User's Manual Part 1

NPort W2004 User’s Manual Web Console Configuration
5-14
ATTENTION
Delimiter 2 is optional. If left blank, then Delimiter 1 alone trips clearing of the buffer. If the size
of the serial data received is greater than 1 KB, the NPort W2004 will automatically pack the
data and send it to the Ethernet. However, to use the delimiter function, you must at least enable
Delimiter 1. If Delimiter 1 is left blank and Delimiter 2 is enabled, the delimiter function will not
work properly.
Force transmit
Setting Factory Default Necessity
0 to 65535 ms 0 Optional
0: Disable force transmit timeout.
1 to 65535: Forces the NPort W2004’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 NPort W2004 fetches the serial data from its
internal buffer. If data is incoming through the serial port, NPort W2004 stores the data in the
internal buffer. NPort W2004 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.
The optimal Force transmit timeout depends on your application, but it must be at least larger than
one character interval within the specified baud rate. 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 to be larger than 8.3 ms, so in this case, it must be greater
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
Local TCP Port
Setting Factory Default Necessity
1 to 65535 4001 Required
The “Local TCP port” is the TCP port that NPort W2004 uses to listen to connections, and that
other devices must use to contact NPort W2004. To avoid conflicts with well known TCP ports,
the default is set to 4001.