Siemens siprotec SJ62 User Manual page 406

RS485 Interface
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
Figure 3-22 Location of the jumpers for configuration of RS232
Terminating resistors are not required. They are permanently disconnected.
Jumper X11 enables the CTS feature (Clear to Send - flow control), which is impor-
tant for modem communication.
Table 3-34 Jumper setting for CTS (Clear to Send) 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 star
coupler or fiber-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 connection cable with order number 7XV5100-4.
Jumper setting 2-3 is equally required when using the RTD boxes in half-duplex oper-
ation.
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.
The following figure shows the location of the jumpers of interface RS485 on the inter-
face module.
Interface RS485 can be modified to interface RS232 and vice versa, according to
Figure 3-22.
3.1 Mounting and Connections
1-2
/CTS controlled by /RTS
1)
2-3
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