I think so. Try these hex strings, all 9600,N,1:

Code is split into 6 parts

[HEADER][PARA1][ID][PARA2][PARA3][CHECKSUM]

Checksum is calculated by adding [PARA1],[ID],[PARA2],[PARA3]
and then stripping off the first digit in the total.

ENERGY saver OFF must be sent in order for RS-232 to be recognized.

Off
AA 11 FE 01 00 10

Video
AA 14 FF 01 00 14

RGB
AA 14 FE 01 15 28

Component
AA 14 FE 01 09 1C

S-Video
AA 14 FE 01 04 17

Mute ON
AA 13 FE 01 04 13

Mute OFF
AA 13 FE 01 00 12

RGB 2
AA 14 FE 01 16 29

Power On
AA 11 FE 01 01 11

Component 2
AA 14 FE 01 0A 1D

DVI
AA 14 FF 01 18 2C

Energy Save Off
AA 92 FE 01 00 91