User`s manual

NPort S8000 Series Basic Settings and Device Server Configuration
5-20
Force transmit
Setting Factory Default Necessity
0 to 65535 ms 0 ms Optional
0: Disable the force transmit timeout.
1 to 65535: Forces the NPort’s TCP/IP protocol software to try to pack serial data received during the specified
time into the same data frame.
This parameter defines the time interval during which the NPort fetches the serial data from its internal buffer.
If data is incoming through the serial port, the NPort stores the data in the internal buffer. The NPort transmits
data stored in the buffer via TCP/IP, but only if the internal buffer is full or if the force transmit time interval
reaches the time specified under Force Transmit timeout.
Optimal force transmit timeout differs according to your application, but it must be at least larger than one
character interval within the specified baudrate. For example, assume that the serial port is set to 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 Force Transmit timeout to be larger than 8.3 ms. Force Transmit timeout is specified
in milliseconds and must be larger than 10 ms.
If the user wants to send the series of characters in a packet, the serial device attached to the NPort should
send characters without time delay larger than Force Transmit timeout between characters and the total length
of data must be smaller than or equal to the NPort’s internal buffer size. The serial communication buffer size
of the NPort is 1 Kbytes per port.
TCP Client Mode
Destination IP address 1
Setting Factory Default Necessity
IP address or Domain
Address
(E.g., 192.168.1.1)
None Required
Allows the NPort to connect actively to the remote host whose address is set by this parameter.
Destination IP address 2/3/4
Setting Factory Default Necessity
IP address or Domain
Address
(E.g., 192.168.1.1)
None Required
Allows the NPort to connect actively to the remote host whose address is set by this parameter.
TCP port (default=4001): This is the TCP port number assignment for the serial port on the NPort S8000. It is
the port number that the serial port uses to listen to connections, and that other devices must use to contact
the serial port. To avoid conflicts with well known TCP ports, the default is set to 4001.
ATTENTION
Up to 4 connections can be established between the NPort and hosts. The connection speed or throughput may
be low
if one of the four connections is slow
, since the slow connection will slow down the other 3 connections.
ATTENTION
The
“Destination IP address” parameter can use both IP address and Domain Name. For some applications,
the
user
may need to send the data actively to the remote destination domain name.