Страница 1 мировой engineering стандарты общая спецификация

Table 157: Functionally Addressed TesterPresent (no response allowed)
T = Frame Sent By Tester, N = Frame Sent By Node; shaded region indicates PCI
Frame Type CAN Id
#1
#2
#3
#4
#5
#6
#7
#8
T(USDT-SF)
$101
$FE
$01
$3E
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no positive response messages
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GMW3110
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February 2010
Page 177 of 336
8.15.6 Node Interface Function.
8.15.6.1 Node Interface Data Dictionary (Table 158).
Table 158: Node Interface Data Dictionary of TesterPresent Service Pseudo Code
Variable/Meaning
Values
message_address_type
message_data_length
TesterPresent_Timer_State
diagnostic_responses_enabled
TesterPresent_Timer
Reference Common/Global
Pseudo Code Data Dictionary
For Definition Of These
Flags/Variables
8.15.6.2 Node Interface Pseudo Code.
Powerup States:
None
Each time a TesterPresent ($3E) message is received, the following logic is executed:
BEGINFUNCTION Serv_3E_Msg_Recvd()
IF (message_data_length = 1) THEN
TesterPresent_Timer ←
0 /*Reset the tester present timer*/
/* send a pos. resp. if request was physically addressed and diagnostic responses are enabled*/
IF ((message_address_type = PHYSICAL) AND (diagnostic_responses_enabled = YES)) THEN
send ($7E) response message
ENDIF
ELSE
IF (message_address_type = PHYSICAL) THEN
send Negative Response ($7F $3E $12) InvalidFormat
ENDIF
ENDIF
ENDFUNCTION
The following logic is used to implement the TesterPresent_Timer in the node’s main processing loop:
BEGINFUNCTION Serv_3E_Background_Logic()
IF (TesterPresent_Timer_State = ACTIVE) THEN
increment TesterPresent_Timer by the length of the main processing loop
IF (TesterPresent_Timer ≥ P3
C
) THEN
Call Exit_Diagnostic_Services() /* function in service $20 */
ENDIF
ENDIF
ENDFUNCTION