Where:
M
2
= A negative response message shall only be sent if the request message was invalid for the above
reasons and the request was physically addressed.
8.15.5 Message Flow Example TesterPresent.
8.15.5.1 TesterPresent.
The tester sends a TesterPresent request message to a physical node, which
requires a response message from the addressed node. See Table 156.
Network parameter:
Node physicalRequestCANId = $242.
Node USDTResponseCANId = $642.
Table 156: Physically Requested TesterPresent (response required)
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)
$242
01
$3E
---
---
---
---
---
---
N(USDT-SF)
$642
$01
$7E
---
---
---
---
---
---
The tester sends a TesterPresent request message to a functional system. See Table 157.
Network parameter:
Functional System Address (FSA): $FE = All nodes.
The nodes shall not send a positive response message.
Table 157: Functionally Addressed TesterPresent (no response allowed)
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
$01
$3E
---
---
---
---
---
no positive response messages
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