User's Manual

NPort W2150A/W2250A Series Web Console: Serial Port Settings
8-7
Force transmit
Default 0 ms
Options 0 to 65535
Description This field controls data packing by the amount of time that elapses between bits of data.
When using this field, make sure that Inactivity time is disabled or set to a larger value.
Otherwise the connection may be closed before the data in the buffer can be transmitted.
0: If serial data is not received, the NPort will wait indefinitely for additional data.
1 to 65535: If serial data is not received for the specified amount of time, the data that is
currently in the buffer will be packed for network transmission. The optimal force transmit
time 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 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
8.3 ms, so the force transmit time to be larger than 8.3 ms.
Settings for RFC2217 Mode
When Operation Mode is set to RFC2217 on a serial port’s Operation Modes page, you will be able to
configure additional settings, including TCP alive check time, TCP port, Packet length, Delimiter 1,
Delimiter 2, Delimiter process, and Force transmit.
TCP alive check time
Default 7 min
Options 0 to 99 min
Description This field specifies how long the NPort will wait for a response to “keep-alive” packets
before closing the TCP connection. The NPort checks connection status by sending periodic
“keep-alive” packets.
0: The TCP connection will remain open even if there is no response to the “keep-alive”
packets.
1 to 99: If the remote host does not respond to the packet within the specified time, the
NPort will force the existing TCP connection to close.