Westermo MRD-3x0 - Manual (Page 157)

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DNP3 IP-Serial Gateway
The serial server will act as a DNP3 outstation to be polled
by a SCADA master. The outstation mode is configurable as
a TCP listen endpoint, TCP dual-function endpoint or UDP
endpoint.
Modbus IP-Serial Gateway
The serial server will perform conversion from Modbus/
TCP to Modbus/RTU or Modbus/ASCII, allowing polling by a
Modbus/TCP master.
Telnet (RFC 2217) Server
The serial server will function as a Telnet server, including the
protocol extensions defined in RFC 2217. In addition to trans-
porting data, this mode also allows a remote PC with appro-
priate software to change the port configuration (baud rate
etc) and read and write the handshaking lines during a session.