Siemens SINAUT ST7 System Manual page 243

Settings with the DIL switches accessible from below
A further 4-pin DIL switch on the bottom of the modem housing is accessible from below.
This DIL switch is used to activate either the RS-232 or RS-485 interface. For RS-485
operation, you can also activate the terminating resistor. The following figure shows the
possible settings in general.
Figure 5-35
Pinout of the X3 RJ-12 jack
The X3 connector of the MD3 modem is designed as a 6-pin RJ-12 Western jack. The pinout
is shown in the following table.
Table 5- 34 Pinout of the X3 RJ-12 jack for the MD3 modem
Illustration
Standard connecting cable for the RJ-12 port
The connecting cable 6NH7700-3BR60 ships with every MD3 modem. It allows the modem
to be connected to a TAE6 telephone outlet for dial-up mode or with an LTOP voltage
protection module for dedicated line mode.
The connecting cable can also be ordered as a spare under the number shown.
Station control system
System Manual, 07/2009, C79000-G8976-C178-07
Configuration switches on the 4-pin DIL switch accessible from below
Pin no. Signal name
1 E
2 a2
3 b1
4 a1
5 b2
6 G
Installing and putting a SINAUT modem into operation
5.7 Analog dial-up modem MD3
Signal direction
Bidirectional
Bidirectional
Bidirectional
-
Remark
Ground
Outgoing wire pair (along with
b2)
Incoming wire pair
Outgoing wire pair (along with
a2)
Metering pulse
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