Function
This is used to show where the message came from. Refer to Table 37. If the Nibble 2 is set to 0, then the message is from the J1939 bus. If Nibble 2 is set to 2, it is an internal message (for example, Vendor ID).
Table 38. MC
|
| Nibble 2 |
|
| Nibble 1 |
| ||
Bit 7 | Bit 6 |
| Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
MC
This is a byte from the controller. Nibble 2 is the number of data bytes (0-
8)in the message. Nibble 1, Bit 3 is the message direction. Bit 2 should always be set to 1. Bit 1 and 0 are not used.
30 | 1939STB4600 Manual | |
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| B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91 792444 | – Fax +353 91 792445 |
