GeoVision GV-AS2120 IP Control Panel - Manual (Page 28)

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1.2.1.B RS485 Readers
For long-distance connection and non-Wiegand card readers, you can establish RS-485
connection with any GV-Readers and GV-GF1911 / 1912. GV-AS100 can connect with
1
reader
through RS-485 connection. GV-AS1010 can connect with up to
2 readers
through a
single RS-485 cable.
When connecting a second reader to GV-AS1010, you will need to set up a separate power
source to power the second reader.
6 RS485 B-
5 RS485 B+
GV-AS100
RS485-
RS485+
GV-Readers or
GV-GF Fingerprint Readers
11 RS485 -
12 RS485 +
GV-AS1010
RS485-
RS485+
Up to 2 GV-Readers and
GV-GF Fingerprint Readers
Figure 1-7