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Mountingandwiring

3.11 RS422/RS485connections(CX20x0N031)

TheCX20x0N030systeminterfaceprovidesanRS422orRS485interface,COM1(X300).Itis

implementedona9poleSubDsocketstrip.Ifmorethanoneinterfaceisrequiredthesystemcanbe

extendedviatheTerminalBus(KorEbus)orBusTerminals(KL/EL6021)whichprovideserialinterfaces.

Thepinassignmentisshownatthebottomofthepage.

Themaximumbaudrateonbothchannelsis115kbit.Theinterfaceparametersaresetviatheoperating

systemorfromthePLCprogram.

COMinterface(socket)

Table7:PinassignmentoftheCOMinterface

PIN Signal Type Description

2 TxD+ DataOut+ Transmit422

3 RxD+ DataIn+ Receive422

5 GND Ground Ground

6 VCC VCC +5V

7 TxD DataOut Transmit422

8 RxD DataIn Receive422

ForRS485pins2and3(data+)mustbeconnected,andpins7and8(data).

Settingtheinterfaceparameters

Theinterfaceisparameterisedasfollowsinthedeliverycondition

Table8:RS485withoutecho,endpoint(terminated)standardsetting

Function Status

Echoon off

Echooff on

Autosendon on

Alwayssendon off

Autoreceiveon on

Alwaysreceiveon off

Termon on

CX2020,CX2030,CX2040 33Version1.2

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Beckhoff CX2020 Manual do Utilizador Página 33