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1 Read the data service according to the identifier ($22)

The read data service according to the identifier is used to read the data record value determined by the data identifier from the memory of the electronic control unit . According to the support of the electronic control unit , These data records may include analog input and output signals 、 Digital input and output signals 、 Internal data and system status information .

The request message of this service only supports 1 Data identifiers . The length of the positive response message is related to the data length determined by the data identifier . When receiving a request to read data according to the identifier , The electronic control unit is responsible for parsing the address information and data length determined by the data identifier , And send the data value to the test tool .

1.1 Request message

Read the request message of data request service according to the identifier, as shown in table 1.

surface 1 Read the request message of data service according to the identifier

1.2 Positive response message

Read the positive response message of data request service according to the identifier, as shown in the table 2.

surface 2 Affirmative response