX
Can H
com
Can L
Can H
com
EAP
Can L
If option M is present in the MEC 310 unit it’s possible to read engine data over the Modbus.
Please refer to the document ‘Option M –
relevant MEC 310 unit.
PM077 R1 09/08/20 Page 2 THOMSON TECHNOLOGY
Modbus communication
MEC 310: For wiring details, please refer to the document ‘Installation
Engine
Communication
Module
ECM
CAN bus port
CAN - H
GND
CAN - L
R = Z cable
Ground cable screen in one end only
R = Z cable
CAN -
H
GND
CAN - L
Engine controller
MEC 310
535455
PLC (or computer),
Monitoring system)
Instructions and Reference Handbook’.
Principle diagram
Connection diagram:
MEC 310 GENSET CONTROLLER -
Wiring
Display
Option
ECM
Generator set
MEC 310
Option J – CANbus J1939
Option
AMS (Alarm- and
PM077 R1 09/08/20 Page 3 THOMSON TECHNOLOGY
MEC 310 GENSET CONTROLLER -
For support of controller/engine types not listed, please contact Thomson
tions’ for details of
Option J – CANbus J1939
3. Functional description
This communication extracts information from the Electronic Control Module (ECM) of an engine
equipped with an ECM module with CANbus interface. The values can be used as display values,
alarms/shutdown alarms and values to be transmitted through Modbus.
Engine types
Data can be transmitted between the MEC 310 units and the following engine controllers/types:
Detroit Diesel DDEC III and IV/Series 50, 60 & 2000
Deutz EMR 2 (EMR)/912, 913, 914 and L2011 Rx/Tx
Rx/Tx
Rx/Tx
Rx/Tx
- General J1939
Iveco EDC7 (Bosch MS6.2)/Series NEF,
CURSOR and VECTOR 8
John Deere JDEC/PowerTech M, E and Plus
MTU MDEC, module M.302 or M.303/Series
2000 and 4000
MTU MDEC, module M.201 or M.304/Series
2000 and 4000
MTU ADEC/Series 2000 and 4000
Perkins Series 1100, 1300, 2300 and 2800
Scania EMS
Scania EMS S6 (KWP2000)/Dx9x, Dx12x,
Dx16x
Volvo Penta EDC4 Rx
Volvo Penta EMS
Volvo Penta EMS 2 and EDCIII/D6, D7, D9, D12 and
D16 (GE and AUX variants only)
Rx/Tx: Please go to the section ‘Specific engine type descrip
data read and write.
The engine type is selected in menu 7561.
Rx/Tx
Rx/Tx
Rx/Tx
Rx
Rx
Select M.303
Rx/Tx
Rx/Tx
Rx
Rx/Tx
Select EMR 2
Rx
Rx/Tx
Technology.
PM077 R1 09/08/20 Page 4 THOMSON TECHNOLOGY
MEC 310 GENSET CONTROLLER -
Option J – CANbus J1939
Communication system
All these protocols are based on a CANbus communication system. Except for the MDEC and
ADEC communication, all of them are based on the J1939. The MDEC and ADEC protocols are
MTU designed protocols based on CANopen.
The baud rate is fixed by the engine manufacturer at:
MDEC, ADEC Caterpillar, Cummins, Detroit Diesel, Deutz, Iveco, John Deere, Perkins,
Scania and Volvo Penta
125 kb/s 250 kb/s
EIC unit
The selection of the EIC unit (menu 10970) determines whether bar/PSI and Celsius/Fahrenheit is
used. The selection affects display readings, values used for alarm evaluation (menu 76xx) and
data readable by Modbus communication (option M).
Common for all alarm functions
A number of alarms can be configured.
The following items can be configured to an alarm:
Menu number Alarm
7570 EI comm. error
7580 EIC warning Any alarm listed as warning for
7590 EIC shutdown
7600 EIC overspeed Actual RPM
7610/7620 EIC coolant t. (2 levels) Actual temperature
7630/7640 EIC oil press. (2 levels) Actual pressure
7650/7660 EIC oil temp. (2 levels) Actual temperature
Comment
Communication error
the selected engine type in the
section ‘Specific engine type
descriptions’.
Any alarm listed as shutdown for
the selected engine type in the
section ‘Specific engine type
descriptions’.
PM077 R1 09/08/20 Page 5 THOMSON TECHNOLOGY
MEC 310 GENSET CONTROLLER -
the menu structure, please see the Installation and
Option J – CANbus J1939
J1939 measurement table
This is the common J1939 measurement overview showing which measurements are available.
Note that not all measurements are supported by the individual engines; please refer to the specific
engine description.
The table shows which values can be displayed in the view screens.
The display values corresponding to the engine communication have a description beginning with
‘EIC’.
Error messages
The following error messages can occur:
Message Description
Engine I. value N.A. The view is not selectable for the present engine type.
Value selected error The value cannot be read due to sensor error, sub-system or
‘N.A.’ The value is not supported by the engine, or due to
For information about
Operation Manual.
module error.
communication error.
PM077 R1 09/08/20 Page 6 THOMSON TECHNOLOGY
MEC 310 GENSET CONTROLLER -
Option J – CANbus J1939
Object selection, J1939
The view lines can be configured with these available values.
For Modbus scaling, please see the table on page 39.
EIC engine trip fuel 65257 6 1 4
EIC engine total fuel
used
65257 6 5 4
Length (bytes)
Start position
st
SPN no.
Unit
J1939-71 scaling
107
kPA 0.05 kPA/bit, offset 0
112
kPA 0.5 kPA/bit, offset 0
108
kPA 0.5 kPA/bit, offset 0
171
1039
1040
182
250
C
°
0.03125 oC/bit, offset -273 oC
kg 0.5 kg/bit, offset 0
kg 0.5 kg/bit, offset 0
L 0.5 L/bit, offset 0
L 0.5 L/bit, offset 0
For the Iveco Vector 8 type only:
(*1): EIC coolant temp.: PGN=65282, priority=6, start at byte 5, length=1byte, SPN=110, same
scale
(*3): EIC oil temp.: PGN=65282, priority=6, start at byte 6, length=1byte, SPN=175, same scale
(*2): EIC oil pressure. PGN=65282, priority=6, start at byte 7, length=1byte, 8kPa/bit gain, 0kPA
offset, data range: 0 to +2000 kPA
The ob
Verification of J1939 objects
To verify the communication, various CAN PC tools can be used. Common for these are that they
must be connected to the CANbus between the MEC 310 unit and the engine controller. When the
tool is connected, it is possible to monitor the communication between the two units. For use of the
CAN tool, please refer to the manual for the product used.
As an example, you may see the following telegram:
0xcf00400 ff 7d 7d e0 15 ff f0 ff
DATA BYTE: 1 2 3 4 5 6 7 8
- 0xc is the priority
- f004 is the PGN number (61444 in decimal value)
- The 8 bytes following the CAN ID (
0xcf00400
The priority needs to be converted to decimal. Note that the 3 priority bits in this case are displayed
in the CAN id (You see 0xcf00400 instead of 0x0cf00400). In other cases you may read e.g.
0x18fef200 (PGN 65266).
PM077 R1 09/08/20 Page 8 THOMSON TECHNOLOGY
) are data, starting with byte 1
MEC 310 GENSET CONTROLLER -
Option J – CANbus J1939
The formula to find the priority number (P) is to divide by 4:
Normally in SAE J1939, only priority 3 and 6 are used.
Hereafter the data can be read (PGN 61444):
0xcf00400 xD ff 7d 7d e0 15 ff f0 ff
Engine torque (Data byte 1) ff Not available
Driver demand torque (Data byte 2) 7d
Actual engine torque (Data byte 3) 7d
Engine speed (Data byte 4) e0
Engine speed (Data byte 5) 15
Source address (Data byte 6) ff Not available
Engine starter mode (Data byte 7) f0
Engine Demand (Data byte 8) ff Not available
Calculation example:
RPM resolution is 0.125 RPM/bit, offset 0.
The result is then 15e0 (Hex) or 5600 (dec)*0.125 = 700 RPM.
PM077 R1 09/08/20 Page 9 THOMSON TECHNOLOGY
MEC 310 GENSET CONTROLLER -
FMI 17
Option J – CANbus J1939
Displaying of J1939 DM1/DM2 and Scania KWP2000 alarms
Besides some engine specific alarms which are shown in the standard alarm list, the J1939
Diagnostic messages DM1 (active alarms) and DM2 (historic alarm log list) as well as the Scania
KWP 2000 alarms can all be shown on the display.
MEC 310
J1939
Use the up or down buttons until the DM1 or DM2 is shown in the display and press enter. The
alarm log will be shown in the display.
Example:
The alarm log in DM1 shows the active alarms, the DM2 shows the historical alarms.
Use the up and down buttons to scroll through the list.
DM1 LOG DDEC
Oil pressure
Low level warning
SPN 100
Scania KWP 2000
Use the up or down buttons until the engine log is shown in the display and press enter. The alarm
log will be shown in the display.
Example:
Scania KW2000 LOG
1105 Speed sensor 1
Active alarms: 6
The Scania KWP 2000 log shows active and passive alarms in a mix.
Use the up and down buttons to scroll through the list.
PM077 R1 09/08/20 Page 10 THOMSON TECHNOLOGY
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