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Build your own RS232 adapter with LED indicators – Do It Easy With ScienceProg
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transistors - Detect RS232 lines activity - Electrical Engineering Stack Exchange
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![LED Moving Message Display 362x72mm [1113] : Sunrom Electronics](https://www.sunrom.com/media/content/154/rs232.gif "LED Moving Message Display 362x72mm [1113] : Sunrom Electronics")