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RS485 Interface
7UT613/63x Manual
C53000-G1176-C160-2
With jumper X11 the flow control which is important for modem communication is en-
abled.
Table 3-20
Jumper setting for CTS (Clear To Send, flow control) on the interface module
Jumper
/CTS from Interface RS232
X11
1)
Default Setting
Jumper setting 2-3: The connection to the modem is usually established with a star
coupler or fibre-optic converter. Therefore the modem control signals according to
RS232 standard DIN 66020 are not available. Modem signals are not required since
the connection to the SIPROTEC 4 devices is always operated in the half-duplex
mode. Please use the connection cable with order number 7XV5100-4.
Jumper setting 1-2: This setting makes the modem signals available, i. e. for a direct
RS232-connection between the SIPROTEC 4 device and the modem this setting can
be selected optionally. We recommend to use a standard RS232 modem connection
cable (converter 9-pin to 25-pin).
Note
For a direct connection to DIGSI with interface RS232 jumper X11 must be plugged in
position 2-3.
Interface RS485 can be modified to interface RS232 and vice versa (see Figures 3-12
and 3-13).
For bus-capable interfaces a termination is necessary at the bus for each last device,
i.e. terminating resistors must be connected.
The terminating resistors are connected to the corresponding interface module that is
mounted to the processor board C-CPU-2. Figure 3-11 shows the PCB C-CPU-2 with
the layout of the boards.
The module for the RS485 Interface is illustrated in Figure 3-13. The module of the
Profibus interface is illustrated in Figure 3-14.
With default setting, jumpers are plugged in such a way that terminating resistors are
disconnected. For the configuration of the terminating resistors both jumpers have to
be plugged in the same way.
1-2
3.1 Mounting and Connections
/CTS controlled by /RTS
1)
2-3
367
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