Siemens SIPROTEC 7SJ62 Manual page 415

RS232/RS485
The service interface (Port C) can be converted into an RS232 or RS485 interface by modifying the setting of
the appropriate jumpers.
Jumpers X105 to X110 must be set to the same position !
The presetting of the jumpers corresponds to the configuration ordered.
Table 3-15
Jumper
X103 and X104
X105 to X110
With interface RS232 jumper X111 is needed to activate CTS which enables the communication with the
modem.
CTS (Clear to Send)
Table 3-16
Jumper
X111
1)
Presetting
Jumper setting 2-3: The modem connection is usually established with star coupler of fiber optic converter.
Therefore the modem control signals according to RS232 standard DIN 66020 are not available. The 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.
The jumper setting 2-3 is also necessary when using the RTD-box in half duplex operation.
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 X111 must be plugged in position 2-3.
If there are no external matching resistors in the system, the last devices on a RS485 bus must be configured
using jumpers X103 and X104.
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
Jumper settings of the integrated RS232/RS485 Interface on the C–CPU-2 board
RS232
1-2
1-2
Jumper setting for CTS on the C-CPU-2 board
/CTS from Interface RS232
1-2
RS485
1-2
2-3
/CTS triggered by /RTS
Mounting and Commissioning
3.1 Mounting and Connections
1)
2-3
415