I just want to enable snmp on Emerson UPS,so any can guide me how to configure snmp on same with snmp card?
They should be configured by default out of the box. (The Liebert/Emerson UPS's we use do.) You just need to connect to the SNMP card with a serial cable or connect to the web interface and adjust the settings.
You may want to consult the product's (emerson UPS) documentation. I bet it has a GUI or Web based administration where you can set the SNMP settings of the device