Siemens S5-135U/155U System Manual page 249

Standard Connect-
Standard cables for connecting the TTY submodule in the CPU to the partner
ing Cables for the
station are available from Siemens in various lengths, up to 1000 m.
TTY Submodule
Order numbers and lengths can be found in the ordering information.
Connecting cable for CPU, CP 524, CP 525, CP 544
CPU, CP 524/525, CP 544
Receiver
+24V
Transmitter
Housing, GND
Figure 5-22 TTY Submodule: Connecting cable for CPU, CP 524, CP 525, CP 544
System Manual
C79000-G8576-C199-06
CPUs, Memory Cards, Memory Submodules, Interface Submodules
13 +RxD –TxD
14 –RxD +TxD
+20mA
21 –20mA
–20mA
12 +20mA
10 +TxD –RxD
19 –TxD +RxD
Shield
1
CPU, CP 524/525, CP544
19
Transmitter
10
12
+24V
21
14
Receiver
13
1
Housing, GND
5-109