Siemens SIMATIC NET SINAUT ST7 System Manual page 301

Front view of the MD4 with removed front panels
The following figure once again shows the front view of the MD4 modem, here, however, the
front panels have been removed to show the connectors located behind them.
Figure 6-46
Pinout of the RS-232 and RS-485 ports
The X1 connector is designed as a 9-pin D-sub miniature male connector. The pinout is
shown in the following table. As an RS-232 port, the pinout corresponds to that of a
standardized PC connector.
The RS-232 interface can be activated using a 4-pin DIL switch accessible from below
through the housing grill.
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
s
X3
M
L+
DC
24V
M
Front view of the MD4 modem with removed front panels
Installing and putting a SINAUT modem into operation
X
X2
6.7 ISDN dial-up modem MD4
301