Siemens S5-135U/155U - Manual (Page 239)

5-99
System Manual
C79000-G8576-C199-06
5.11.3 V.24 Submodule
The V.24 submodule is used with the RK 512 computer link, data
transmission with procedures 3964/3964R, data transmission with the “open
driver.”
The V.24 submodule can be inserted in the following CPU:
Interface Submodule... For use With ...
V.24 submodule CPU 928B
CPU 948
The following figure shows the circuitry for the V.24 interface (transmit and
receive lines):
Device 1
GND
TxD
RxD
Shield
Device 2
GND
TxD
RxD
Shield
Figure 5-14 V.24 Interface
Apart from the transmit and receive lines, the V.24 submodule has a number
of control and signaling lines to CCITT Recommendation V.24/V.28.
However, these control signals are not needed and not used for the standard
procedures of communication types RK 512, 3964/3964R and “open driver.”
(Exception: RTS/CTS with the “open driver”).
The following applies to V.24 signals:
Logic 0 is represented by a voltage U
w + 3 V
Logic 1 is represented by a voltage U
v – 3 V
If you fabricate the connecting cables yourself, note that unused inputs at the
partner station may have to be connected to quiescent potential. Further
details can be found in the appropriate manuals and in CCITT
Recommendations V.24/V.28.
Application
Circuitry
CPUs, Memory Cards, Memory Submodules, Interface Submodules