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A-2 1939STB4600 Manual Appendix A
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
Arbitration Field
S
O
F
Priority
3 Bits
R
1
*
D
P
PDU Format (PF)
8 Bits
S
R
S
I
D
E
PF
Cont.
PDU Specific
8 Bits
Source Address
8 Bits
(See note below.)
R
T
R
X 1 1 0 0 0 1 1 1 1 0 0 X X 0 0 0 0 0 0 0 1 1 0 X
X
1 2 4 5 6 7 8 9 10 11 12
X X
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
X
X Byte 7 Byte 8 X X Byte E 8 cont. Byte 9 Byte 10 X
X 7 6 5 4 3 2 1 0 7 6 5 X X 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 X
X X X X
X X X X
* R1 is the reserved bit. ALL messages should set the SAE reserved bit to 0 on transmit.
The frame above represents the J1939 frame and shows how the data is coded, to be entered into the frame.
The bits marked with an X are set by the controller and are NOT settable by the user and can be ignored.
The easiest way to fill this out is to start at SOF bit, fill in the priority bits (3), the R1 bit, the data page DP bit and so on.
After all 30 bits are set, break apart the bits in bytes following the separation highlighted in gray.
The bytes are converted to hex and can be entered into the communication program provided by B&B as follows:
NOTE: The bytes in the rest of the message (bytes 3, 4, 5, 6, and 11) must be filled out for the message to operate properly.