Convertiseur USB/RS232

Submitted by admin on Wed, 08/20/2008 - 00:51

Réf.Technique

Ce circuit convertit simplement un signal USB à un signal RS232 et vice-versa. Une LED indique la réception, l'autre l'émission et celle du haut indique l'alimentation.

J'ai utilisé le schéma tiré de la page 29 du document de spécification du FTDI ( p29 7.4 USB to MCU UART Interface ) et du schéma du Arduino ( pour le reset automatique du Diecimila ).

http://www.ftdichip.com/Documents/DataSheets/DS_FT232R.pdf
http://www.arduino.cc/en/uploads/Main/Arduino-Diecimila-schematic.pdf

Une switch à souder sert à choisir l'alimentation d'entrée.

J'ai programmé le EEPROM interne du FTDI avec ce programme;
http://www.ftdichip.com/Resources/Utilities.htm#MProg

J'ai utilisé ces paramètres-là ( celle du arduino NG );
http://www.arduino.cc/playground/uploads/Main/default_FT232RL_Arduino_NG...

Voici la correspondance des "pinout"

Attachment	Size
uslabusb.brd	20.55 KB
uslabusb.sch	136.44 KB

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