User manual

NPort 5000AI-M12 Series Choosing the Proper Operation Mode
4-4
UDP Mode
Compared to TC
P communication, UDP is faster and more
efficient. In UDP mode, you can not only unicast but also
multicast data from the serial device to multiple host
computers, and the serial device can also receive data
from multiple host computers, making this mode i
deal for
message display applications.
Pair Connection Mode
Pair Connection Mode employs two NPort 5000AI-M12 units in tandem, and can be used to remove the
15-meter distance limitation imposed by the RS-232 interface. One NPort 5000AI-M12 is connected from its
RS-232 port to the COM port of a PC or other type of computer, such as a hand-held PDA, and the serial device
is connected to the RS-232 port of the other NPort 5000AI-M12. The two NPort 5000AI-M12 units are then
connected to each other with a cross-over Ethernet cable, both are connected to the same LAN, or in a more
advanced setup, they communicate with each other over a WAN (i.e., through one or more routers). Pair
Connection Mode transparently transfers both data and modem control signals (although it cannot transmit the
DCD signal) between the two NPort device servers.
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 one of NPort 5000AI-M12’s serial port to the MS-DOS computer’s serial port, it
is possible to use legacy software originally designed to transmit data via modem, but now transmit the data
over the Ethernet.