Страница 1 мировой engineering стандарты общая спецификация

Page 92
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
Variable/Meaning
Values
Record_match_found
This is a flag used in the pseudo code to keep track of whether a record exists
which matches the one requested.
YES/NO
DTC_Number
This is a local variable that is set equal to the DTC Number from the request
message.
Matches the value from the
request message
8.3.6.2 Node Interface Pseudo Code.
Powerup States:
None
Each time a $12 message is received, the following logic is executed:

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February 2010
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BEGINFUNCTION Serv_12_Msg_Recvd()
SELECT FIRST
WHEN ($level=$01) /* readFailureRecordIdentifiers request message */
IF (message_data_length != 2)
send Negative Response ($7F $12 $12) /* Invalid Format. */
ELSE IF (Device cannot provide Failure Records at this time) THEN
Reject the request with a ($7F $12 $22) for conditions not correct
ELSE IF (Processing this message will take more than P2
C 
ms) THEN
Send ($7F $12 $78) /*for RequestCorrectlyReceived-ResponsePending */
…..
Send ($52 $01 ….) /* positive response message */
ENDIF
WHEN ($level=$02) /* readFailureRecordParameters request message */
IF (message_data_length != 6)
send Negative Response ($7F $12 $12) /* Invalid Format. */
ELSE IF (Device cannot provide Failure Records at this time) THEN
Reject the request with a ($7F $12 $22) for conditions not correct
ELSE
record_match_found ←
NO
DTC_Number ←
((failureRecordIdentifier[DTCHighByte] << 8) |failureRecordIdentifier[DTCLowByte])
FOR (record_index ←
0 TO (num_records - 1) BY 1)
/* the DTC comparison below shall check for a match of both the MSB and the LSB */
IF ( (record_array[record_index].record_number_stored =
failureRecordIdentifier[failureRecordNumber]) AND
(record_array[record_index].DTC_Number = DTC_Number) AND
(record_array[record_index].DTC_FailureType =
failureRecordIdentifier[DTCFailureTypeByte]) )
record_match_found ←
YES
ENDIF
ENDFOR
IF (record_match_found = NO)
send Negative Response ($7F $12 $31) /* Request Out Of Range. */
ELSE IF (Processing this message will take more than P2
C 
ms) THEN