Siemens SIMATIC S5-90U System Manual page 36

Technical Description
S5-90U: Pin Assignments of the Programmer Interface
The programmer interface is non-floating. The signal lines are connected to a 15-pin sub D socket.
M (reference potential)
+5.2 V (supply for external loads)
20 mA (TTY current source)
M (reference potential)
20 mA (TTY current source)
M (reference potential)
TTY (TTY incoming line +)
IN+
Figure 2-2. Pin Assignments of the Programmer Interface of the S5-90U
2-2
8 M (reference potential)
15
TTY
7 OUT-
14
TTY
6
OUT+
13
M (reference potential)
5
12
Unassigned
4
11
+5.2 V (supply for external loads)
3
10
TTY
IN-
2
9
Unassigned
1
S5-90U/S5-95U
(TTY outgoing line -)
(TTY outgoing line +)
(TTY incoming line -)
EWA 4NEB 812 6115-02b