RSSI Reading

Are there any way to get RSSI value from the incoming packet. For XBee Series 1, we have getRssi() function in XBee-Arduino or XBee api library. But I’m now trying with Series 2 and I would like to avoid sending DB command to measure RSSI.
I have written a function in XBee arduino library

uint8_t ZBRxResponse::getRSSI(){
return (getFrameData() [6]);

But, whenever I read the value, it shows 248. I appreciate all your helps.