NPort 5100 Series User’s Manual Choosing the Proper Operation Mode
4-4
TCP Client Mode
In TCP Client Mode, the NPort 5100 can
actively establish a TCP connection with a
pre-determined host computer when serial data
arrives.
After the data has been transferred, the NPort
5100 can disconnect automatically from the host
computer by using the TCP alive check time or
Inactivity time settings. Refer to Chapter 5 for
detailed configuration instructions.
As illustrated in the figure, data transmission
proceeds as follows:
1. The NPort 5100 configured for TCP Client
Mode requests a connection from the host.
2. Once the connection is established, data can
be transmitted in both directions—from the
host to the NPort 5100, and from the NPort
5100 to the host.
UDP Mode
Compared to TCP communication, UDP is faster
and more efficient. In UDP mode, you can
unicast or multicast data from the serial device to
one or multiple host computers, and the serial
device can also receive data from one or multiple
host computers, making this mode ideal for
message display applications.
Pair Connection Mode
Pair Connection Mode employs two NPort 5100 in tandem, and can be used to remove the
15-meter distance limitation imposed by the RS-232/422/485 interface. One NPort 5100 is
connected from its RS-232/422/485 port to the COM port of a PC or other type of computer, such
as hand-held PDAs that have a serial port, and the serial device is connected to the
RS-232/422/485 port of the other NPort 5100. The two NPort 5100 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 NPorts.
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