System overview RS485

RS485 is a serial, differential bus physics, which is particularly insensitive to interference and makes long cable lengths/high data rates possible. Unlike the RS232 physics, RS485 can be used to construct a self-contained bus system according to the single master/multi-slave principle by means of the connected slaves receiving commands, executing them and sending the data to the master on demand. The maximum expansion is 1,200 m with max. 32 devices and a maximum data transfer rate of 10 KB. RS485 can be constructed in both the 2-wire and 4-wire system and, like RS422, is operated in push-pull mode.

TwinCAT

Industrial PC/
Embedded PC

Bus Terminals

EtherCAT
Terminals

Fieldbus Box

TwinCAT I/O
– TwinCAT System Manager
– TwinCAT as RS485 master: each serial interface of any Industrial or Embedded PC
Supplement “TwinCAT Virtual Serial COM Driver”: displays serial EtherCAT Terminals as virtual PC interfaces

RS485 master:
IPC with RS485 interface

RS485 interfaces:
Klemmen KL6021,
KL6041

RS485 slave:
Bus Coupler BK8000,
Bus Terminals

RS485 slave:
Bus Terminal Controller
BC/BX8000 (IEC 61131-3),
Bus Terminals

RS485 slave:
Embedded PC with
CX1030-N031/-N041,
Bus Terminals

EtherCAT

RS485 interfaces:
EtherCAT Terminals EL6021, EL6022

RS485 slave:
Embedded PC CX5000,
EtherCAT Terminals

RS485 slave:
Embedded PC with
CX1030-N031, CX1030-N041,
EtherCAT Terminals

IP-Link

RS485 slave:
Compact Box
IPxxxx-B800

RS485 slave:
Coupler Box IL230x-B800 with Extension Box IExxxx