User's Manual

NPort W2150A/W2250A Series Web Console: Serial Port Settings
8-5
Max connection
Default 1
Options 1 to 8
Description This field specifies the maximum number of connections that will be accepted by the serial
port.
1: Only one specific host can access this serial port, and the Real COM driver on that host
will have full control over the port.
2 to 8: This serial port will allow the specified number of connections to be opened
simultaneously. With simultaneous connections, the Real COM driver will only provide a
pure data tunnel with no control ability. The serial communication will be determined by
the NPort rather than by your application program. Application software that is based on
the Real COM driver will receive a driver response of “success” when using any of the
Win32 API functions. The NPort will send data only to the Real COM driver on the host.
Data received from hosts will be sent to the attached serial device on a first-in-first-out
basis.
ATTENTION
When Max connection is two or greater, the serial port’s communication settings (i.e., baudrate, parity, data
bits, etc.) will be determined by the NPort. Any host that opens the COM port connection must use identical
serial communication settings.
Ignore jammed IP
Default Disable
Options Disable, Enable
Description This field specifies how an unresponsive IP address is handled when there are
simultaneous connections to the serial port.
Disable: All transmission will be suspended if one IP address becomes unresponsive.
Transmission will only resume when all hosts have responded.
Enable: Data transmission to the other hosts will not be suspended if one IP address
becomes unresponsive.
Allow driver control
Default Disable
Options Disable, Enable
Description This field specifies how the port will proceed if driver control commands are received from
multiple hosts that are connected to the port.
Disable: Driver control commands will be ignored.
Enable: Control commands will be accepted, with the most recent command received
taking precedence.
Connection goes down
Default always high
Options always low, always high
Description This field specifies what happens to the RTS and DTR signals when the Ethernet
connection goes down. For some applications, serial devices need to know the Ethernet
link status through RTS or DTR signals sent through the serial port.
Always low: The selected signal will change to low when the Ethernet connection goes
down.
Always high The selected signal will remain high when the Ethernet connection goes down.