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.