Cannot change packetization timeout RO value

Running an XBee S2 in API mode. When I send the RO command I get a response but not what I expected. Unless I’m reading it wrong, the RO value won’t change from 02.

Here’s what I’m sending:
7E 00 05 08 01 52 4F 00 55

Here’s the response:
7E 00 05 88 01 52 4F 02 D3

I even tried the WR command afterward, still same result of 02 returned. Am I missing something?