You need to enable broadcasting in the EZIO2X4. When you do, the unit will send a broadcast message (that the EZSrve will receive) with a CMD1 of 0x27 and a CMD2 reflecting the status of the inputs.
Here is the command set guide that outlines the format of CMD2
In regards to enabling broadcast, you can send an insteon message (see the guide), or in the utility on the bottom right in the EZIO panel, you will see the ability to set the configuration of the EZIO module. First read the existing configuration, then enable broadcast, write, and then SAVE.
Let me know if you need more.