Siemens SIPROTEC 4 User Manual page 402

Mounting and Commissioning
3.1 Mounting and Connections
[steckbruecken-rs232-020313-kn, 1, en_US]
Figure 3-22
Terminating resistors are not required. They are permanently disconnected.
Jumper X11 enables the flow control (CTS) feature which is important for modem communication.
Table 3-30
Jumper
X11
1) Default setting
Jumper setting 2-3: The modem connection is usually established with star coupler or 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.
Jumper setting 2-3 is equally required when operating the RTD box in half-duplex mode.
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
i
i
For a direct connection to DIGSI with interface RS232, jumper X11 must be plugged in position 2-3.
RS485 Interface
The following figure shows the location of the jumpers of interface RS485 on the interface module.
Interface RS485 can be modified to interface RS232 and vice versa, according to
402
Location of the jumpers for configuration of RS232
Jumper setting for CTS (Clear to Send) on the interface module
/CTS from interface RS232
1-2
/CTS controlled by /RTS
2-3 1)
Figure 3-22.
SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016