Siemens 7XV5653-0BA00

A 01/13 2-channel Binary Signal Transducer Page 19 of 40
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Page 18 of 40 2-channel Binary Signal Transducer A 01/13
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Example for testing the modem communication:
The modems can not be connected directly via a short pilot pair in
testing/laboratory mode. In this case the connecting cable should
have a small resistance transmission errors otherwise the receiver
of the modem is disturbed by a to high transmission level. For this
reason we recommend to install a resistor of 470 Ω in each of the
connections (also see figure below).
• Settings at the binary signal transducer 7XV5653
When binary signals are transmitted baud rates and data formats of
both RS232 are to be set as equal.
The baud rate of the RS232 interface should not be higher than the rate
of the transmission link. If settings are chosen as shown in these
instructions the modems are connected at a rate of 28800 baud. Stan-
dard setting 8N1 was chosen as data format between the converter and
the modem.
For 19200 bd:
UP
¦¦ ¦¦
¦¦
¦¦
¦¦
¦¦
off
DOWN
¦¦ ¦¦
on
1
2
3
4
5
6
7
8
• Connecting cable modem - binary signal transducer 7XV5653
The cable from the modem (25-pole pin) to the binary signal transducer
(9 pole pin) has the following connections and bridges:
2
3
7
6
20
Housing
3
2
TxD
RxD
GND
Modem
25pole pin
Length max. 3 m
4
5
Binary signal-
transformer.
9pole pin
5
Housing
7
8
Fig. 2: Assignment of connecting cable modem - binary signal
transducer
1.2.3 Binary signal transmission via leased line
modem MT2834BLG by company MultiTech in four-
wire operation (firmware 3.16d)
• Setting the DIP switches at the modem
Before the modem is initialized the DIP switches are to be set as follows:
off Up
¦¦ ¦¦ ¦¦ ¦¦
on
Down
1
2
3
4
5
*
*
116 127 138
*) modem-1 DIP switch 5 off, modem-2 DIP switch 5 on
149 1510 16
Attention! Switch off modem for setting.
The changed settings are adopted only with the switching on of the
modem.