Siemens SIMATIC S5 Series, Manual

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Description of the System S5-95U, Second Serial Interface
The second serial interface is non-floating. The cables are connected to a 15-pin sub D socket.
Assignment of the 15-pin sub D socket:
Figure 1-3 Pin Assignments of the Second Serial Interface of the S5-95U
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8
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M
*
(Reference potential)
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OUT-
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OUT+
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TTY
IN-
(TTY receive line -)
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M
*
(Reference potential)
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20 mA (TTY current source)
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TTY
IN+
(TTY receive line +)
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* M
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M internal (still available at interface SI1)
1-8
EWA 4NEB 812 6095-02