15-16
IM DLM3054-01EN
Error Type (Error Type Or)
If you set the search mode to Error, select the error types to search for from the following settings.
Parity
The instrument calculates the parity of the protected identifier field. If the result does not
satisfy the following equations, the instrument triggers on the protected identifier field’s stop
bit position.
Even Parity Check:
ID0 xor ID1 xor ID2 xor ID4 xor P0 = 0
P0 = ID0 xor ID1 xor ID2 xor ID4
ODD Parity Check:
ID1 xor ID3 xor ID4 xor ID5 xor P1 = 1
P1 = ¬(ID1 xor ID3 xor ID4 xor ID5)
CheckSum Revision LIN 1.3 (classic checksum):
If the calculated result of all data fields and the checksum is not 0xFF, the instrument
triggers on the checksum field’s stop bit position.
Revision LIN 2.0 (enhanced checksum):
If the total value
1
of the protected identifier field, all data fields, and the checksum is not
0xFF, the instrument triggers on the checksum field’s stop bit position. However, if the
protected identifier field ID is from 60 (0x3c) to 63 (0x3f), the instrument triggers based on
the calculated result of the classic checksum.
Sync
If the synch field is not 0x55, the instrument triggers on the synch field’s stop bit position.
Timeout
The instrument triggers if any of the following three errors occurs.
Slave Not Responding Error:
After a break detection, if the frame is not finished before the time determined by the
following equation elapses, the instrument triggers.
1.4×(T
Header2
+ T
Response3
)
Header Timeout Error:
After a break detection, if the header is not finished before the time determined by the
following equation elapses, the instrument triggers.
1.4×T
Header2
Response Timeout Error:
After a break detection, if the response is not finished before the time determined by the
following equation elapses, the instrument triggers.
1.4×T
Response3
Framing
When a low-level stop bit is detected in the field, data, or checksum, the instrument triggers.
The instrument may trigger if it detects a break and synch field in the middle of a frame.
1 If the value exceeds 255, it is carried over.
2 Nominal header length T
Header
= 34 × Tbit
4
3 Nominal response length T
Response
= 10×(N + 1)× Tbit
4
(N: data length)
4 Nominal time needed to transmit one bit defined in the physical layer.
Executing a Search (Search)
The instrument searches for locations where the specified search conditions are met. Then, the instrument
displays the frame corresponding to the specified detected point number (Pattern No) expanded in the zoom
window.
Detected Points
The detected points are the same as the trigger points.
Jumping to the Specified Field (Field Jump)
The instrument searches for locations where the specified search conditions are met. Then, the instrument
displays the frame corresponding to the specified detected point number (Pattern No.) expanded in the zoom
window.
Break, Synch, ID, Data, CheckSum
15 Analyzing and Searching Serial Bus Signals