User's Manual

NPort W2150A/W2250A Series Introduction to Operation Modes
4-4
UDP Mode
UDP is similar to TCP but is faster and more efficient.
Data can be broadcast to or received from multiple
network hosts. However, UDP does not support
verification of data and would not be suitable for
applications where data integrity is critical. It is ideal
for message display applications.
Pair Connection Modes
Pair Connection Master and Slave modes connect two
NPort device servers over a network for serial
-to-
serial
communication. A device attached to one NPort can
then communicate transparently to a device attached
to the other NPort, as if the two devices were
connected by a serial cable. Both data
and modem
control signals are exchanged, except for DCD signals.
This can be used to overcome traditional limitations
with serial communication distance and introduces
many new possibilities for serial
-
based device control.
Ethernet Modem Mode
Ethernet
Modem mode is designed for use with legacy
operating systems, such as MS
-DOS, that do not
support TCP/IP Ethernet. By connecting the properly
configured NPort serial port to the MS
-
DOS computer’s
serial port, it is possible to use legacy software to
transmit data over the Ethernet when the software was
originally designed to transmit data over a modem.