Siemens S5-155U System Manual page 232

CPU
Receiver
Transmitter
Housing, GND
Figure 5-19 TTY Submodule: Connecting Cable CPU - IM 512
System Manual
C79000-B8576-C199-03
Connecting cable: CPU - IM 512
To generate loop current, the IM 512 must be supplied with 24 V at
the subminiature D-type connector in the front plate.
13 + RxD - TxD
- RxD
14 + TxD
+ 20 mA
- 20 mA
+ 20 mA
- 20 mA
+ TxD
- RxD
10
+ RxD
19 - TxD
Shield
1
Interface Submodule
IM 512
14
Transmitter
2
5
+ 24 V
17
6
+ 24 V
18
15
Receiver
3
Housing
23
2 2
11
24
Device ID
12
25
0
2
13
5
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