Instruction Manual

Appendix A – Troubleshooting
Sealevel Systems SeaLINK+232 Page 5
Appendix A - Troubleshooting
Serial Utility test software is supplied with the Sealevel Systems adapter and will be used in the troubleshooting
procedures. Using this software and following these simple steps, most common problems can be eliminated
without the need to call Technical Support.
1. If your adapter isn’t working, first check to make sure that USB support is enabled in the System BIOS and it is
functioning properly in the operating system. This can be done by using either the Windows 98/ME or
Windows 2000 Device Manager.
2. Ensure that the Sealevel Systems software has been installed on the machine so that the necessary files are in
place to complete the installation.
3. When the SeaLINK+232 is configured properly, the USB Enabled LED (EN) will be lit. This should allow you
to use Sealevel’s WinSSD utility and the supplied loopback plug to check communications. The supplied
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 within WinSSD. Contact Sealevel Systems if you
need further assistance
4. When testing the SeaLINK+232 in loopback mode, you should see both the TD and RD LED’s flashing as
well as seeing echoed data on the screen. The loopback test first transmits a HEX pattern, 55AA, and then an
ASCII string of data. If this test passes, then the SeaLINK+232 is ready for use in your application.