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HMIs, human machine interfaces ► Panel PC ET/MT-4x6... ► Electrical Installation ► Connection informations ► RS 232 information
The signal names of the refer to the transfer signal for a to 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.
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The RS232 interface of the devices is provided at terminals 9-13 at the X2 and X3 terminal blocks. The interface is a type interface. The signals have the following meaning:
Pin
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Name
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Definition
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9
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TxD
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Data/Out - the data is sent from here.
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10
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RxD
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Data/In, this is where the data is received.
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11
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RTS
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Request to send, transmission request from DTE to , Signals to the DCE that the DTE wishes to send data
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12
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CTS
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Clear to send, DCE ready to receive. ready to receive. Signals that the DCE can receive data from the DTE.
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13
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GND
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Ground, equipotential bonding
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DTE to DTE connection:
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Female
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Pin
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9 | 25
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6
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6
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4
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20
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3
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2
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2
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3
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8
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5
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7
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4
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5
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7
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Case
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Shield
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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.
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DTE to DCE connection:
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Male
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Pin
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9 | 25
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4
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20
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1
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8
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3
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2
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2
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3
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7
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4
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8
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5
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5
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7
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Case
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Shield
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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.
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cable type:
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shielded data cable at least 5 x 0.14mm²
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