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8 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
Internal Functions
While most of the information sent and received from the 1939STB will
be transferred to the J1939 bus, the internal function codes allow the user to
set up the serial port, and receive an identity string from the 1939STB. The
identity string may be used to verify that the 1939STB is connected and
working properly.
Vendor String
The vendor string function is sent to the 1939STB as shown in the table
below. This function is strictly internal and can be sent to the 1939STB at
any time whether or not the 1939STB is connected to an active J1939 bus.
The shaded areas are to be set by the user.
After this is sent to the 1939STB the device will respond with:
Table 10. Message Received from the SAE-J1939 Bus
I
D
Function
J1939
Address
MC Data
4
2
28 0
0
0
0
0
0
0
0
00 A
A
xx xx xx xx xx xx xx
A
A
See “Reception of Data” for an explanation of codes.
The xx may change.
The included Visual Basic application has a script file, VENDN.CVS,
that can be sent to the 1939STB to illustrate the vendor string function.
Table 9. Vendor String Setup
Byte 3 Byte 4 Byte 1 Byte 2
Nibble 2 Nibble 1 Nibble 2 Nibble 1
81 21 0010 0000 0000 0001
81 21 20hex 01hex