Manual 7XV5655-0BB00
SIEMENS AG
Page 13 of 79
C53000-G1176-C175-3
To use the FO interface, DIP switch S2-2 must be set to match the FO idle state of the
communications partner (ON or OFF). DIP switch S2-1 for RS232/485 selection must
be set to RS232. DIP switches S1-1 and S1-2 must be set to OFF (see Fig. 5).
On SIPROTEC units, the idle state is pre-set to OFF. This is also the factory setting of
the Serial Modem.
The 9-way RS232 interface can be used in parallel. If it is not, please cover it with
the red protective cover included in the scope of supply !
If the FO interface is not used, it must also be covered with the protective covers
included in the scope of supply.
Ethernet Interface (10BaseT)
The Ethernet interface 10BaseT (RJ45) is connected via an Ethernet patch cable (1:1,
not cross-over) directly to the output of a router or switch. The data packed in the
TCP/IP protocol is transmitted to and received by the Ethernet via this interface.
By using the configuration tool on a PC with an Ethernet interface and a cross-over
Ethernet patch cable connected directly to the Serial Modem, it is possible to configure
the Serial Modem as well.
The configuration tool is included in the scope of supply.
Auxiliary Voltage
The auxiliary voltage V
aux
(AC/DC) and the protective earth conductor are connected via
three terminals. The wide-range power supply unit has reverse polarity protection
(terminals L+ and L- could be exchanged to AC and DC operation) and can
for example
be used in substations with substation batteries. It features double or reinforced
insulation and backs up the auxiliary voltage for >50ms.
DR Contact
The isolated DR contact (device run) is for alarming faulty device states. The device
internally monitors the supply voltage and proper functioning of the device.
The contact is open in the normal operating state and closes on faults and auxiliary
voltage failure. It is connected via two terminals (GOK 1+2).
