·
The second section shows the bytes as they will appear in the display's address
claim message on CAN bus. This section can only be edited in hexadecimal format.
·
The lower section shows the resulting J1939 as 64 bit number. Like the section
above this one can only be edited in hexadecimal format.
In the following we describe the J1939 name configuration based on the fields as shown in
the upper section. If desired it could also be done in the other sections and all three will
always be synchronized.
1. The "Arbitrary Address Capable" bit is automatically set according to your selection
of "static" or "dynamic" address claim in the dialog before.
2. "Industry Group" 0 is applicable to all industries. More specific groups can be found
in table B1 of the main J1939 document.
3. "Vehicle System Instance" is defined in J1939-81 as "Vehicle System Instance is a
4-bit field that is used to identify a particular occurrence of a particular
Vehicle System within a connected network." and 0 refers to the first instance.
4. "Vehicle System" could e.g. identify "tractor" or "trailer"; 0 refers to "Non-specific
System" according to main J1939 document.
5. "Function" 0x3c == 60 refers to "Cab Display". Other options can be found in table
B11 and B12 of the main J1939 document.
6. "Function Instance" differentiates ECUs implementing the same function. 0 refers to
the first instance.
7. "ECU Instance" allows separating different ECUs belonging to the same function and
function instance. 0 refers to the first ECU instance.
8. "Manufacturer Code" has a default value. Other codes can be found in table B10 of
the main J1939 document.
9. "Identity Number" should allow differentiating two similar devices connected to the
same network. One can keep this as "0x00" since the display will automatically fill it
with a 21 bit number calculated from device part number and serial number.
Finally press "OK" to confirm the setting and close the dialog.
5.3.2
The display has to identify every ECU it should communicate with.
·
In a static network the source address of each ECU is sufficient for this purpose.
·
For networks using dynamic address claim each ECU has to be identified by its
J1939 name.
The main purpose of the ECU configuration is to use these ECUs as variable owners.
Note: The display will request an address claim if it finds an unknown source address on
the bus. If there should be an ECU that does not answer this request, it should be
configured here even if it does not otherwise communicate with the display.
Creating an ECU with static Address
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