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Num_PIDs_Requested
This is variable that contains the number of PIDs in the request message. This is
calculated by taking the message length, subtracting 1, and then dividing by 2.
1 to number of PIDs
allowed in a single
request
ReqPIDArray[]
This is an array that contains the PID number from the request message.
N/A
Process_Request
This is a local flag used to keep track of whether or not a positive response is to be
generated based on the request message.
YES/NO
PidStructArray[]
This is an array of structures that contain the data needed to support PIDs. for the
purposes of the pseudo code of this service it is assumed that each structure
contains the following information:
1. PidNumber - The PID number.
2. Rc78Needed - Set to YES if it is necessary to send a $7F $SID 78 response
and NO if no $7F$SID $78 is needed.
3. PidSecure - Set to YES if security access is required to retrieve PID data.
4. PidSecurityCode - Set to YES if security code access is required to retrieve
PID data.
Other elements may exist in the structure such as a pointer to a function to retrieve
the data, memory address and length information (for a dynamic PID, see $2D
service), etc. Only the PidNumber, Rc78Needed, PidSecure, and PidSecurityCode
are shown here for the purposes of the pseudo code.
The pseudo code uses the following convention to access an element of the
structure:
PidStructArray[0].PidNumber would be the PID number of the first PID structure in
the array.
N/A
ReqIndex
This is a local flag used for indexing through the array of PIDs in the request array.
0 to
(Num_PIDs_Requested-
1)
NumArrayElements
This is a local flag set to the number of elements in the PidStructArray.
ECU dependent
Index
0 to

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This is a local flag used to index through the array of PID structures when
determining if the PID requested is valid
(NumArrayElements -1)