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

Parameter 
Name 
Value 
Description 
WFT
max
WaitFrame 
Transmission 
0 
Note 1
No FlowControl wait frames are allowed. The FlowControl frame sent 
by the tester following the FirstFrame of an ECU response message 
shall contain the FlowStatus FS set to 0 (ContinueToSend), which 
forces the ECU to start immediately after the reception of the 
FlowControl frame with the transmission of the ConsecutiveFrame(s). 
BS 
BlockSize 
0 
The FlowControl 
BS
parameter value of the first FlowControl frame 
following the FirstFrame of an ECU response message shall be 
zero
, 
which means that all following ConsecutiveFrames of the response 
message are sent in one block by the ECU without any subsequent 
FlowControl frame sent by the tester. 
ST
min
SeparationTime 
0 
The FlowControl 
ST
min
parameter value of the FlowControl frame 
shall be 
zero
(minimum time between consecutive frames). The 
tester shall be able to receive back-to-back ConsecutiveFrames sent 
by one or multiple ECU(s) in response to a physically or functionally 
addressed request message. 
Note 1:
The WFT
max
value defines the maximum number of WaitFrames allowed to be transmitted in a row by the receiver of a 
FirstFrame. 
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
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February 2010 
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Tester
ECU
FlowControl
 
frame with
FS=0, BS = 0, STmin = 0
FirstFrame