You can also try something else. I got a Video Terminal before my Beolink 1000 for use with my L2800.
The seller demonstrated the Beovision with a Beolink 1000 but gave me the V -Terminal to use.
It needed batteries but it did not work either. I took it apart and tried to touch the printboard. That worked. Put it back together and it worked with no problem. Got a new rubberpad as it had several numbers ripped from use.
Be carefull when open the remote as there is 2 wires going to the batteries. If they get loose you need to solder them back on.