Change Detect Error

I’ve just recently received my xbee series 2 and I am running some initial tests. My setup is that I have one xbee connected to my PC via serial port in API mode and it’s running firmware version 1320.

I’ve been able to send commands and receive responses for things like at%v, atvr, atd0 without any problems. I am now trying to test atic; I’ve set DIO0 to Digital Input (Tx & Rx are from the PCs perspective): -

Tx=7E 00 04 08 01 64 30 62
Rx=7E 00 06 88 01 64 30 00 03 DF

But when I send an atic command I get an invalid command response: -

Tx=7E 00 04 08 01 69 63 2A
Rx=7E 00 05 88 01 69 63 02 A8

I assume I’m missing something, any assistance would be appreciated.