GeoVision GV-AS2120 IP Control Panel - Manual (Page 114)

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Note:
1. Each set of 12V power output and GND can provide power for up to 2 readers. The 3
sets on the power terminal can support up to 6 readers. If you wish to connect more
readers and the Wiegand interfaces are already occupied, you can connect the
readers to external power source.
2. By default, a jumper cap is installed on the RS485_A Terminal Resister (J37) to
ensure stability when the RS-485 connection between GV-AS410 / 4110 / 810 / 8110
and the reader is over a long distance.
3. Although up to 8 RS-485 readers can be connected, GV-AS410 / 4110 only supports
control of up to 4 doors.