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NPort IA5150/5250 Series User’s Manual Web Console Configuration
5-15
TCP Server Mode
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: NPort IA5150/5250 automatically closes the TCP connection if there is no TCP
activity for the given time. After the connection is closed, NPort IA5150/5250 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: NPort IA5150/5250 automatically closes the TCP connection if there is no serial data
activity for the given time. After the connection is closed, NPort IA5150/5250 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 IA5150/5250 will check the
connection status between the NPort IA5150/5250 and remote host by sending “keep alive”
packets periodically. If the remote host does not respond to the packet, NPort IA5150/5250
assumes that the connection was closed down unintentionally. NPort IA5150/5250 will then force
the existing TCP connection to close.