Installation and Commissioning
8-38 7SA6 Manual
C53000-G1176-C156-2
be selected optionally. We recommend to use a standard RS232 modem connection
cable (converter 9-pole on 25-pole).
Note: For a direct connection to DIGSI
®
4 with interface RS232 jumper X11 must be
plugged in position 2–3.
Interface RS485 Interface RS485 can be modified to interface RS232 according to Figure 8-20.
Busbar capable interfaces require a termination at the last device of the bus, i.e. ter-
minating resistors must be connected. For 7SA6 this applies to the variant with inter-
face RS485.
The terminating resistors are located on the corresponding interface module that is
mounted to the processor input/output board C–CPU–2. Figure 8-19 shows the print-
ed circuit board of the C–CPU–2 and the order the modules are mounted.
The module for interface RS485 is illustrated in Figure 8-21, the module for Profibus
in Figure 8-22.
For the configuration of the terminating resistors both jumpers have to be plugged in
the same way.
With default setting, jumpers are plugged in such a way that terminating resistors are
disconnected.
Figure 8-21 Location of jumpers for the configuration of terminating resistors of interface
RS485
X3
132
X10
132
8X
1
3
2
X12
132
C53207-
A324-B180
1
3
2
X11
X6
X7
X4
X5
132
1
3
2
X13
Jumper
Terminating Resistors
connected disconnected
X3 2–3 1–2 *)
X4 2–3 1–2 *)
*) Default Setting
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