This is all a little greek to me but I found this that I thought might help me? I don’t understand some of the terms so I was wondering if they made sense to you? (t mentions HDMI but then don’t see the option in the list. Sorry to bother…
Discrete Remote Codes for zapping to extensions
The TV shall support discrete RC5 commands to directly zap to any extension (including Front/Side, HDMI,…).
Rationale: Users (& special dealers) have to be able to make special applications with our TVs and they want to be able to select directly certain functions, like direct selection of externals, screen formats etc. (so direct RC codes).
RC5 3,05 and 3,58 Side/Front
RC5 3,04: Ext1
RC5 0,57: Ext2
RC5 3,56: Ext3
RC5 3,57: Ext4
RC5 3,123: Ext5
RC5 3,06: Ext6
RC5 3,07: Ext7
RC5 3,08: Ext8
Remark: The extension numbers above refer to all inputs of all regions - the exact connector depends on connectivity configuration