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.
Table 9. Vendor String Setup
Byte 1 | Byte 2 |
| Byte 3 |
|
| Byte 4 |
|
|
| ||
|
|
| Nibble 2 |
| Nibble 1 |
|
| Nibble 2 |
| Nibble 1 |
|
81 | 21 |
| 0010 |
| 0000 |
| 0000 |
| 0001 |
| |
81 | 21 |
|
| 20hex |
|
| 01hex |
|
|
| |
After this is sent to the 1939STB the device will respond with:
Table 10. Message Received from the SAE-J1939 Bus
I | Function | J1939 |
|
| MC | |
D |
| Address |
|
| ||
4 | 28 | 0 | 0 | 0 | 0 | 00 |
2 |
| 0 | 0 | 0 | 0 |
|
A A
Data
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.
8 | 1939STB4600 Manual |
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91 792444 – Fax +353 91 792445