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

Previous Request
column refers to the last diagnostic 
message sent by the tester and 
New Request
column refers to the diagnostic message that the tester is 
attempting to send next. 
Table 7: Tester Communication Implementation Rules 
New Request 
Addressing Type 
Previous Request 
Addressing Type 
Handling in the Tester 
Physical 
Physical 
Wait until the completion of the previous physical request 
(positive response, or negative response other than $78) 
before transmitting a new physical request. 
Physical 
Functional with 
response 
Wait until the completion of the previous functional 
request that requires a response (positive response, or 
negative response other than $78) before transmitting the 
physical request. 
Physical 
Functional without 
response 
The tester is allowed to transmit the physical request 
immediately (e.g., functional TesterPresent followed by 
any physical request). 
Functional without 
response 
Physical 
The tester is allowed to transmit the functional request 
that does not require a response immediately (e.g., any 
physical request followed by a functional TesterPresent). 
Functional without 
response 
Functional with 
response 
Wait 30 ms after the transmission of the functional 
request that requires a response before transmitting the 
functional request that does not require a response. 
Functional without 
response 
Functional without 
response 
Wait 30 ms after the transmission of the functional 
request that does not require a response before 
transmitting the next functional request that does not 
require a response. 
Functional with 
response 
Physical 
Wait until the completion of the previous physical request 
(positive response, or negative response other than $78) 
before transmitting the functional request that requires a 
response. 
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