NPort 5000 Series User Manual
81
Parameter
Setting
Factory
Default
Description
Necessity
Force Transmit
0 to 65535 ms
0 ms
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 the NPort fetches the serial data from its
internal buffer. If data is incoming through the
serial port, the NPort stores the data in the
internal buffer. The 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.
Optional
NOTE
Optimal force transmit timeout differs according to 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 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. Force Transmit timeout is
specified in milliseconds and must be larger than 10 ms.
If you want to send the series of characters in a packet, the serial device attached to the NPort should
send characters with time delay less than Force Transmit timeout between characters and the total length
of data must be smaller than or equal to the NPort’s internal buffer size. The serial communication buffer
size of the NPort is 1 Kbyte per port.
TCP Server Mode
Web Interface for the NPort 5100, 5200, and IA5000 Series Only