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30 1939STB4600 Manual
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91 792444 – Fax +353 91 792445
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).
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.
Table 38. MC
Nibble 2 Nibble 1
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0