Страница 1 мировой engineering стандарты общая спецификация

Page 194
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
© Copyright 2010 General Motors All Rights Reserved
February 2010
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8.17.8 Tester implications. 
The tester should only request this service with the ALL NODES request CANId
($101) and the ALL NODES extended address ($FE).
The tester should not enable a programming event if it has received a negative response (from any node) to
the initiate programming request is sent.
After enabling a programming event (sending a requestProgrammingMode_HighSpeed request followed by an
enableProgrammingMode message), the tester must not transmit any messages for 50 ms. The test device
must also initialize its protocol converter hardware to high speed operation within 30 ms from the time that the
enableProgrammingMode request message was successfully transmitted on the data link.
TesterPresent (Mode $3E) messages must be sent to all nodes at least once every P3
C 
ms to keep the
programming mode active, otherwise the nodes shall return to normal operation (same as receiving a
ReturntoNormalMode $20 request or a P3
C 
timeout).
The tester must be capable of returning the bus to normal speed mode by issuing a mode $20
ReturntoNormalMode message. After sending a mode $20 request (when the link is in high speed mode), the
tester should wait 1 s before transmitting any messages to allow devices to reset and to prevent possible bus
error or bus off conditions from occurring.
Page 195
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110

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25.06.2020
WORLDWIDE ENGINEERING STANDARDS General Motors Local Area Network Enhanced Diagnostic Test Mode Specification
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