The advanced RTU module can be used with several external modem types:
There are three different ways to connect an external modem to the advanced RTU module:
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via the serial port, using serial communication protocol (IEC 60870-5-101 or DNP3 serial)
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via the serial port and configuring a Point-to-Point Protocol (PPP) connection, using ethernet communication protocol (IEC 60870-5-104 or DNP3 NET)
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via the ethernet port and configuring a Point-to-Point Protocol over Ethernet (PPPoE) connection, using ethernet communication protocol (IEC 60870-5-104 or DNP3 NET)
NOTE: PPPoE connection is only used with an ADSL external modem.
