I wanted to bump this threat because I saw anther blog post that had some RS232 codes for Samsung that look way different:

[Link: support.justaddpower.com]

For example, Power On..

HEX: AA 11 FE 01 01 11

vs the one in the spreadsheet:

08 22 00 00 00 02 D4

Or do we need to convert the raw string to HEX?