Moxa Technologies NPort IA 5250 series User Manual page 42

NPort IA5150/5250 Series User's Manual
Delimiter 2
Setting
00 to FF (hex)
Once the NPort IA5150/5250 receives both delimiters through its serial port, it immediately packs
all data currently in its buffer and sends it to the NPort IA5150/5250'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 IA5150/5250 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
Do nothing
Delimiter + 1
Delimiter + 2
Strip Delimiter
[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
0 to 65535 ms
0: Disable the force transmit timeout.
1 to 65535: Forces the NPort IA5150/5250'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 IA5150/5250 fetches the serial data
from its internal buffer. If data is incoming through the serial port, NPort IA5150/5250 stores the
data in the internal buffer. NPort IA5150/5250 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 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 a series of characters in the same packet, the serial device attached to
Web Console Configuration
Factory Default
None
Factory Default
Do Nothing
Factory Default
0 ms
5-17
Necessity
Optional
Necessity
Optional
Necessity
Optional