Hello, I try to use my Arduino UNO to send control data to a central heating unit. I can communicate with this unit via a maintenance programm (Window XP) obtained from the manufacturer. This communication is standard Serial 9600 baud which I can observe by means of a serial port sniffer (Device Mo…

Open serial port problem

Seniorvos May 16, 2014, 7:37am 13

Surpise! Yesterday night I replaced the MAX232A with a brand new one. This solved my problem. It appeared to be no Arduino problem at all.
Thanks for the support!

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Open serial port problem

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