Found 2 entries in the GSD database.

Manufacturer
Product
Ident Number
GSD Revision
HW Revision
Last Update
GSD File
Bitmap_Device
Bitmap_Diag
Bitmap_SF
HEIDENHAIN
Encoder-Gateway
0xA400
N/A
REV 1.3
N/A
h_4_a400.gsd
HEIDENHAIN
JH Encoder
0xA401
1
REV 1.0
2000
jhdpa401.gsd