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FS-8704-09 SNMP Driver Manual Page 19 of 39
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Appendix A.2.1. COV Map Descriptor Example
In this example each time the value found in Data Array 'DA_AI3' at offset 0 changes by at least 0.2 (COS_Deadband) then a trap will be sent.
// Server Side Map Descriptors
Map_Descriptors
Map_Descriptor_Name, Data_Array_Name, Data_Array_Offset, Function, Node_Name, SNMP_OID, COS_Normal, COS_Deadband
PSU_Voltage_Alarm, DA_AI3, 0, SNMP_TRAP, NM_1, 1.3.6.1.4.1.6347.1.1.0.0, COS_Server_Event, 0.2
Content of Trap Messages:
Each trap has 3 OID's. THE OID of the trap itself and OID of the two bound variables (the payload). Systems that use traps are typically set up to
watch for OID's in the payloads and the Trap’s OID is therefore not relevant. The driver allocates trap OID's as follows:
The 1st trap found in the configuration file is allocated OID=1.3.6.1.4.1.6347.6.6. Subsequent traps are allocated ...6347.6.7 ...6347.6.8 etc.
Each COS trap contains two bound variables. The first bound variable has its OID equal to the OID specified in the configuration file. It contains
an Integer reporting the value of the variable at the time the trap is generated. The second bound variable's OID is determined by adding '.0' to
the OID specified in the configuration file. It contains a string reporting the Map Descriptor name (Thus use the variable/tag name to name the
Map Descriptor) and a short report on the event type.
The following are possible descriptions;
Status: HI ALARM
Status: HI WARNING
Status: LO ALARM
Status: LO WARNING
Status: ALARM
Status: DELTA EVENT
Status: NORMAL
The actual states that can be reported depend on the COS states defined in the MD's
e.g. Where a Map Descriptor has COS_Normal defined then possible states are
STATUS: NORMAL
STATUS: ALARM
e.g. Where a Map Descriptor has COS_Hi_Alm, COS_Lo_Alm defined then possible states are
STATUS: NORMAL
STATUS: LO ALARM
STATUS: HI ALARM