7.7.38. J1939 DM24 transmit (pj1939_Dm24Transmit)
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7.7.38. J1939 DM24 transmit (pj1939_Dm24Transmit)

Transmit a J1939/73 DM24 message identifying supported SPNs.

7.7.38.1. Supported targets

All targets

7.7.38.2. Required license

EXT_DIAG (Extended diagnostics library). (See Section 2.3, “Licensed Features”.)

7.7.38.3. Description

A J1939/73 DM24 message is a variable length message. It identifies which SPNs support Data Streams, Scaled Test Results, and Expanded Freeze Frames (DM25).

The Data Stream SPNs are simply those ppid_Pid blocks with SPN IDs defined. The Scaled Test Result SPNs are those defined in the ppr_DiagnosticTestEntity blocks. The DM25 SPNs are specified by the calibration identified in the pff_Dm25FreezeFrame block.

Note: for Data Stream SPNs the application still has to create the message responses for the corresponding PGNs itself, using the pj1939_PgTransmit block.

7.7.38.4. Inports

  • sim_error_flag

    The simulation inport for the error_flag outport.

    Value type:Boolean
    Calibratable:No

  • sim_transport_errors

    Simulation value of the outport transport_errors.

    Value type:Integer
    Calibratable:No

  • transmit

    Set to 1 to transmit a DM24 message, set to zero otherwise.

    Range: 0 or 1.

    Value type:Boolean
    Calibratable:No

  • priority

    J1939 priority of the DM24 message to be transmitted.

    Range: [0, 7]

    Value type:Integer
    Calibratable:No

  • dest_addr

    J1939 destination address for the DM24 message (This could be the source address of the corresponding PGN request, or the global address (255) if the request was sent to the global address). If use_dest_addr is false or a PDU2 message is shorter than 9 bytes, this value is ignored and the message is sent to the global address.

    Range: [0, 255]

    Value type:Integer
    Calibratable:No

  • use_dest_addr

    Whether to send the DM24 to a specified destination address. If false (0), the message will always be sent to the global address. Set to true (1) to allow the message to be sent to a specific destination address, such as the source address of a PGN request.

    Range: 0 or 1.

    Value type:Boolean
    Calibratable:No

7.7.38.5. Outports

  • error_flag

    Set to 1 when the DM24 message could not be buffered for transmission, or if a previous request to send a DM24 message has not completed.

    Value type:Boolean
    Calibratable:No

  • transport_errors

    Saturated count of transport errors (timeout or aborts) for this message.

    Range: [0, 255]

    Value type:Integer
    Calibratable:No

7.7.38.6. Mask parameters

  • J1939 Channel

    The logical J1939 channel on which to transmit. Must be a channel declared with a pj1939_ChannelConfiguration block.

    Value type:Integer
    Calibratable:No

7.7.38.7. Notes

None.

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7.7.37. J1939 DM21 transmit (pj1939_Dm21Transmit) Home 7.7.39. J1939 DM25 transmit (pj1939_Dm25Transmit)