User's Manual

NPort W2150A/W2250A Series Web Console: Serial Port Settings
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When Operation Mode is set to Pair Connection Master or Pair Connection Slave on a serial port’s
Operation Modes page, you will be able to configure additional settings such as TCP alive check time,
Destination address and TCP port. A Pair Connection application involves one serial port communicating
over an IP network to another serial port as if the two serial ports were connected by a serial cable. Pair
Connection modes can be used to extend RS-232 transmission to unlimited distances.
An NPort device server is needed at both ends of the connection. The serial port at one end must be set to
Pair Connection Master mode, and the serial port at the other end must be set to Pair Connection Slave
mode. It does not matter which serial port is master and which serial port is slave.
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.
Destination address
Default
Options IP address and port (e.g., “192.168.1.1” and “4001”)
Description This field specifies the IP address for the NPort at the opposite end of the Pair Connection,
and the TCP port number for communication with the serial port. The port number must
match with that serial port’s TCP port setting.
TCP port
Default 4001
Options
Description This field specifies the TCP port to use for communication with the attached serial device.
The serial port at the opposite end of the Pair Connection must use this port number to
establish the connection.