NPort 5100A Series Web Console Configuration
TCP alive check time
Setting Factory Default Necessity
0 to 99 min 7 min Optional
0 min: TCP connection is not closed due to an idle TCP connection.
1 to 99 min: The NPort 5100A automatically closes the TCP connection if there is no TCP activity for the given
time. After the connection is closed, the NPort 5100A starts listening for another host’s TCP connection.
Inactivity time
Setting Factory Default Necessity
0 to 65535 ms 0 ms Optional
0 ms: TCP connection is not closed due to an idle serial line.
0-65535 ms: The NPort 5100A automatically closes the TCP connection if there is no serial data activity for the
given time. After the connection is closed, the NPort 5100A starts listening for another host’s TCP connection.
This parameter defines the maintenance status as Closed or Listen for the TCP connection. The connection is
closed if there is no incoming or outgoing data through the serial port during the specific Inactivity time.
If the Inactivity time is set to 0, the current TCP connection is kept active until a connection close request is
received. Although Inactivity time is disabled, the NPort 5100A will check the connection status between the
NPort 5100A and remote host by sending “keep alive” packets periodically. If the remote host does not respond
to the packet, the NPort 5100A assumes that the connection was closed down unintentionally. The NPort 5100A
will then force the existing TCP connection to close.
he Inactivity time should at least be set larger than that of the Force transmit timeout. To prevent the
unintended loss of data due to the session
being
disconnected, it is highly recommended that this value is set
large enough so that the intended data transfer is completed.
Max connection
Setting Factory Default Necessity
1, 2, 3, 4, 5, 6, 7, 8 1 Required
Max connection is usually used when the user needs to receive data from different hosts simultaneously. The
factory default only allows 1 connection at a time.
Max. connection 1: The NPort only allows 1 host to open the TCP connection to the specific serial port.
Max connection 2 to 8: Allows 2 to 8 host’s TCP connection request to open this NPort 5100A’s serial port, at
the same time. When multiple hosts establish a TCP connection to the specific serial port at the same time, the
NPort 5100A will duplicate the serial data and transmit to all of the hosts. Ethernet data is sent on a
first-in-first-out basis to the serial port when data comes into the NPort 5100A from the Ethernet interface.
Ignore jammed IP
Setting Factory Default Necessity
No or Yes No Optional
Previously, when Max connections > 1, and the serial device is transmitting data, if any one of the connected
hosts is not responding, it will wait until the data has been transmitted successfully before transmitting the
second group of data to all hosts. Currently, if you select Yes for “Ignore jammed IP,” the host that is not
responding will be ignored, but the data will still be transmitted to the other hosts.
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