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IM DL350-01EN
Setting Error Channels (Error Channel Setup)
For each of the following error types, set whether to detect them as errors, whether to display triggers, and
whether to count them as errors.
Error Type
Error Detection
(Detect)
Trigger Display
(Error Trigger)
Error Count
(Error Count)
Fast Channel CRC
Always ON
ON/OFF
ON/OFF
Slow Channel CRC
Always ON
ON/OFF
ON/OFF
Nibble Value
Always ON
ON/OFF
ON/OFF
Successive Calibration
Pulses (Option2)
ON/OFF
ON/OFF
ON/OFF
Pulse Number
Always ON
ON/OFF
ON/OFF
ON: enable, OFF: disable
Error Detection (Detect)
• Fast Channel CRC
An error is detected when the CRC Nibble value of the Fast CH message is different from the value calculated
using the specified CRC type (explained earlier). If an error is detected, the data in the Fast CH message is
not used to update the Fast CH data. Nor is the Slow CH data that includes a Fast CH message updated.
• Slow Channel CRC
An error is detected when the CRC value of the Slow CH data obtained from the Fast CH message S&C
Nibble value is not correct. If an error is detected, the Slow CH data is not updated.
• Nibble Value
An error is detected when the nibble length of S&C, data, or CRC is outside the 12 to 27 tick range after
a SYNC/CAL pulse of the Fast CH message is detected. If an error is detected, the data in the Fast CH
message is not used to update the Fast CH data. Nor is the Slow CH data that includes a Fast CH message
updated.
• Successive Calibration Pulses (Option2)
*
An error is detected, when as a result of comparing the SYNC/CAL pulse of the current Fast CH message to
the last preceding valid SYNC/CAL pulse, their difference is 1/64 tick or greater. If an error is detected, the
data in the Fast CH message is not used to update the Fast CH data.
However, if three consecutive errors are detected, the third SYNC/CAL pulse is considered as valid, and the
third Fast CH message data is used to update the Fast CH data.
* The instrument uses the “Option 2” detection method as defined in SAE J2716.
• Pulse Number
An error is detected when the number of SYNC/CAL pulses of the current Fast CH message and the number
of the next SYNC/CAL pulses are different from the specified value (the number of data nibbles explained
earlier, Pause Pulse ON/OFF). If no other errors are detected, the data in the Fast CH message is used to
update the Fast CH data. The Slow CH data that includes a Fast CH message is also updated.
If a SYNC/CAL pulse is not detected within the timeout period explained later, all Fast CH and Slow CH data
are set to zero. This is not detected as an error.
4 Vertical Axis