User`s manual

NPort S8000 Series Choosing the Serial Operation Mode
4-3
RFC2217 Mode
RFC-2217 mode is similar to Real COM mode. That is, a driver is used to establish a transparent connection
between a host computer and a serial device by mapping the serial port on the NPort S8000 to a local COM port
on the host computer. RFC2217 defines general COM port control options based on the Telnet protocol. Third
party drivers supporting RFC-2217 are widely available on the Internet and can be used to implement Virtual
COM mapping to your NPort S8000 serial port(s).
TCP Server Mode
In TCP Server mode,
the NPort S8000 provides a unique IP port
address on a TCP/IP network.
The
NPort S8000 waits passively to be
contacted by the host computer, allowing the host computer to
establish a connection with and get data from the serial device. This
operation mode also supports up
to 8
simultaneous connections, so
that multiple hosts can collect data from the same serial device
—
at
the same time.
As illustrated in the figure, data transmission proceeds as follows:
1.
The host requests a connection from the NPort configured for
TCP Server Mode.
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.
TCP Client Mode
In TCP Client mode,
the NPort S8000
can actively establish
a TCP connection to a pre
-defined host computer when
serial data arrives.
After the data has been transferred,
the NPort S8000
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.