Log Record Integrity Verification - Honeywell ERX350 User Manual

4 Key Features
4.3 Logging

4.3.4 Log Record Integrity Verification

Audit Trail and Event Log records have a CRC value associated with them to allow verification that they
have not been corrupted or modified. CRCs of log records that have been uploaded to a computer using
MasterLinkR515 & MasterLinkSQL can be compared to log record CRCs displayed on the HMI. Since
records cannot be modified in the device, the CRC values shown through the HMI are always correct and
so if the CRC values shown in MasterLinkR515 & MasterLinkSQL do not match, then the log record on the
computer may have been corrupted or otherwise modified.
First view the log records uploaded with MasterLinkR515 & MasterLinkSQL. Audit Trail record CRCs can
be viewed through the Audit Trail CSD Conversion feature in the File menu. That outputs a Comma
Separated Value file that includes the record CRC as transmitted by the device and also as computed by
MasterLinkR515 & MasterLinkSQL of the record as stored in the MasterLinkR515 & MasterLinkSQL
database. Event Log record CRCs can be viewed through the Event Log Report. In the report
configuration, select the option to view the CRC values.
To view records in the HMI, select the corresponding menu item, select the desired log (Audit Trail 1
through 5, or Event Log), enter a Sequence Number for a record (as seen in MasterLinkR515
& MasterLinkSQL). The corresponding record will be shown with the sequence number, the CRC value (in
decimal), and the date and time of the record. (Other record values cannot be displayed via the HMI.
Compare the CRC value on the device display with the one in the Audit Trail CSD file or the Event Log
report. The UP and DOWN arrow keys can be used to show the previous or next record.
Honeywell 65
2023