Страница 1 мировой engineering стандарты общая спецификация

#2
#3
#4
#5
#6
#7
#8
T(USDT-SF)
$101
$FE
03
$22
$00
$0C
---
---
---
N1(USDT-SF)
$7E8
$05
$62
$00
$0C
$0B
$B8
---
---
N2(No Resp)
8.6.5.4 Functionally Request PID Resulting In Multi-Frame Response. 
In the example below (Table 88),
the following is assumed true:
•
The vehicle bus has multiple ECUs but only one ECU supports the requested PID.
•
The PID requested is $FF0D (this is only an example).
•
PID $FF0D is defined to be seven bytes in length.
•
The point to point request CAN Id for the responding ECU is $7E0.
•
The USDT response CAN Id of the responding ECU is $7E8.
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GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
Table 88: Functional ReadDataByParameterIdentifier(Multi-Frame Response)
T = Frame Sent By Tester; N = Frame Sent By Node; shaded region indicates PCI
Frame Type CAN Id
#1
#2
#3
#4
#5
#6
#7
#8
T(USDT-SF)
$101
$FE
03
$22
$FF
$0D
---
---
---
N(USDT-FF)
$7E8
$10
$0A
$62
$FF
$0D
$aa
$bb
$cc
T(USDT-FC)
$7E0
$30
$00
$00
---
---
---
---
---
N(USDT-CF)
$7E8
$21
$dd
$ee
$ff
$gg
---
---
---
8.6.5.5 Functionally Request Two PIDs Resulting In Response from Multiple ECUs. 
In the example below
(Table 89), the following is assumed true:
•
The vehicle bus has two ECUs that support this service and both ECUs support requesting at least two
PIDs in a single request.
•
The point to point request CAN Id for ECU 1 is $7E0 and the USDT response CAN Id is $7E8.
•
The point to point request CAN Id for ECU 2 is $7E2 and the USDT response CAN Id is $7EA.
•
The PID for engine rpm (as defined in SAE J1979/ISO 15031-5) is $0C (so this service requests with
$000C). The data returned is two bytes with a transfer function of rpm = N/4.
•
Engine Speed is assumed to be 750 rpm at the time of the request.
•
The PID for Transmission range select (PRNDL) is PID $194F.
•
This PID has one byte of response data where $00 = illegal range, $01 = Park, $02 = Reverse,
$04 = Neutral, $06 = Drive 6, $08 = Drive 5, $10 = Drive 4, $20 = Drive 3, $40 = Drive 2, and
$80 = Drive 1.
•
The gear select position is assumed to be park for this example.
•
ECU 1 supports PID $000C but not PID $194F.
•
ECU 2 supports PID $194F but not $000C.