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Example: Undervoltage Error (0x7f260, Count = 3)
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Two or more previously active diagnostic trouble codes:
If two or more error are stored in the error memory, the data transmission occurs in the same
way as a DM1 transmission with two or more errors over the data transfer protocol:
The transmission must be requested over a request message with PGN of DM2 in the payload.
Then the keypad send a ready to send answer with the byte count and the message count of
the transmission. Before the keypad starts transmitting DM2 it expects a clear to send
message. After the data transfer the keypad expects an end of message acknowledgment.
Without an acknowledgment the keypad sends a connection abort message, shown in the
following table:
The first data byte of TP.Conn_Abort identify the connection abort. The data byte 1 describe
the reason of the connection abort and is specified in the document SAE J1939-21. In case
that the TP.CM_EndOfMsgACK are not received by the keypad, the reason code is 0x03 (a
timeout occurred and this is the connection abort to close the session).
CAN-ID
DLC Data
Byte 0
Data
Byte 1
Data
Byte 2
Data
Byte 3
Data
Byte 4
Data
Byte 5
Data
Byte 6
Data
Byte 7
0x18EA80FF
(Request)
3
0xCB
0xFE
0x00
---
---
---
---
---
0x18FECB80
(DM2)
8
0x00
0x00
0x60
0xF2
0xE4
0x03
0xFF
0xFF
CAN-ID
DLC Data
Byte 0
Data
Byte 1
Data
Byte 2
Data
Byte 3
Data
Byte 4
Data
Byte 5
Data
Byte 6
Data
Byte 7
0x18EA80FF
(Request)
3
0xCB
0xFE
0x00
---
---
---
---
---
0x1CECFF80
(TP.CM_RTS)
8
0x10
Byte
Count
LSB
Byte
Count
MSB
Message
Count
0xFF
0xCB
0xFE
0x00
0x1CEC80FF
(TP.CM_CTS)
8
0x11
Packet
Count
Next
Package
0xFF
0xFF
0xCB
0xFE
0x00
0x1CEBFF80
(TP.DT)
8
Message
number
Message
Data 0
Message
Data 1
Message
Data 2
Message
Data 3
Message
Data 4
Message
Data 5
Message
Data 6
0x1CEBFF80
(TP.DT)
8
Message
number
Message
Data 7
Message
Data 8
Message
Data 9
Message
Data 10
Message
Data 11
Message
Data 12
Message
Data 13
0x1CEC80FF
(TP.CM_End
OfMsgACK)
8
0x13
Byte
Count
LSB
Byte
Count
MSB
Message
Count
0xFF
0xCB
0xFE
0x00
CAN-ID
DLC Data
Byte 0
Data
Byte 1
Data
Byte 2
Data
Byte 3
Data
Byte 4
Data
Byte 5
Data
Byte 6
Data
Byte 7
0x1CECFF8
0 (TP.Conn_
Abort)
3
0xFF
0x03
0xFF
0xFF
0xFF
0xCB
0xFE
0x00