GeoVision GV-AS2120 IP Control Panel - Manual (Page 222)

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[GeoFinger Function]
For
GV-GF1901 / GF1902 / GF1911 / GF1912
, select the checkbox
and type the
XID Number
located on the back of the reader.
Click
Submit
to detect the readers. If any GV-Reader / GV-GF Fingerprint Reader is
detected, a green mark will appear in the
Status
field; if not, a red mark will appear.