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J1939 SA |
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| In SAE J1939, the acronym SA stands for Source Address and represents the address of a controller application. A source address is 8-bits wide and is included in every J1939 message. Also, every J1939 controller application (i.e. ECU), has a unique SA. |
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| J1939 requires every CA to have a unique source address (SA) to guarentee that all CAN identifiers are unique. This is a requirement of the CAN Bosch specification and is required for correct CAN functionality. J1939-81 specifies an address claim procedure which details what steps should be taken if more than one controller application (CA) has the same source address (SA). |
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J1939 SA Example
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| 0: | Engine #1 |
| 1: | Engine #2 |
| 3: | Transmission #1 |
| 4: | Transmission #2 |
| 5: | Shift Console - Primary |
| ... : | ... |
| 254: | Null |
| 255: | Global - All CAs |
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