Siemens SIPROTEC 7VU681 User Manual page 67

Note
For a direct connection to DIGSI with interface RS232 jumper X111 must be plugged in position 2-3.
If there are no external terminating resistors in the system, the last devices on a RS485 bus must be configured
via jumpers X103 and X104.
Table 3-7
Jumper
X103
X104
Note
Both jumpers must always be plugged in the same way!
Jumper X90 has currently no function. The factory setting is 1-2.
The terminating resistors can also be connected externally (e.g. to the connection module). In this case, the
terminating resistors located on the RS485 or PROFIBUS interface module or directly on the PCB of the
processor board C-CPU-2 must be de-energized.
Figure 3-4
SIPROTEC, 7VU681, User Manual
C53000-G1176-C368-1, Release Date 07.2012
Jumper settings of the Terminating Resistors of interface RS485 on the C-CPU-2 processor
Terminating Resistor
Connected
2-3
2-3
Termination of the RS485 interface (external)
Terminating Resistor Dis-
connected
1-2
1-2
Mounting And Commissioning
3.1 Mounting And Connections
Presetting
1-2
1-2
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