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NPort 5600 Series User’s Manual Configuring NPort Administrator
5-15
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 automatically closes the TCP connection if there is no serial data activity for
the given time. After the connection is closed, 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 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 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, NPort assumes that the connection was closed down
unintentionally. NPort will then force the existing TCP connection to close.
ATTENTION
The Inactivity time should at least be set larger than that of 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 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:
NPort only allows 1 host to open the TCP connection to the specific serial port.
Max connection 2 to 4:
Allows 2 to 4 host’s TCP connection request to open this NPort serial port, at the same time. When
multiple hosts establish a TCP connection to the specific serial port at the same time, NPort 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 NPort from the Ethernet interface.
Ignore jammed IP
Setting Factory Default Necessity
No or Yes No Required
For previous versions of NPort 5200, when Max connections > 1, and the serial device is
transmitting data, if any one of the connected hosts was not responding NPort 5200 would wait
until the data had been transmitted successfully before transmitting the second group of data to all
hosts. For the current version of NPort 5200, 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.