Geovision GV-AS110 User Manual Page 96

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4.2.1.B RS-485 Readers
For long-distance connection and non-Wiegand card readers, you can establish RS-485
connection with any GV-Readers and GV-GF Fingerprint Readers. Up to 8 readers can be
connected together with a single RS-485 cable to the RS-485 interface on GV-AS210 / 2110.
When multiple readers are connected together, an extra power supply to each unit is
required. Use 12V power output and GND on the power terminal or the Wiegand connectors
to power on each unit.
Figure 4-3
Note:
1. Each set of 12V power output and GND can provide power for up to 2 readers. The 2
sets on the power terminal can support up to 4 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. When the RS-485 connection between GV-AS210 / 2110 and the reader is over 600
meters, turn ON the RS485 A Terminal switch to avoid unstable signals.
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