Hörmann 638466 Connection unit light grid HLG for the controls A/B 445, A/B 460, B 460 FU (ITO 400), 360 

NOTE:
Only in conjunction with HLG.
The 6-core system cables for the control and monitoring system
  for the connection between the frame boxes are
  to be ordered separately.
This connector unit can be used for retrofitting
  of an HLG (connection to X20,
  Controls A/B 445, A/B 460 and B 460 FU
  only from index C, year of construction 05/2005).