MEC 310 GENSET CONTROLLER -
Option J – CANbus J1939
PM077 R1 09/08/20 Page 32 THOMSON TECHNOLOGY
6. Modbus communication
This chapter is to be considered as additional information for option M (Modbus RS 485 RTU).
Please refer to the ECM (Engine Communication Module) user manuals for more information about
the ECM protocol technical description and the details of each communication value.
If option M is installed, then the data can be transmitted to a PLC, a computer, the alarm-and-
monitoring system or a Scada system.
A certain amount of engine data can be transmitted from the engine communication module to the
controller unit. They can be transmitted through Modbus option M.
The available values depend on the selected type of engine communication.
The data readable by the Modbus communication are converted into the chosen unit in menu
10970.
Reading of analogue values
The reading of values is independent of engine type, so all readings below are available in the
Modbus protocol.
The availability of data from the individual engine types is dependent on the specific engine. Please
refer to the engine manual in question.
These data refer to the common J1939 display reading list as well as the overview of readings in
the MTU ADEC (CANopen) and MTU MDEC (MTU protocol).
Measurement table (read only) function code 04h.
Scaling Addr Content Unit
J1939 ADEC MDEC
Description
593 EIC speed [RPM] 1/1 1/1 1/1 Speed
594 EIC coolant temp. [deg] [F] 1/1 1/10 1/10 Coolant
temperature
595 EIC oil pressure [bar] [psi] 1/100 1/100 1/100 Engine oil
pressure
596 EIC no of faults [Faults] 1/1 1/1 1/1 Number of faults
597 EIC oil temp. [deg] [F] 1/10 1/10 1/10 Engine oil
temperature
598 EIC fuel temp. [deg] [F] 1/1 1/10 1/10 Fuel temperature
599 EIC intake
manifold #1 P
[bar] [psi] 1/100 1/100 - Intake
manifold #1 P
600 EIC air inlet temp. [deg] [F] 1/1 - - Air inlet
temperature
Please refer to the option M technical documentation for more information about
our standard external Modbus communication.
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