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English
Description of Interfaces, DIP Switches and Displays
The Serial Modem has the following connectors:
• A switchable RS232/RS485 interface (9-way SubD male connector)
• FO transmitter and receiver port with ST connectors
• Ethernet connector (10BaseT) for a 10/100 Mbit network
• DIP switches for RS232/RS485 switchover and RS485 termination and for setting the
FO idle state
• AC/DC power supply and protective conductor (PE) connection via 3-way screw
terminal
Communications Interfaces
The RS232/RS485 or FO interfaces are controlled internally by the same processor
interface. The interface is selected via the DIP switches. You can choose between RS232
or RS485; the FO interface always works parallel with RS232 or RS485 at the transmitter
end and is ORed with RS232/485 at the receiver end, that is, both streams of receive data
are unlocked and are received and evaluated with equal priority. To rule out data collisions,
the connected protection units are addressed selectively by DIGSI®. This is done via the
address of the protection units.
Fig. 3: Connectors and DIP switch positions
/ RS232
11 / 77
RS232 Interface
The terminal device (protection unit) (e.g. a
SIPROTEC
4 unit) or a further device from the
®
Siemens accessory program (e.g. a 7XV5300 or
7XV5450 star coupler for operating two or more
SIPROTEC
devices) can be connected directly to
®
the RS232 port. The data is exchanged between
the protection unit and the Serial Modem via this
interface. Using a terminal program on the PC /
notebook, e.g. "HyperTerminal" from WINDOWS®,
it is possible to initialise the Serial Modem with AT
commands.
To use the RS232 interface, DIP switch S2-1 must
be set to RS232 and DIP switches S1-1+2 to
(RS485 termination) OFF. The DIP switch for the
FO idle state (S2-2) must be OFF.
Note: The factory settings for all interfaces are
9600 baud / data format 8N1. The settings are
automatically adapted to the terminal device's
interface by the application (e.g. DIGSI) on
connection.
7XV5655-0BB00
C53000-G1176-C175-2
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