X7 - COM2 RS-422

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HMIs, human machine interfacesPanel PC, ET / MT 4x8...Electrical InstallationConnection ofX7 - COM2 RS-422


X7 with RS-422 version:




In the RS-422 the only thing that is defined are the electric characteristics of the interface (OSI reference model, level 1). No standard exists for the connector pin assignment or the flow control protocol (control of data exchange, level 2), and you have to refer to the assignment information contained in the manuals of the connected devices for the exact wiring. The connected devices furthermore have to support the same protocol.


The RS-422 is mainly intended for a point-to-point connection. In process technology it is also used to realise a bus system (multi-drop) with (n) participants.


Classic point-to-point connection:




Multidrop connection:


Device 1

Device 2

Device (n)


The PIN configuration of the other unit will be detailed in the interface description issued by the unit's manufacturer.


cable type:

Data connection at least UTP [unshielded twisted pair] in rough environment STP [shielded twisted pair]



Port configuration:

Open the "Dialogue Manager".

Select the "E-Box Settings".

Click on the DropDown button DiagManager_DropDownBtn on the right-hand side.

a)Select "RS422" for a connection without EOL resistor.

b)Select "RS422 Rx terminated" for an EOL resistor at RxD.

c)Select "RS422 Rx/Tx terminated" for an EOL resistor at RxD and TxD.





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