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Manual 7XV5655-0BA00
Fig. 4: Connectors and DIP switch positions
RS485
Fig. 5: Connectors and DIP switch positions FO
Note: The FO interface is always active with the RS232 interface; the DIP switch (FO-
OFF/FO-ON) only sets the idle state.
C53000-G1176-C174-4
R S485 Interface
6 0 B
The bus-capable RS485 interface
provides a link with increased noise
immunity than the RS232 interface. The
data transfer rate is identical for both
interfaces. The terminal device (e.g.
SIPROTEC
applied, or up to 30 further bus-capable
SIPROTEC
directly to the RS485 port.
To apply the RS485 interface, DIP switch
S2-1 must be set to RS485. The position
of DIP switches S1-1+2 is dependent on
the requirement of a RS485 termination
(the termination is set to ON as the first or
last device on the RS485 bus).
The DIP switch for the FO idle state (S2-
2) must be OFF for idle state = OFF (see
Fig. 4). For the RS485 mode, "half-
duplex" mode it must be set using the
configuration tool (see p. 36 RS232
Interface Settings)!
F O Interface
6 1 B
The FO interface has a transmitter and
receiver port with an ST connector. It is
a noise-immune link and is used
whenever especially high interference
levels are to be expected in the
operating environment, or when
equipotential bonding with the terminal
device must be avoided. The data
transfer rate is that of the RS232
interface. The terminal device (e.g. a
SIPROTEC
from the Siemens accessory program
(e.g. 7XV5300 or 7XV5450 star coupler
for operating two or more SIPROTEC
devices) can be connected directly to
the FO port.
Page 12 of 51
4 device) which is to be
®
devices can be connected
®
4 unit) or a further device
®
®
SIEMENS AG
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