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


GM WORLDWIDE ENGINEERING STANDARDS



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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 65 of 336 
6.3 Network Layer Parameter Definitions. 
6.3.1 Network Layer Timing Parameter Definitions. 
Table 35 specifies the network layer timing parameters 
to be used by the tester and the GMLAN ECU(s) for enhanced diagnostic communication based on the 
definitions in OSEK/COM and ISO 15765-2 Network layer services. Transport layer error handling shall be per 
ISO 15765-2. The network layer timing parameters specified in Table
 
35 are also applicable during an active 
programming event. 
Table 35: Network Layer Time-Out and Performance Requirement Values 
Parameter 
Description 
Timeout Value N 
Note 1
 
Performance 
Requirement Value 
N_As/ N_Ar 
Time from transmit request until a CAN 
frame transmit confirmation is received. 
250 ms 

N_Bs 
Time that the transmitter of a multi-frame 
message shall wait to receive a flow control 
(FC) frame before timing out with a network 
layer error. 
250 ms 

N_Br 
Maximum time for the receiver of a multi-
frame message to transmit a flow control 
frame after receiving the first frame (FF).

< 100 ms 
N_Cs 
Maximum time from either receiving a flow 
control continue to send (FC.ConTS) frame 
or transmitting a consecutive frame (CF) 
until transmitting the next CF. 

< 100 ms 
N_Cr 
Time that the receiver of a multi-frame (MF) 
message shall wait to receive a consecutive 
frame (CF) after sending a flow control (FC) 
frame or receiving the previous consecutive 
frame (CF) before timing out with a network 
layer error. 
250 ms 

Note 1:
OBD/EOBD devices whose network layer only supports a single set of timing parameters shall support the timing values specified 
ISO15765-4 (which references ISO15765-2) for both OBD and enhanced diagnostic communication. Non-OBD/EOBD devices, and 
OBD/EOBD devices which can support different timing values for OBD vs. enhanced diagnostics, shall support the values in this table for 
enhanced diagnostic communication.

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