NUE- USB Card Manual, ver 1.33c
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Copyright 2008, Midnight Design Solutions, LLC
APPENDIX D: Engineering Change History
Several pc board changes are recommended to ensure consistently satisfactory operation of your USB
card. Chances are that if you received an assembled and tested USB card (or factory upgrade), you do
not need to perform these modifications ... but if you are occasionally experiencing some unusual
behavior with the USB card, you could benefit from making these changes. They are easy to do and will
ensure that you have the best hardware for successful use.
Using the photo below, make these changes to your USB card ...
1)
Add jumper wire from CN1 pin 4 to the adjacent ground pad;
2)
Add a 1K-ohm pull-up resistor to the TxD and RxD pins of the female connector;
3)
Ensure that a shunt (jumper) is installed on pins 4-5 of the 8-position pinheader.
Bottom view of the USB card showing modifications to be made
(Click photo for a larger view)
