User`s manual

NPort 6000 Series User’s Manual Configuring Serial Port Operation Modes
7-8
1200 bps, 8 data bits, 1 stop bit, and no parity. In this case, the total number of bits needed to send
a character is 10 bits, and the time required to transfer one character is
(10 (bits) / 1200 (bits/s)) × 1000 (ms/s) = 8.3 ms.
Therefore, you should set the force transmit time to be larger than 8.3 ms, so in this case, it must
be greater than or equal to 10 ms.
If it is necessary to send a series of characters in the same packet, the serial device will need to
send that series of characters within the specified force transmit time, and the total length of data
must be less than or equal to the NPort 6000’s internal buffer size (1 KB per port).
Socket Applications
TCP Server Mode
TCP alive check time (default=7 min): This field specifies how long the NPort 6000 will wait for
a response to “keep alive” packets before closing the TCP connection. The NPort 6000 checks
connection status by sending periodic “keep alive” packets. If the remote host does not respond to
the packet within the time specified in this field, the NPort 6000 will force the existing TCP
connection to close. For socket and device control modes, the NPort 6000 will listen for another
TCP connection from another host after closing the connection. If TCP alive check time is set to 0,
the TCP connection will remain open even if there is no response to the “keep alive” packets.
Inactivity time (default=0 ms): This field specifies how long the NPort 6000 will wait for
incoming and outgoing data through the serial port before closing the TCP connection. The TCP
connection is closed if there is no incoming or outgoing data through the serial port for the
specified Inactivity time. If this field is set to 0, the TCP connection is kept active until a
connection close request is received.