Siemens SINAUT ST7 System Manual page 230

Installing and putting a SINAUT modem into operation
5.7 Analog dial-up modem MD3
The X2 RS-485 connector is designed as a 9-pin D-sub miniature female connector. The
pinout is shown in the following table.
The RS-485 interface can be activated and the terminating resistor activated using a 4-pin
DIL switch accessible from below through the housing grill.
Table 5- 25
Illustration
*) It is advisable to activate the terminating resistor for the RS-485 bus in the connector and not in the modem itself.
Standard connecting cable for the RS-232 and RS-485 port
The TIM module or other terminal device with a suitable interface is connected to the X1 9-
pin RS-232 connector or the 9-pin X2 RS-485 jack.
The following standard connecting cables are available for the X1 connector or X2 jack.
230
Illustration Pin no.
4
5
6
7
8
9
Pinout of the X2 RS-485 connector
Pin no.
1
2
3
4
5
6
7
8
9
Signal name Signal direction
DTR Input
GND
DSR Output
RTS Input
CTS Output
RI / T Output
Signal name Signal direction
Data B Bidirectional
M5
P5
Data A Bidirectional
System Manual, 07/2009, C79000-G8976-C178-07
Remark
Remark
- 0 V for bus termination in
connector
*)
- 5 V for bus termination in
connector
*)
Station control system