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
162
System Manual, 09/2016, C79000-G8976-C178-10
Table 5- 13 Settings on the 5-pin DIL switch
Setting on
DIL switch
Meaning
Transmit level –6 dB / -15 dB
For more detailed information, refer to the description of the 10-
pin DIL switch at switch 10.
Transmit level 0 dB / -9 dB
For more detailed information, refer to the description of the 10-
pin DIL switch at switch 10.
This allows the distance to be increased without regeneration.
4-wire mode
This setting is necessary if a separate wire pair is used for the
transmit and for the receive direction. In this mode, the setting
of switch 3 is irrelevant.
2-wire mode
This setting is necessary if a common wire pair is used for the
transmit and receive direction. In this mode, the setting of
switch 3 is relevant. This is then used to set whether only one 2-
wire line is actually connected (channel 1) or whether two 2-wire
lines are connected (channel 1+2), for example, in a master
station when communication to the stations is over two separate
2-wire connections (’small star network’).
Channel 1 (2-wire)
In 2-wire mode, only channel 1 is used; in other words, only one
2-wire line is connected to the modem (see also switch 2).
Channel 1+2 (2-wire)
In 2-wire mode, channels 1+2 are used; in other words, two
separate 2- wire lines are connected to the modem (see also
switch 2).
Baud rate 1200 bps (see also note)
Baud rate 2400 bps (see also note)