Technical FAQs

Question	I can ping and telnet the NPort , but why can't I open the tty port even after installing the npreal driver under Linux?
Question Type	Application
Updated	Aug 18,2005
Hits	4541
Products	NPort Express DE-211, NPort Express DE-311, NPort Server Lite DE-301/302/304/331/332/334, , NPort DE-311M

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[Description]

I have downloaded and installed npbc.tgz from your site. When starting the system, mxloadsvr creates a node for /dev/ttyr00. However I cannot execute an stty -a < /dev/ttyr00 on the device. The command hangs until I press ctrl C. The npreal2d.log gives the following :

07-14-2005 22:34:12 MOXA real TTY daemon program starting (Ver1.10 (4/22/2005))...
07-14-2005 22:34:12 Socket connect fail (201.1.1.122,TCP port 950) !

I can ping the de-311 and telnet to it.

[Possibilities]

One possibility is that the IP address of the PC was not in the access control table of the NPort. This could be the case if you’ve installed the NPort in any other Windows system.

Normally, the NPort window driver will add the IP address of host PC into the access control table automatically while you install it. Since then, only the PC with IP address in this table can access the NPort. However, if you move the NPort to another PC running Linux, the Linux driver will not follow the same procedure as the Windows driver, so the new PC still cannot access the NPort.

[Solution]

The solution is to use the Configurator in the Windows system to add the IP address of the new PC, or clear all IP addresses in the access control table of NPort. Then, the new PC running Linux will be able open the tty port.

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