Siemens S5-135U/155U - Page 253

5-113
System Manual
C79000-G8576-C199-06
A maximum of 19200 bps is permissible for data transmission with the
RS422 A/485 submodule when used in a CPU.
Shown in the following figure are the pin assignments of the 15-pin
subminiature D-type connector in the front plate of the RS422 A/485
submodule:
Pin Des. to
CCITT V.24
Input/
Output
Remarks
1 Shield
8
2 T(A) Output
8
15
3 C(A) Output
4 R(A) Input/Output In full duplex operation, only data
can be received on this two-wire
line.
5 I(A) Input
9
6 S(A) Input
9
1
7 B(A) Output
8 GND
9 T(B) Output
10 C(B) Output
11 R(B) Input/Output In full duplex operation, only data
can be received on this two-wire
line.
12 I(B) Input
13 S(B) Input
14 B(B) Output
15 X(B) Input
Data Transmission
Rate
Pin Assignments
of the RS422 A/485
Submodule
CPUs, Memor
y
Cards, Memor
y
Submodules, Interface Submodules