Westermo MRD-3x0 - Manual (Page 156)

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7 Serial Server
The serial server is used to transfer data between a physical
serial port and an IP connection. The IP connection can be
via the Ethernet or the wireless connection of the unit. The
remote host that connects to the serial server could be a
SCADA master, desktop PC or even another unit.
7.1 Selecting a port function
Each port of the serial server can be configured to operate
with a different function. The function selected for an applica-
tion will be determined by the serial equipment attached to
the port and the type of IP connection required. The unit
offers the following functions:
Disabled
Serial server functionality is disabled for the port.
Raw TCP Client/Server
The serial server function create a transparent pipe between
the serial port and a TCP network connection. Example uses
of this mode include connecting to a remote PC running serial
port redirector software with virtual COM ports or connect-
ing two units back-to-back to create a serial bridge.
Raw UDP
This function is similar to Raw TCP Client/Server mode, but
uses UDP as the network transport. UDP has lower over-
heads than TCP, but as UDP offers no lost packet detection,
this function should only be used with serial protocols than
can provide the necessary error correction.
Unit Emulator
The serial server provides an AT command interface at the
serial port that simulates a traditional dial-up unit. However,
instead of dialing out phone calls, the emulator creates TCP
network connections. The emulator will also simulate incom-
ing calls if it receives a TCP connection. The function is suited
to applications where equipment attached to the serial port
expects to see a dial-up unit.