Siemens SIMATIC NET SINAUT ST7 System Manual page 245

Note
The transmission speeds 1200 and 2400 bps are suitable for lines whose bandwidth is
limited to the normal voice band (300 Hz – 3400 Hz). This is typically the case with lines
leased from public telephone companies. For the MD2 modem, there is an approval from the
German Telekom for connection to transmission paths with analog connection points (2-
wire) and 3.1 kHz effective bandwidth (300 Hz – 3400 Hz).
Table 6-15
Setting on DIL switch
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
Settings on the 10-pin DIL switch
Meaning
Normal mode
Set this mode when the MD2 is connected to a TIM over its RS-232
port.
Repeater
Set this mode when two MD2s are connected together to form a
repeater. The other parameters such as transmitter level, 2- or 4-wire
and the baud rate must be set at the 5-pin DIL switch.
Interface with RS-485
Set this mode when the MD2 is connected to a TIM or other MD2
over its RS-485 port.
Test mode: Test f H constant *)
In this test mode, the upper keying frequency is output permanently
at the transmitter output of the modem. This mode can be used for
level measurement.
Test mode: Test send RS-485 *)
In this test mode, a short message (2 bytes) in the asynchronous 11-
bit format is output permanently at the transmitter output of the
modem and on the RS-485 interface.
Test mode: Test send *)
In this test mode, a short message (2 bytes) in the asynchronous 11-
bit format is output permanently at the transmitter output of the
modem.
Test mode: Test receive *)
This test mode, along with the "Test send RS-485" and "Test send"
test modes, checks the function of the transmission line and the
receiver unit of the modem.
Installing and putting a SINAUT modem into operation
6.4 MD2 dedicated line modem
245