19
Radio/modem interface
In order to communicate with the SCADA
system, master station a long-haul radio or
modem is required. The RCU electronics
provides two digital interfaces for the radio:
Serial asynchronous data (serial
interface)
10/100BaseT (Ethernet interface).
The Ethernet interface is not activated for software
versions covered in this instruction manual.
Only one interface can be used at a time.
The use of the Ethernet interface increases
the power consumption of the RCU. A
custom cable is required to connect the
radio/modem to the RCU interface. The
design and construction of this cable must
be performed by the customer referring to
Radio/modem interface electrical section on
page 65, or as a value-added service
provided by Siemens.
Figure 14: Radio/modem interfaces
Item Description
A Ethernet port
B Serial port
A
B
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