A Syslog UPD packet contains three fields: PRI, Header, and Message.
PRI Field
The PRI field represents the two Syslog values named Facility and Severity. The Metasys system maps its messages into Syslog Facility and Severity numeric values as described in this section.
All Metasys Audit entries are sent to Syslog setting Facility to 13 (log audit) and Severity 6 (Informational).
All Metasys Events are sent at Severity 4 (Warning).
Metasys Events sent to Syslog reflect the Event Priority in the Facility part of the Syslog packet PRI field to align with the Event Notification Priority as described in Appendix M, Table M-1 of the ANSI/ASHRAE Standard 135-2012 (BACnet®), and map as follows:
| Metasys Event Priority (sent to Syslog with): | Facility set to: |
|---|---|
| 00 - 31 | 16 (Local use 0) |
| 32 - 63 | 17 (Local use 1) |
| 64 - 95 | 18 (Local use 2) |
| 96 - 127 | 19 (Local use 3) |
| 128 - 191 | 20 (Local use 4) |
| 192 - 255 | 21 (Local use 5) |
These BACnet ranges do not align with the Event Priority Tables 80–83 in Metasys SMP Help (LIT-1201793). Metasys message groups conform to an earlier BACnet standard.
Event acknowledgments are sent to Syslog with Facility 1 (User-level messages), and Severity 5 (Notice).
Header Field
The header field sets the Hostname to the configured COMPUTER_NAME attribute of the NAE551S-2 device object.
Message Field
All Metasys system initiated Syslog messages set the Tag (first part) of the Message portion to Metasys. The content of the audit and event follows the tag, and each is described in the preceding section.
Refer to your Syslog server documentation for further information on how it displays information compliant with RFC3164.