Installation Guide for C3-X60 Series Control Panel
TCP/IP Communication System Networking
4.3 RS485 Network Communication
1.
RS485 communication wires are made of internationally accepted RVSP wires
(shielded twisted pairs), which prove effective to prevent and shield
interference. RS485 communication wires should be connected by means of
bus cascade instead of in a star form, to achieve a better shielding effect by
reducing signal reflection during communications.
2.
A single 485 bus can be connected with 63 access control operator panels at
most, but preferably should be connected with less than 32.
3.
To eliminate signal attenuation in communication cables and suppress
interference, if the bus is longer than 300 meters, one 120ohm resistance is
usually inserted between the first and last access control operator panels on the
RS485 bus.
4.
When EXT485 terminals connected with inBIO reader, it is recommended that
the wire should be less than 100 meters.
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