Siemens S5-135U/155U System Manual page 250

CPUs, Memory Cards, Memory Submodules, Interface Submodules
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.
CPU
Receiver
Transmitter
Housing, GND
Figure 5-23 TTY Submodule: Connecting Cable CPU - IM 512
5-110
13 + RxD – TxD
– RxD
14 + TxD
+ 20mA
– 20mA
+ 20mA
– 20mA
+ TxD – RxD
10
19 + RxD
– TxD
Shield
1
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
System Manual
C79000-G8576-C199-06