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Evaluation Board Controller
Table IV. Troubleshooting guide
Symptom
LED Not Flashing
No Communication between
PC and Evaluation Board.
Programs Timeout
Possible Cause
No power is applied to the evaluation board. The evaluation board requires a 12V
AC supply.
There are a number of possible causes for a communications failure. These are listed
below.
1. Cable not connected or incorrect cable type. The cable should be a fully-populated
Centronics printer port cable.
2. Incorrect printer port. The evaluation board requires that the printer port has bi-
directional capability. Acceptable types are PS/2, EPP and ECP.
3. Correct Printer Port but bidirectional capability not enabled. It is possible that a
bidirectional printer port can be set to be unidirectional mode in the PC BIOS.
The user should consult the PC manual for instructions on examining the BIOS
4. Incorrect Printer Port Address. There are three possible addresses for a printer
ports and the one fitted to a users PC may not be the same as the default address.
This can be changed using the Printer Port menu item.
The evaluation board being used with the Evaluation Board Controller may have the
links incorrectly set.
–8–
REV. A
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