Siemens SIMATIC NET TeleControl SINAUT ST7, Системное руководство

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Installation and commissioning of the modems and routers
5.5 MD2 dedicated line modem
SINAUT ST7 station control system
168
System Manual, 09/2016, C79000-G8976-C178-10
Table 5- 15 Default settings for the WAN terminating resistors
Attachment type Baud rate Setting on DIL switch Remark
End point
2-wire (channel 1)
2 x 2-wire (channel 1+2)
4-wire
1200 bps
2400 bps
The MD2 is located at the beginning or end of
a 2-wire or 4-wire line and is set to a trans-
mission speed of 1200 or 2400 bps.
9600 bps
19200 bps
End point as above but with transmission
speed set to 9600 or 19200 bps.
Tapping point
2-wire (channel 1)
1200 bps
2400 bps
The MD2 is not located at the beginning or
end of a 2-wire line; it taps into this 2-wire line
along the way with high resistance. The
transmission speed is set to 1200 or 2400
bps.
9600 bps
19200 bps
End point as above but with transmission
speed set to 9600 or 19200 bps.
Tapping point
4-wire
1200 bps
2400 bps
9600 bps
19200 bps
The MD2 is not located at the beginning or
end of a 4-wire line; it taps into this 4-wire line
along the way with high resistance.
Pinout of the RJ-12 Western jack
The X3 connector is designed as a 6-pin RJ-12 Western jack. The pinout is shown in the
following table.
Table 5- 16 Pinout of the X3 RJ-12 Western jack for the MD2 modem
Illustration Pin no. Signal name Signal direction Remark
5 a1 Input or bidirectional (channel 1) With 2-wire: Input and output
channel 1
With 4-wire: Input
2 b1
4 a2 Output or bidirectional (channel 2) With 2-wire: Input and output
channel 2
With 4-wire: Output
3 b2
1 a
RTS
Output Output optical relay
6 b
RTS
The RTS signal can be output over the floating optical relay at pins 1 and 6 of the RJ-12
connector.