Moxa Technologies NPort 5200 Series User Manual page 39

Force transmit
Setting
0 to 65535 ms
0: Disable the force transmit timeout.
1 to 65535: Forces the NPort 5200'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 5200 fetches the serial data from its
internal buffer. If data is incoming through the serial port, NPort 5200 stores the data in the
internal buffer. NPort 5200 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 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
NPort 5200 should send that series of characters during a time interval less than the Force transmit
timeout for NPort 5200, and the total length of data must be less than or equal to NPort 5200's
internal buffer size. The serial communication buffer size for NPort 5200 is 1 KB per port.
Local TCP port
Setting
1 to 65535
The"Local TCP port" is the TCP port that NPort 5200 uses to listen to connections, and that other
devices must use to contact NPort 5200. To avoid conflicts with well known TCP ports, the
default is set to 4001.
Command port
Setting
1 to 65535
The "Command port" is a listen TCP port for IP-Serial Lib commands from the host. In order to
prevent a TCP port conflict with other applications, the user can set the Command port to another
port if needed. IP-Serial Lib will automatically check the Command Port on NPort 5200 so that
the user does not need to configure the program.
Web Console Configuration
Factory Default
0 ms
Factory Default
4001
Factory Default
966
NPort 5200 Series User's Manual 5-15
Necessity
Optional
Necessity
Required
Necessity
Optional