DUAL- AND QUAD-PORT USB HUBS
Appendix A. Troubleshooting
A.1 Troubleshooting Tips
Serial Utility test software is supplied on the included CD-ROM and will be used in the troubleshooting procedures. By using this software and following these simple steps, you can eliminate most common problems without calling Technical Support.
1.If your Hub isn’t working, first check to make sure that USB support is enabled in the System BIOS and that it’s functioning properly in the operating system. Use either the Windows 98/Me or Windows 2000 Device Manager to do this.
2.Make sure that the included software (from the CD-ROM) has been installed on the machine and that the necessary files are in place to complete the installation.
3.When the USB Hub is configured properly, the USB Enabled LED (E) will be lit. This should allow you to use the WinSSD utility (from the CD-ROM ) and a loopback plug (not included) to check communications. The loopback plug connects TD to RD. If you decide to test the modem control signals, a full-pin loopback plug will be required. Details on loopback plugs are included on WinSSD. (A loopback plug is available by special order from Black Box. Call Technical Support for details.)
4.When testing the USB Hub in loopback mode, the port LEDs will flash and echoed data will appear on the screen. The loopback test first transmits a hex pattern, 55AA, and then a ASCII string of data. If this test passes, then the USB Hub is ready for use in your application.
5.Please note that if the USB Hub is configured for 2-wire RS-485 with no echo, a loopback test is not possible. The receiver, in this case, will be turned off and the test will fail. If you plan on using this device in two-wire mode, test the Hub in RS-422 mode first. Then configure the Hub for your application.
