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drukuj komentujTani optoizolator dla RS232

Tani optoizolator dla RS232


Izolator może zapewnić izolację elektryczną pomiędzy komputerem i wyposażeniem dołączonym do jego portu szeregowego.

Złącze K1 jest łączone z portem szeregowym komputera PC i pobiera z jego linii, tutaj linii TxD, symetryczne napięcie zasilania. Można również wykorzystać linię DTR i RTS, przy założeniu, ze będą regularnie przełączane od napięcia dodatniego do ujemnego.

Druga strona izolatora przenosi sygnały TTL Strona ta jest zasilana niskim napięciem. Ponieważ większość układów z mikrokontrolerami ma własne zasilanie, zasilenie kilku bramek więcej nie nastręcza żadnych trudności.

Napięcie na linii TxD jest zamieniane na symetryczne napięcie stale 6,8V przez D5 i D6. Napięcie to słży do zasilania IC1.

Sygnał TxD jest również doprowadzony do diody LED w IC2. Dioda D7 zapobiega uszkodzeniu diody LED ujemnym napięciem wejściowym.

Dioda LED optoizolatora będzie migotać w rytm doprowadzonych danych, natomiast kod cyfrowy pojawi się na jego wyprowadzeniu 6 układu IC2.

Bufory IC3b i IC3c wzmacniają sygnał cyfrowy do pełnych poziomów TTL Sygnał wysyłany przez mikrokontroler jest podawany do optoizolatora IC1 poprzez IC3a i, po przemianie optycznej, pojawia się również na wyprowadzeniu 6 IC1. Tutaj jest przełączany pomiędzy 6,8V, czyli w zakresie dostatecznie dużym do wysterowania standardowego łącza RS232.
schemat ideowy schemat ideowy
Schemat opublikowany za zgodą wydawnictwa AVT
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#11 | beisjb dnia 21.07.2017 11:05:36
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