RS 232 Informations

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HMIs, human machine interfacesThin Client, ET/MT-5x7-...Connection ofConnection informationsRS 232 Informations

 

The signal names of the RS-232 refer to the transfer signal for a DCE to DTE connection. This requires, that the TxD connection at the modem (DCE) sends the data and the connection at the operator terminal (DTE) receives it, for example. For a connection between an operator terminal and a modem, the terminals correspond exactly to one another.

 

The RS232 interface of the devices is provided at the X97 terminal blocks. The interface is a type DTE interface. The signals have the following meaning:

 

Pin

Name

Definition

1

TxD

Data/Out - the data is sent from here.

2

RxD

Data/In, this is where the data is received.

3

RTS

Request to Send, transmission request from DTE to DCE, Signals to the DCE that the DTE wishes to send data

4

CTS

Clear to send, DCE ready to receive. Signals that the DCE can receive data from the DTE.

5

GND

Ground, equipotential bonding

 

DTE to DTE connection:

 




Female

Pin


9 | 25

xT-xx6

 

9

10

11

12

13

PE

xT-xx7

 

1

2

3

4

5

PE

Cbl_PinningRS232_To_DtE_multiLang

6

6

4

20

3

2

2

3

8

5

7

4

5

7

Case



Shield


 

Consequently, the signals must be crossed for a DTE to DTE connection. If the connected device expects the CTS and/or DTR control signals to be addressed, these must be crossed or bridged accordingly.

 

DTE to DCE connection:

 




Male

Pin


9 | 25

xT-xx6

 

9

10

11

12

13

PE

xT-xx7

 

1

2

3

4

5

PE

Cbl_PinningRS232_To_DCE_multiLang

4

20

1

8

3

2

2

3

7

4

8

5

5

7

Case



Shield


 

In the case of a DTE to DCE connection the signals can be connected 1:1. Since the operator terminal does not supply a DTR, this must be derived from the DCD, if required.

 

cable type:

shielded data cable at least 5 x 0.14mm²

 

 

 

 

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