Appendix D -
Instrument Log Messages
The log messages of an RM-4 contain information on the normal ongoing operation of the
instrument, as well as different levels of detected operation problems which may affect data quality
or timing.
The messages generated by the instruments are categorized by their severity:
Information (I)
Document the normal operation of the RM-4. Operators do not need to take
any corrective action.
Warning (W)
Minor incidents which may potentially affect data quality or timing.
Operators should keep monitoring the system and check the log files
generated by other system components for related messages.
Error (E)
Incidents which may result in significant loss of data. Operators should take
immediate actions to correct the problem.
Fatal (F)
Serious malfunctions of the RM-4. Operators should immediately
troubleshoot the system and correct the problem.
Debug (D)
Messages tracing the behavior of certain components of the RM-4. The
current verbosity of the RM-4 messaging is set at the Information level, and
therefore, the debug messages are not logged. Contact the Nanometrics
Technical Support if any debug message is found in the log.
During its operation, an RM-4 stores the log messages in its internal ringbuffer memory while
sending them to the central acquisition computer as part of its state-of-health data. An operator
can use the RM-4 user interface to view the last 100 lines of the log messages. These messages are
eventually stored at the central acquisition computer along with the NAQS log messages in the
NAQS log file.
Packet Format
Below is the standard format for a log message packet:
119 bytes
Error message
1 byte
Spare
1 byte
Error Severity ( D, I, W, E , F) which means:
debug, information, warning, error, fatal
2 bytes
Error Number
4
Sequence Number
2 bytes
Instrument ID [5 bit model type, 11 bit serial number]
2 bytes
Spare
4 bytes
Long seconds
1 byte
Packet type = 5 ( bit 5 = 1 is for retransmit)
Size
Component
Table 14: Log Message Packet Format
An error message generated by an RM-4 has the following format:
ProcessName.............(X) Log message
defining that the “Log message” is the message number “X” of the process specified by the
“ProcessName”. The value of the message number varies from 1 to 9. Note that the process name is
padded with dots so that the message number of different messages are always aligned.
These log messages are displayed by NAQS using the following format:
SEV YYYY-MM-DD HH:MM:SS RM4NNN ProcessName.............(1) Log message
RM-4 Manual 43
Appendix D - Instrument Log Messages
Summary of Contents for RM-4
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