Страница 1 мировой engineering стандарты общая спецификация

Page 212
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
© Copyright 2010 General Motors All Rights Reserved
February 2010
Page 212 of 336
8.19.1.2 Requesting Periodic DPID Scheduling - Sub-Function Parameters ($02 sendAtSlowRate, $03
sendAtMediumRate, and $04 sendAtFastRate). 
If the Node supports any of the levels that allow a tester to
schedule periodic DPID transmissions (sub-function parameters $02 through $04), it shall have a Periodic
DPID Scheduler (PDS). The maximum number of simultaneously scheduled DPIDs that the Node is required
to support shall be documented in the ECU Component Technical Specification (CTS). Each DPID in the PDS
shall be capable of being scheduled at one of the allowable periodic rates independent of the rate applied to
the other DPIDs in the PDS. The ECU shall be able to support in a single periodic DPID request, as many
DPIDs as there are items in the PDS. Refer to parameter PDS_Length in pseudo code.
The default periodic rates (scheduling rates) for the periodic DPID scheduler are 
1000 ms 
for slow, 
200 ms 
for
medium, and 
25 ms 
for fast. Periodic rate is defined as the time between any two consecutive messages of
the 
same DPID 
when it is scheduled by this service.
Note: 
This service does not require an ECU to transmit ALL scheduled DPIDs at the same time. It is allowable
to have a minimum time between different DPIDs. The periodic rate is the time between consecutive
transmissions of a single given scheduled DPID, NOT the time between transmission of ALL scheduled DPIDs.
The default rates are guidelines and may be modified based on ECU capabilities. The actual data rates
associated with slow, medium, and fast, shall be documented in the CTS.
Note: 
The actual rate at which a