RS 232 information

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HMIs, human machine interfacesEagle ET/MT-3x6...Connection InformationsRS 232 information

 

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 terminals 9-13 at the X2 and X3 terminal blocks. The interface is a type DTE interface. The signals have the following meaning:

 

Pin

Name

Definition

9

TxD

Data/Out - the data is sent from here.

10

RxD

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

11

RTS

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

12

CTS

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

13

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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