GeoVision GV-AS2120 IP Control Panel - Manual (Page 16)

xiv
Installation Considerations
1. There are distance limitations for Wiegand and RS-485 communications. Please note:
•
Wiegand interface:
Recommended Wiegand cable:
Wiegand cable (a twisted pair of 24 AWG wires)
 100 meters (328.1 feet) for GV-AS2110 / 2120 / 4110 / 8110
 30 meters (98.43 feet) for other GV-AS Controllers
•
RS-485 interface:
600 meters (1968.50 feet)
Recommended RS-485 cable:
standard 485 cable (a twisted pair of 24 AWG wires)
2. GV-ASManager software is used to manage GV-AS / GV-EV Controllers. There is a limit
for the number of controllers connected to GV-ASManager based on communication modes.
•
Through network connection
, up to 1000 GV-AS / GV-EV Controllers can connect to
GV-ASManager.
•
Through RS-485 connection
, up to 16 GV-AS100 / 110 / 120 Controllers can connect
to the same COM port on a computer running GV-ASManager.
3. When presenting cards to GeoVision readers and the built-in readers of GV-AS100 / 1010
/ 110 / 1110 / 120, make sure only one card is presented at a time to avoid frequency
interference.
Note:
1. For RS-485 connection between GV-AS Controllers and readers, user additional
power for the readers when the distance ranges from 30.48 ~ 600 meters (100 ~
1968.50 ft). There is no need to use additional power when the distance is within
30.48 meters (100 ft).
2. For GV-AS100 / 2110 / 2120 / 4110 / 8110, it is highly recommended to replace the
button cell battery included on the circuit board annually.