eSSL inBIO460 Series, User Manual

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4. System Networking
4.2 TCP/IP Network Communication
The Ethernet 10/100Base-T Crossover Cable, a type of crossover network cable, is
mainly used for cascade hubs and switches, or used to connect two Ethernet
end-points directly (without a hub). Both 10Base-T and 100Base-T are supported.
TCP/IP Communication System Networking
4.3 RS485 Network Communication
1. RS485 communication wires are made of internationally accepted RVVP
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.
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