Moxa Technologies NPort 5400 - Manual (Page 41)

NPort 5400 Series User’s Manual Web Console Configuration
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Delimiter 2
Setting Factory Default Necessity
00 to FF None Optional
Once the NPort receives both delimiters through its serial port, it immediately packs all data
currently in its buffer and sends it to the NPort’s Ethernet port.
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 Optional
[Delimiter + 1] or [Delimiter + 2]: 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.
[Strip Delimiter]: When the Delimiter is received, the Delimiter is deleted (i.e., stripped), and the
remaining data is 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’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 there is incoming data through the serial port, NPort stores 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 as Force Transmit timeout.
Optimal force transmit timeout differs according to your application, but it must be at least as large
as 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 required
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 a series of character in a packet, the serial device attached to 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 NPort’s internal buffer size. NPort’s
serial communication buffer size is 1K bytes per port.