Siemens SIMATIC NET SINAUT ST7 System Manual page 285

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 6-35 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.
Table 6-36 Standard connecting cable for the RJ-12 port of the MD3 modem
Order no. Description
6NH7700-3BR60 Connecting cable with 2 x RJ-12 Western plug and snap-on
TAE6N plug to connect an MD3 modem (RJ-12) to a
telephone jack (TAE6N) or an LTOP overvoltage protection
module (RJ-12) in dedicated line mode.
Cable length 6 m
Note
The 6NH7700-3BR60 connecting cable has a ferrite at one of the cable ends to suppress
electromagnetic interference over the connecting cable. You should not normally remove the
ferrite. Make sure that the RJ-12 Western connector at the end of the cable with the ferrite is
connected to the modem.
The following table shows the pinout of the RJ-12 Western plug at the modem end of the
standard connecting cable described above and the fitted TAE6N connector.
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
Pin no. Signal name
1 E
2 a2
3 b1
4 a1
5 b2
6 G
Installing and putting a SINAUT modem into operation
6.6 Analog dial-up modem MD3
Signal direction
Bidirectional
Bidirectional
Bidirectional
-
Illustration
Remark
Ground
Outgoing wire pair (along with
b2)
Incoming wire pair
Outgoing wire pair (along with
a2)
Metering pulse
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