Siemens S5-135U/155U System Manual page 251

Connecting cable: CPU - DR 210/211, DR 230/231
You can use this connecting cable with both the TTY and the V.24
submodule. Ensure that you have the same type of interface in the CPU and
in the printer.
CPU
Receiver
Transmitter
V.24 Assignments
Housing,GND
Figure 5-24 TTY Submodule: Connecting Cable CPU - DR 210/211, DR 230/231
System Manual
C79000-G8576-C199-06
CPUs, Memory Cards, Memory Submodules, Interface Submodules
13
+RxD +20mA
14
–RxD +TxD
+TxD +20mA
10
–TxD +RxD
19
5
3
2
7
Shield
1
DR 210/211, DR 230/231
21
+24V
18
Transmitter
10
+24V
9
Receiver
25
2
V.24 Assignments
3
7
1
Housing
5-111