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Appendix A: Troubleshooting
Figure A-4. Calculated data rate.
• You can continue testing this port with different configurations or proceed with
testing other ports, if necessary.
If these steps do not solve your problem, contact Black Box Technical Support at
724-746-5500 or info@blackbox.com.
A.2 Contacting Black Box
If you determine that your USB to 4-Port RS-232/422/485 Interface Converter is
malfunctioning, do not attempt to alter or repair the unit. It contains no
user-serviceable parts. Contact Black Box Technical Support at 724-746-5500
or info@blackbox.com.
Before you do, make a record of the history of the problem. We will be able to
provide more efficient and accurate assistance if you have a complete description,
including:
• the nature and duration of the problem.
• when the problem occurs.
• the components involved in the problem.
• any particular application that, when used, appears to create the problem or
make it worse.