User's Manual Part 1

NPort W2004 User’s Manual Web Console Configuration
5-12
than or equal to 10 ms.
If you want to send a series of characters in the same packet, the serial device attached to NPort
W2004 should send that series of characters during a time interval less than the Force transmit
timeout, and the total length of data must be less than or equal to NPort W2004’s internal buffer
size. The serial communication buffer size for NPort W2004 is 1 KB per port.
TCP Server Mode
Port 1/2/3/4
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 W2004 automatically closes the TCP connection if there is no serial data
activity for the given time. After the connection is closed, NPort W2004 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 W2004 will check the
connection status between the NPort W2004 and remote host by sending “keep alive” packets
periodically. If the remote host does not respond to the packet, NPort W2004 assumes that the
connection was closed down unintentionally. NPort W2004 will then force the existing TCP
connection to close.