B&B Electronics RS-232 to J1939 Converter CE 1939STB User Manual
Page 30
28 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
Data Field
The next 8 bytes are the data field and can have from 0 to 8 bytes used.
This is the data payload.
Table 35. 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 remaining fields are handled by the controller and are not accessible
through the converter.