User`s manual

NPort S8000 Series Basic Settings and Device Server Configuration
5-14
TCP Server Mode
Port Settings
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 automatically closes the TCP connection if there is no serial data activity for the given
time. After the connection is closed, the NPort starts listening for another host’s TCP connection.
This parameter defines the maintenances status as Closed or Listen on 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 value of inactivity time is set to 0, the current TCP connection is maintained until there is connection close
request. Although inactivity time is disabled, the NPort will check the connection status between the NPort and
remote host by sending “keep alive” packets periodically. If the remote host does not respond to the packet, it
assumes that the connection was closed down unintentionally. The NPort will then force the existing TCP
connection to close.
ATTENTION
T
he Inactivity time should at least be set larger than that of Force t
ransmit 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.