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8.19.2 Request Message Definition.
8.19.2.1 ReadDataByPacketIdentifier Request Message (Table 189).
Table 189: ReadDataByPacketIdentifier Request Message
Data Byte Parameter Name
Cvt Hex Value Mnemonic
#1
ReadDataByPacketIdentifierRequest Service Id
M
AA
SIDRQ
#2
sub-function parameter = [
M
LEV_
stopSending
00
SS
sendOneResponse
01
SOR
scheduleAtSlowRate
02
SASR
scheduleAtMediumRate
03
SAMR
scheduleAtFastRate ]
04
SAFR
#3
request_DPIDs[] = [ DPID#1
M
1
/C
1
xx
DPID1
:
:
:
:
:
#n
DPID#m]
U
xx
DPIDm
Where:
M
1 
= Mandatory If value of sub-function parameter = [ $01, $02, $03, $04 ]
C
1 
= Included if value of sub-function parameter = $00 AND request is to stop periodic transmission of
individual DPID(s) (i.e., DPID(s) included in sub-function parameter=$00 request)
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
Page 214
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
8.19.2.1.1 Sub-Function Parameter $Level (LEV_) Definition. 
The following sub-function parameter values
are defined for service $AA 
ReadDataByPacketIdentifier
. The sub-function parameter shall be used in a $AA
service request to select the level of functionality. The sub-function parameter is always present in a request
message. See Table 190.
Table 190: Definition of Sub-Function Parameter In Request Message
Hex Description
Cvt
00
stopSending
Stops periodic transmission of all or certain scheduled DPIDs.
C
2

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