Help with braille display (Varioconnect 12)

Hi all, I have just received from a friend of mine a braille display. It is the varioconnect 12 cells, and I can't pair it with my iPhone. I went to general / accessibility / voiceover / braille, turned the varioconnect on, and when I had to enter with the pimcode... no idea which is the pimcode. I tryed to find the manual of this brailledisplay, but at the baum website I found anything. Can someone point me directions to find the manual or teach me how to pair ir correctly? Thank you.