NPort IA5000A Series
Web Console Configuration
5-18
ATTENTION
Delimiter 2 is optional. If left blank, then Delimiter 1 alone trips the clearing of the buffer. If the size of the
serial data received is greater than 1 KB, the NPort IA5000A 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.
Delimiter process
Setting
Factory Default
Necessity
Do Nothing,
Del 1,
Del 2,
Strip Delimiter
Do Nothing
Optional
[Del 1] or [Del 2]: The data will be transmitted when an additional byte (for Del1), or
an additional 2 bytes (for Del2) of data is received after receiving the Delimiter.
[Strip Delimiter]: When the Delimiter is received, the Delimiter is deleted (i.e., stripped), and the remaining
data will be transmitted.
[Do Nothing]: The data will be transmitted when the Delimiter is received.
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 IA5000A’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 IA5000A fetches the serial data from its
internal buffer. If data is incoming through the serial port, the NPort IA5000A stores the data in the internal
buffer. TheNPort IA5000A 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 ideal Force transmit timeout depends on your application, but it must be at least larger than a single
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, so in this case, it must be greater
than or equal to 10 ms.
If the user wants to send a series of characters in the same packet, the serial device attached to the NPort
IA5000A should send that series of characters during a time interval that is less than the Force transmit
timeout for the NPort IA5000A, and the total length of data must be less than or equal to the NPort IA5000A’s
internal buffer size. The serial communication buffer size for NPort IA5000A is 1 KB per port.
Local TCP port
Setting
Factory Default
Necessity
1 to 65535
4001
Required
The “Local TCP port” is the TCP port that the NPort IA5000A uses to listen to connections, and that other
devices must use to contact the NPort IA5000A. To avoid conflicts with well known TCP ports, the default is set
to 4001.
