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8.7.6 Node Interface Function.
8.7.6.1 Node Interface Data Dictionary (Table 98).
Table 98: Node Interface Data Dictionary of ReadMemoryByAddress Service Pseudo Code
Variable/Meaning
Values
message_data_length
Security_Access_Unlocked
Reference
Common/Global
Pseudo Code Data Dictionary
For Definition Of These
Flags/Variables
Bad_Address
Status flag that indicates whether any of the range of addresses in the
request is not valid.
TRUE/FALSE
memoryAddress
This is the starting address in ECU memory from the request message.
Varies based on ECU
MemorySize
This is the number or consecutive memory addresses that the tester has
requested (parameter of request message).
$01 to maximum size, where
maximum size is the lesser of
the NWL buffer size or 4094
minus the number of bytes in
the memoryAddress parameter
Memory_Address
This is a local variable used to point to ECU memory when indexing through
the requested addresses to determine if any portion of the requested memory
is invalid, protected, or requires security access. The pseudo code uses
Memory_Address.data to reflect the contents of a given memory address.
Varies based on ECU
memoryDataRecord[]
This is the buffer that stores the contents of the memory addresses from the
request message for transmission in the response.
N/A
Index
This is an index into the buffer for the response data
0 to (messageSize -1)
8.7.6.2 Node Interface Pseudo Code.
Powerup States:
None
Each time a $23 message is received, the following logic is executed:
BEGINFUNCTION Serv_23_Msg_Recvd()
Bad_Address ←
FALSE
IF (message_data_length is invalid) THEN /* 3 + number of address bytes */
send Negative Response ($7F $23 $12) /*Subfunction Not Supported or Invalid Format */
ELSE IF ((memorySize = 0d) OR (memorySize > max value supported by the ECU) OR
(memoryAddress is not a valid address in ECU memory) OR
((memoryAddress + memorySize - 1) is not a valid address in ECU memory)) THEN

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send Negative Response ($7F $23 $31) /*Request Out Of Range */
ELSE
Index ←
$00
IF (the response cannot be sent within P2
C 
ms) THEN
send Negative Response ($7F $23 $78) /*RequestCorrectlyReceived-ResponsePending */