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Mountingandwiring

3.11 RS422/RS485connections(CX9020N031)

TheCX9020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5: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6: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

CX9020 29Version1.1

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Beckhoff CX9020 Manual do Utilizador Página 29