How do I set up an SNMP trap?
Modbus register data is placed in local registers using Read Maps and Write Maps. Each local register is accessible by standard SNMP Get and Set requests. Threshold "rules" determine when traps are sent. The image below is an actual screen shot of a threshold rule that will result in a trap when the Modbus data mapped to local register 7 exceeds a level of 1000. Data values are scaled to any units you decide. You find the threshold rules in the System->Action Rules->Thresholds page.
Additional configuration pages allow setting the IP address or Host Name of one or more SNMP managers that v2c traps are to be sent to. Traps may be repeated periodically for as long as the rule tests true. Trap data includes the register name and number, data value that caused the trap, the event name, test type, and test threshold.
Once you have the Threshold Rule set up, you need to go to the IP Network->SNMP Setup->Trap Enable page and check off whether to trap on true, false, or both, and also which group(s) to send the trap to. The following is what you would see for the above rule:
The other tabs under IP Network->SNMP allow you to set up the SNMP manager IP addresses or host names for each of up to 3 groups.
