Siemens S5-135U/155U User Manual
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, Memory Cards, Memory Submodules, Interface Submodules