NPort IA5150/5250 Series User’s Manual
Web Console Configuration
5-13
Max connection
Setting
Factory Default
Necessity
1, 2, 3, 4
1
Required
Max connection
is usually used when the user needs to receive data from different hosts
simultaneously. The factory default is 1. In this case, only one specific host can access this port of
the NPort IA5150/5250, and the Real COM driver on that host will have full control over the port.
Max. Connection 1:
Allows only 1 host’s Real COM driver to open the specific NPort IA5150/5250 serial port.
Max Connection 2 to 4:
Allows 2 to 4 host’s Real COM drivers to open the specific NPort IA5150/5250 serial port, at the
same time. When multiple hosts’ Real COM drivers open the serial port at the same time, the
COM driver only provides a pure data tunnel without control ability. That is, this serial port
parameter will use firmware’s settings, not depend on your application program (AP).
Application software that is based on the COM driver will receive a driver response of “success”
when the software uses any of the Win32 API functions. The firmware will only send the data
back to the driver on the host.
Data will be sent first-in-first-out when data comes into the NPort from the Ethernet interface.
ATTENTION
When Max connection is set to 2, 3, or 4, this means that NPort IA5150/5250 will be using a
“multi connection application” (i.e., 2, 3, or 4 hosts are allowed access to the port at the same
time). When using a multi connection application, NPort IA5150/5250 will use the serial
communication parameters set in the console. All of the hosts connected to that port must use the
same serial settings. If one of the hosts opens the COM port with parameters that are different
from NPort IA5150/5250’s console setting, data communication may not work properly.
Ignore jammed IP
Setting
Factory Default
Necessity
No or Yes
No
Optional
Previously, when Max connections > 1, and the serial device is transmitting data, if any one of the
connected hosts is not responding, it will wait until the data has been transmitted successfully
before transmitting the second group of data to all hosts. Currently, if you select Yes for “Ignore
jammed IP,” the host that is not responding will be ignored, but the data will still be transmitted to
the other hosts.
Allow driver control
Setting
Factory Default
Necessity
No or Yes
No
Optional
If “max connection” is greater than 1, NPort will ignore driver control commands from all
connected hosts. However, if you set “Allow driver control” to YES, control commands will be
accepted. Note that since NPort IA may get configuration changes from multiple hosts, the most
recent command received will take precedence.
