General Specification Electrical Function gmw3110 General Motors Local Area Network Enhanced Diagnostic Test Mode Specification


 Node Interface Data Dictionary (Table 123)



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8.10.6.1 Node Interface Data Dictionary (Table 123). 
Table 123: Node Data Dictionary of DynamicallyDefineMessage Service Pseudo Code 
Variable/Meaning 
Values 
message_data_length
Security_Access_Unlocked 
Security_Access_Allowed
Reference Common/Global 
Pseudo Code Data 
Dictionary For Definition Of 
These Flags/Variables 
valid_request 
This is a local flag which is used to keep track of whether or not the request 
message is OK to process.
 
YES/NO 
invalid_PID 
This is a flag used to keep track of whether or not all of the PIDs in the request 
message are supported by the device.
 
YES/NO 
total_length 
This is a counter used to keep track of the number of data bytes contained within 
a DPID. A DPID can contain a maximum of seven data bytes. As each PID in the 
request message is processed, the number of bytes needed to transmit that PID 
in the frame is added to this counter.
 
$01 thru $07 
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GMW3110 
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Variable/Meaning 
Values 
max_PID_index 
This is a constant that is used when indexing through the array of supported PIDs 
to determine if a PID is supported. Its value is equal to 1 less than the number of 
PIDs supported by the ECU. 
constant determined at 
compile time 
PID_Req_Index 
This is a local variable used to index through the array of supported PIDs to 
determine if a PID is supported. 
0 to max_PID_index 
Requested_PID 
This is a local variable which is set equal to a specific PID number from the 
request message when indexing through the list of requested PIDS to determine 
if all requested PIDs are supported. 
$0000 to $FFFF 

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