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1939STB4600 Manual 13
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
External Commands
The SAE-J1939 format is based on the CAN extended data frame. A
detailed breakdown of the data frame is shown in Appendix A.
The arbitration field is changed to conform to the SAE-J1939 message
frame. The message frame must be broken down further before it can be sent
to the 1939STB.
The format for transmitting data to the 1939STB is shown in the
following table:
The message sent to the converter is formatted as shown above. The
format is divided into three sections. Each section performs a specific
function as follows:
Bytes 1 through 4 (B1-B4) are internal commands for the converter.
These bytes tell the converter if the following message is intended for the
SAE-J1939 bus, the slot where the message should be stored on the
1939STB, and the length of the data payload.
Bytes 5 through 11 are for message control - if it is to be transmitted
(data frame) or received (remote frame). This area contains the J1939
message information: priority, data page, PDU format, PDU specific, and
source address. The last section is the data section. This is the data that will
be sent to, or received from, the bus. It may contain 0 to 8 bytes.
Table 18. J1939 Format
Message Header Message Information Data Payload
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
B
9
B
1
0
B
1
1
B
1
2
B
1
3
B
1
4
B
1
5
B
1
6
B
1
8
B
1
9
B
2
0
8
1
2
1
1
F
0
5
9
5
E
7
0
c
8
0
0
0
4
0
8
c
4
1
4
2
4
3
4
4
4
5
4
6
4
7
4
8