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1939STB4600 Manual 19
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
SAE-J1939 Control Header
Bytes 7 though 10 are the bytes that set the header information
(“Arbitration Field” in the following table) for the SAE-J1939 bus. The areas
shown in Table 27 in dark gray are set by the CAN specification and are
NOT modified by SAE-J1939.
Table 27. J1939 Message Frame
ARBITRATION FIELD CONTROL DATA CRC ACK EOF
S
O
F
Identifier
(11 Bits)
S
R
S
I
D
E
Identifier
Extension
(18 Bits)
R
T
R
R
1
R
0
D
L
C
1 11 Bits 1 1 18 Bits 1 6 Bits 64 Bits 16 Bits 2 Bits 7 Bits
The frame above shows the entire J1939/CAN frame.
Table 28 on the following page shows the Arbitration field in detail.
Dark gray areas are part of the CAN standard and are set by the controller.
The double black lines separate the CAN message identifiers (upper part)
from the SAE-J1939 message identifiers (lower part). The area between the
black lines highlighted in dark gray/white letters shows the bytes that must be
entered to set up the SAE-J1939 message header. In the back of the manual
you will find a worksheet, (Appendix A) and an example (Appendix B) to
help set up the message header.