Siemens SIMATIC NET SINAUT ST7 System Manual page 239

Table 6-11
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 6-12
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, one or more MD2 modems, or another terminal with a suitable interface
can be connected to the 9-pin X1 RS-232 connector or X2 RS-485 connector.
The following standard connecting cables are available for the X1 and X2 connectors.
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
Pinout of the X1 RS-232 connector
Illustration Pin no.
1
2
3
4
5
6
7
8
9
Pinout of the X2 RS-485 connector
Pin no.
1
2
3
4
5
6
7
8
9
Installing and putting a SINAUT modem into operation
Signal name Signal direction
DCD Output
RXD Output
TXD Input
DTR Input
GND
DSR Output
RTS Input
CTS Output
RI / T Output
Signal name Signal direction
Data B Bidirectional
M5
P5
Data A Bidirectional
6.4 MD2 dedicated line modem
Remark
Remark
- 0 V for bus termination in
connector
*)
- 5 V for bus termination in
connector
*)
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