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4 Troubleshooting
This chapter explains how to solve some problems you could encounter while
using NPort Server Lite. If you still have problems after reading this chapter,
contact your dealer, or e-mail Moxa for help. You may also use the "Problem
Report Form" at the end of this manual to notify your dealer that you require
prompt technical support.
We cover the following topics.
❑ Installation and Configuration Troubleshooting
❑ Programming Problems
Installation and Configuration
Troubleshooting
A particular host PC is used to install an NPort Server Lite device server in
Single Host mode, but after working successfully for an extended period of
time, the same host PC is unable to access the NPort Server Lite device
server.
When a host PC is used to install an NPort Server Lite device server in
Single Host mode, two things happen: (1) NPort Server Lite’s Single Host
Mode driver is installed on the host PC, and (2) the host PC’s IP address is
automatically entered into NPort Sever Lite’s access control table. For
security reasons, and to simplify operation, Single-Host Mode allows only
one host IP to be entered into its access control table. Furthermore, the only
way to change the access control IP address is to reinstall the driver. The
important point is that this reinstallation can be done by either the original
host, or a different host. If a different host installs the same NPort Server
Lite device server in Single Host mode, then the original host will no longer
be able to access the device server’s serial port.