User's Manual

NPort W2150A/W2250A Series Web Console: Serial Port Settings
8-20
Settings for Ethernet Modem Mode
When Application is set to Ethernet Modem Mode, the NPort will accept AT commands such as “ATD
192.127.168.1:4001” from the serial port. A TCP connection will then be requested from the specified
remote Ethernet Modem or PC. When the remote unit accepts this TCP connection, the NPort will return the
“CONNECT {baudrate}” signal to the serial port and will then enter data mode. Please refer to Appendix C
for details on Ethernet modem commands.
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.
TCP port
Default 4001
Options
Description This field specifies the TCP port to use for communication with the attached serial device.