3.1 Mounting and Connections
389
7SA522 Manual
C53000-G1176-C155-3
Jumper Setting 2-3: The connection to the modem is usually done with star coupler
or fibre-optic converter. Therefore the modem control signals according to RS232
standard DIN 66020 are not available. Modem signals are not required since the con-
nection to SIPROTEC
®
4 devices is always carried out in the half duplex mode. Please
use connection cable with order number 7XV5100-4.
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.
RS485 Interface 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 3-9.
Figure 3-10 Position of terminating resistors and the plug-in jumpers for configuration of the
RS485 interface
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