HELP!! XBee Series 1 GPIO Star-Network Setup!

For what I want to accomplish I believe a Star-Network topology is sufficient. From my readings, I should be able to accomplish such topology via XBee S1. At the moment, the coordinator is receiving API packets every 20ms, however, no matter how I press the buttons connected to End Device 1, the incoming API packets stay the same. So I am not sure where the problem is. Are my configuration settings off? Did I miss something?

I am using Series 1 XBees, modem type XB24, function set: XBEE 802.15.4 and version 10EC.

Please advise. Any help is much appreciated!