User`s manual

NPort S8000 Series Basic Settings and Device Server Configuration
5-15
Max connection
Setting Factory Default Necessity
1, 2, 3, 4, 5, 6, 7, 8 1 Required
This field is used if you need to receive data from different hosts simultaneously. When set to 1, only one
specific host can access this port of the NPort S8000, and the Real COM driver on that host will have full control
over the port. When set to 2 or greater, up to the specified number of hosts’ Real COM drivers may open this
port at the same time. When multiple hosts’ Real COM drivers open the port at the same time, the COM driver
only provides a pure data tunnel—no control ability. The serial port parameters will use firmware settings
instead of depending 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 data back to the driver on the host.
Data will be sent first-in-first-out when data enters the NPort S8000 from the Ethernet interface.
ATTENTION
When Max connection is
set to 2 to 8, this means that the NPort will be using a “multi connection application
”
(i.e., 2
to 8 hosts are allowed access
to the port at the same time). When using a multi connection application,
the
NPort 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 the NPort’s console setting, data communication may not work properly.
Ignore jammed IP
Setting Factory Default Necessity
Enable or Disable Disable Optional
Previously, if “max connection” was greater than 1, the serial device was transmitting data, and a connected
host was not responding, the NPort would wait until the data was transmitted successfully before transmitting
the second group of data to all hosts. Currently, if you select Enable 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
Enable or Disable Disable Optional
If “max connection” is greater than 1, the 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 the NPort
S8000 may get configuration changes from multiple hosts, the most recent command received will take
precedence.
Connection goes down
Setting Factory Default Necessity
Always High or Always
Low
Always High Optional
You can configure 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. Use always low if you want the RTS and DTR signal to change their state to low when
the Ethernet connection goes down. Use always high if you do not want the Ethernet connection status to
affect the RTS or DTR signals.
Data Packing
Packet length
Setting Factory Default Necessity
0 to 1024 0 Optional