query the upper and lower MAC address on XBee 900HP using SL and SH

I need to request the lower and upper 64 bit MAC address that is on the under side label of the XBEE900HP. I am in API mode, not AT. Here is my attempt but I get back an echo of the original message. Maybe I should be using a different ‘at command’

the entire message is 7e00050801534c:

the breakdown is:
7e - frame delimter
00 - len hi
05 - len lo
08 - at command (or should I use transmit request 0x10)?
01 - please ack
53 - S
4c - L
57 - checksum