J1708 Commands
Receiving Data from the J1708 Bus
After the HDV100A3 is set into its Intelligent mode of operation and the
Byte | Byte Value | Byte Function |
Number | (hex) |
|
1 | 01 | Start of frame |
2 | 02 | The number of control bytes |
3 | 01 | ID byte 01= J1708 |
4 | 11 | Function code 11 hex start receive |
5 | 00 | Number of data bytes (00 place holder) |
6 | 15 | Checksum (bytes 1 through 5 added together) |
After sending this command to the device, the device will respond with a confirmation message. The message confirms that the command was received by the HDV100A3 and the checksum verified correctly. The reply from the device is formatted as follows:
Byte | Byte Value | Byte Function |
Number | (hex) |
|
1 | 01 | Start of frame byte |
2 | 01 | Control byte |
3 | 01 | ID byte (ID of the sent message) |
4 | 00 | Number of data bytes |
5 | 03 | Checksum |
The confirmation message is sent in response to a command sent to the device. The ID byte and the
To stop receiving data from the J1708 bus send the following command to the HDV100A3.
12 | HDV100A3 Command & Response | |
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PH (815) | FAX (815) |