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The tx led of arduino uno is always on and the board can't be programmed(programmer not responding) - IDE 1.x - Arduino Forum
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CQRobot DMX Shield MAX485 Chipset Compatible with Arduino Board (RDM Capable), Device Into DMX512 Network, LED/Music Remote Device Management Capable, Extended DMX Master. : Amazon.fr: Informatique
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Computer doesn't recognize Arduino (PWR/L/TX/RX indicator lights are all on) - Project Guidance - Arduino Forum
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Arduino UNO etc : Configurer une sortie, connecter une LED, l'allumer, la faire clignoter… - YouTube
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