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NPort 5600 Series User’s Manual Configuring NPort Administrator
5-20
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 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, Delimiter + 1, Delimiter +
2, Strip Delimiter
Do Nothing Required
When [Delimiter + 1] or [Delimiter + 2] is selected, the data will be transmitted when an
additional byte (for Delimiter +1), or an additional 2 bytes (for Delimiter +2) of data is received
after receiving the Delimiter.
When [Strip Delimiter] is selected, when the Delimiter is received, the Delimiter is deleted (i.e.,
stripped), and the remaining data is transmitted.
When [Do nothing] is selected, 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’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 fetches the serial data from its
internal buffer. If data is incoming through the serial port, NPort stores the data in the internal
buffer. 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.
The optimal Force transmit timeout depends on 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 none for 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 the series of characters in the same packet, the serial device attached to
NPort should send that series of characters during a time interval less than the Force Transmit
timeout for NPort, and the total length of data must be less than or equal to NPort’s internal buffer
size. The serial communication buffer size for NPort is 1 KB per port.