Siemens SIMATIC NET SINAUT ST7 System Manual page 180

Installing and putting a TIM into operation
5.4 Options for attachment and settings of the TIM 3 and TIM 4 variants
Setting on
DIL switch
180
Meaning
Transmit level 0 dB / -9 dB
This allows the distance to be increased without regeneration.
For more detailed information, refer to the description of the 10-pin DIL
switch at switch 10.
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 control center 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)
At this speed, the modem is compatible with SINAUT ST1 modems MD100,
MD124 and LGM 1200H1.
Baud rate 2400 bps (see also note)
At this speed, the modem is compatible with the SINAUT ST1 MD124
modem.
Baud rate 9600 bps
Baud rate 19,200 bps
At this speed, the modem is compatible with the SINAUT ST1 MD124
modem.
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06