Basler Electric DGC-2020HD - Manual (Page 257)

9469300990 Rev B 247
CAN Bus Setup
BESTCOMSPlus ® Navigation Path: Settings Explorer, Communications, CAN Bus, CAN Bus Setup
HMI Navigation Path: Settings > Communication > CAN Bus 1 (I/O) Setup and CAN Bus 2 (ECU) Setup
The following paragraphs describe the settings found on the CAN Bus Setup screen. Figure 157
illustrates the BESTCOMSPlus CAN Bus Setup screen. Settings are listed in Table 71.
Enable ECU Support
Set to Enabled for the DGC-2020HD to communicate with the ECU.
Enable DTC (Diagnostic Trouble Code) Support
If the ECU is a J1939 ECU, enable DTC support. If the ECU does not support it, no diagnostic trouble
codes will be logged by the DGC-2020HD.
SPN Conversion Method
Early versions of the J1939 specifications were unclear about how the 19 bits of the SPN were arranged
within their allocated places in the data. While it was clear which bytes and bits contained the 19 bits of
SPN data, it was not clear whether the data within the bytes was arranged with the most significant bit
first or least significant bit first. It was also unclear which byte was most significant and which was least
significant. The ambiguity led to various engine manufacturers adopting three different methods of
converting the data into SPN numbers.
This was remedied in the J1939 specs, and the SPN Conversion Method bit was added. When this bit is a
zero, the conversion method is indicated as version 4. The DGC-2020HD will automatically set the
conversion method to 4 when the CM bit is zero; this occurs for most engine types. However, if the CM bit
is 1, indicating the SPN conversion method is NOT 4, the user will have to consult the engine
manufacturer to learn the correct method of SPN conversion, and set the SPN Conversion Method setting
in the DGC-2020HD accordingly.
A DGC-2020HD operating on a CAN bus network is identified by a unique address number. The CAN bus
address is set internally by the DGC-2020HD when certain types of ECUs are selected on the ECU Setup
screen, and in this case, the user-entered value does not apply. See Table 69.
Table 69. CAN Bus Address per ECU Type
ECU Type CAN Bus Address
Standard User-selectable
Volvo Penta 17
MTU MDEC 6
MTU ADEC 1
MTU ECU7/ECU8 6
GM/Doosan User-selectable
Cummins 220
MTU Smart Connect 234
In applications where the ECU is not continuously powered, the DGC-2020HD has provisions for applying
power to the ECU and pulsing the ECU to update its engine monitoring data. Either the DGC-2020 RUN
or PRESTART relay output can be used to apply power to the ECU. If the PRESTART contact is
selected, the RUN output will still close during cranking and genset operation to provide a separate
indication that the genset is running. For applications where pulsing of the ECU is not desired, this pulsing
feature can be disabled.
The most common SPN conversion method is 4 and is the default for the DGC-2020HD. Refer to ECU
manufacturer documentation to determine the correct SPN conversion method of the ECU and set the
SPN Conversion Method setting in the DGC-2020HD accordingly.
DGC-2020HD Communication