Moxa Technologies 5400 - Manual (Page 25)

Choosing the Proper Operation Mode
TCP Client Mode
In TCP Client mode, NPort can actively establish a TCP
connection to a pre-defined host computer when serial
data arrives.
After the data has been transferred, NPort can
automatically disconnect from the host computer by
using the TCP alive check time or Inactivity time
settings. Refer to chapter 5 for more details.
As illustrated in the figure, data transmission proceeds as
follows:
1. The NPort 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, and from the NPort to the host.
UDP Mode
Compared to TCP communication, UDP is faster and
more efficient. In UDP mode, you can 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 ideal for
message display applications.
Real COM Mode
NPort comes equipped with COM drivers that work with
Windows 95/98/ME/NT/2000/XP systems, and also TTY
drivers for Linux systems. The driver establishes a
transparent connection between host and serial device by
mapping the IP:Port of the NPort’s serial port to a local
COM/TTY port on the host computer. This operation mode
also supports up to 4 simultaneous connections, so that
multiple hosts can collect data from the same serial device
at the same time.
NPort 5400 Series User’s Manual 4-3