National Instruments CAN 372139B-01 - Manual (Page 253)

Chapter 6 Automotive Diagnostic Command Set API for C
© National Instruments Corporation 6-89 Automotive Diagnostic Command Set User Manual
ndUDSReadMemoryByAddress
Purpose
Executes the UDS ReadMemoryByAddress service. Reads data from the ECU memory.
Format
long ndUDSReadMemoryByAddress(
TD1 *diagRef,
unsigned long address,
unsigned char size,
unsigned char dataOut[],
long *len,
LVBoolean *success);
Input
diagRef
Specifies the diagnostic session handle, obtained from ndOpenDiagnostic and passed
to subsequent diagnostic functions. Normally, it is not necessary to manually manipulate
the elements of this struct.
address
Defines the memory address from which data are read. Only three bytes are sent to the
ECU, so the address must be in the range 0–FFFFFF (hex).
size
Defines the length of the memory block to be read.
Output
dataOut
Returns the ECU memory data.
len
On input, len must contain the dataOut array length. On return, it contains the number
of valid data bytes in the dataOut array.
success
Indicates successful receipt of a positive response message for this diagnostic service.