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© Sealevel Systems, Inc. 2104 Manual | SL9092 9/2021
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
485I
is configured properly, the USB Enabled LED (EN) will be lit.
This should allow you to use S
ealevel’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
485I
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
485I
is ready for use in your application.
5.
Please note that if the card 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 adapter in RS-422 mode first.
Then configure the adapter for your application.
