Measurement-computing DBK70 Manuel d'utilisateur télécharger pdf (Page 75)

DBK70 User’s Manual 928494 Fundamentals of Obtaining Vehicle Data 6-9

During the definition process, multiple messages are sent to the target module to construct a DDP.

Each definition message adds another data item to the user-defined DDP. The following diagram shows

how to derive a DBK70 Message from the information provided in the J2190 document. This example uses

the DDP definition message to add the 1

data item to a newly defined DDP, Data Packet ID #1 (DPID#).

Sending this message will add engine RPM, a 2 byte data item, to data packet #1.

Transmit additional DDP definition messages, in the same manner, to add more data items to DPID #1.

The following diagram illustrates how another data item is added to DPID #1. At this point, DPID #1

already contains RPM, a 2 byte value, so we’ll offset the data for this next data item by 2 bytes, starting

it at an offset of 3.

1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 107 108

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Measurement-computing DBK70 Manuel d'utilisateur Page 75