From another post:
"If you have a second Beo 4
you can configure it to constant link mode* by doing the following (it will always send LINK prior
to other commands except TEXT):
- press STANDBY and LIST at the same time (display shows ADD?)
- press >> until display shows CONFIG?
- press 2 0 0 2 (display shows LINK ON)
- press EXIT
Repeat the above to set LINK OFF if needed
* Beo 4 must have SW 5.0 or higher"