04-04-2015, 20:40
(04-04-2015, 20:24)hvalentim Wrote: What I mean is: if I apply a multimeter I see the voltage supplied to the led shifting consistent with on-off blinking behavior. Voltage when powered from USB is OK, something like 2,65 volts. When Powered from 12v I see around 6v.
If you see this, and the TX LED is not blinking, maybe it is reversed!
Led anode (big leg) will connect to the pin closer to the edge of the board.
For normal operation, or any test, TX board must be powered from 12V. Don't consider any measure done when it is just powered from the 5V USB.
As an additional info, the LEDS are powered from the 9V rail. They may not blink when the board is powered only by 5V from USB