F3 key create Ò in VT100 terminal emulation on MC9090G

We use the Wavelink TE to connect to a barcodesystem . The emulation serverlanguage is set to UTF8 to show some german characters correctly.

Now the developer of the barcodesystem created a menupoint where we have to send a F3 to get a list back. When hit the F3 key on the scanner I get a Ò character.

So the question is how to send the F3 ?

In a terminal from a PC / Mac it's working

Thanks for your help

Ronald