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.

4-1

DE-302/304/332/334, DE-301/331 specifications

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