NPort 5600 Series User’s Manual | Configuring NPort Administrator | |||
| Max connection |
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| Setting | Factory Default | Necessity |
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| 1, 2, 3, 4 | 1 | Required |
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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
Ignore jammed IP
Setting | Factory Default | Necessity |
No or Yes | No | Required |
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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 |
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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.
