Siemens S5-135U/155U 11.3 V.24 Submodule, V.24 submodule can be inserted in the following CPU

CPUs, Memory Cards, Memory Submodules, Interface Submodules

5.11.3V.24 Submodule

The V.24 submodule is used with the RK 512 computer link, data transmission with procedures 3964/3964R, data transmission with the ªopen driver.º

Application The V.24 submodule can be inserted in the following CPU:

Interface Submodule...

For use With ...

V.24 submodule

CPU 928B CPU 948

Circuitry	The following figure shows the circuitry for the V.24 interface (transmit and
	receive lines):
		Device 1	Device 2
		GND	GND
		TxD	TxD
		RxD	RxD
		Shield	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 ªopen driver.º (Exception: RTS/CTS with the ªopen driverº).

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.

System Manual	5-99
C79000-G8576-C199-06