It's a simple 20 contact female connector (HE10-HE14 like). . 
Possible references: 
    Harwin M20-7831046 - Farnell :  799-2025
    Etec : 549-4949
    Kontec : 230-4916
Check the height in the datasheet before ordering. The plastic header should be 8mm (or 8.5) height.