<< Click to Display Table of Contents >> J1939 ECUs and Variables |
This page is a follow-up of the general introduction into J1939 and the general setup required to use J1939.
Here we create J1939 ECUs and their variables.
There is one more page describing setup of J1939 PGN mappings.
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.
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As mentioned above we mainly configured the J1939 ECUs because they own some variables whose values we want to show and/or modify on display. Before we can use these variables we have to do two things: 1.Create the variables and use one of the J1939 ECUs as owner. 2.Define the PGNs we want to use to send and receive the variables.
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