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Are cineva vreo sugestie de ce nu ar merge interfata seriala la un multimetru MS8050? Am incercat cu ambele aplicatii de pe site-ul producatorului dar se pare ca multimetrul nu trimite nimic dupa ce activez RS232. Am verificat inclusiv cu osciloscopul ...

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In lipsa de alte idei m-am apucat sa desfac multimetrul. Si cu ocazia asta m-am autoluminat. Se pare ca interfata seriala este izolata si necesita alimentare externa cel putin  pe pinul DTR de la conectorul DB9. Mufa alba vine de la conectorul serial. Am verificat cu osciloscopul si la intrarea optocuplorului acela negru se pare ca este un semnal.  Mai ramane sa vad ce fac cei 3 tranzistori si cum sa ii alimentez corect.




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