Moxa Technologies NPort 5600 - Manual (Page 42)

NPort 5600 Series User’s Manual Configuring NPort Administrator
5-12
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, and the Real COM driver on that host will have full control over the port.
Max. connection 1:
Allows only a single host’s Real COM driver to open the specific NPort serial port.
Max connection 2 to 4:
Allows 2 to 4 hosts’ Real COM drivers to open the specific NPort 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.
Ignore jammed IP
Setting Factory Default Necessity
No or Yes No Required
For previous versions of NPort 5200, when Max connections > 1, and the serial device is
transmitting data, if any one of the connected hosts was not responding NPort 5200 would wait
until the data had been transmitted successfully before transmitting the second group of data to all
hosts. For the current version of NPort 5200, 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 Required
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 5200 may get configuration changes from multiple hosts, the most
recent command received will take precedence.
ATTENTION
When Max connection is set to 2, 3, or 4, this means that NPort 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 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’s console setting, data
communication may not work properly.