Страница 1 мировой engineering стандарты общая спецификация

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#7
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T(USDT-SF)
$7E0
$07
$22
$00
$05
$00
$0C
$00
$1F
N(USDT-FF)
$7E8
$10
$0C
$62
$00
$05
$84
$00
$0C
T(USDT-FC)
$7E0
$30
$00
$00
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N(USDT-CF)
$7E8
$21
$0B
$B8
$00
$1F
$00
$C8
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8.6.5.3 Functionally Request OBD PID $0C - Engine RPM. 
In the example below (Table 87), the following is
assumed true:
•
The bus has two ECUs on it.
•
Both ECUs support this service.
•
ECU 1 supports PID $0C and ECU 2 does not.
•
The point to point request CAN Id for the ECU 1 is $7E0.
•
The USDT response CAN Id of the ECU 1 is $7E8.
•
The point to point request and response CAN Identifiers for the ECU 2 are not detailed here as ECU 2 will
send no response because the request is functional and the PID is not supported.
•
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 2 bytes with a transfer function of rpm = N/4.
•
Engine Speed is assumed to be 750 rpm at the time of the request.
Table 87: Functional ReadDataByParameterIdentifier(PID=000C hex)

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25.06.2020
WORLDWIDE ENGINEERING STANDARDS General Motors Local Area Network Enhanced Diagnostic Test Mode Specification
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© Copyright 2010 General Motors All Rights Reserved
February 2010
Page 111 of 336
T = Frame Sent By Tester; N = Frame Sent By Node; shaded region indicates PCI
Frame Type CAN Id
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