{"id":2695,"date":"2017-08-22T16:39:22","date_gmt":"2017-08-22T14:39:22","guid":{"rendered":"https:\/\/digitalyacht.fr\/blog\/?p=2695"},"modified":"2017-11-27T14:36:25","modified_gmt":"2017-11-27T13:36:25","slug":"voltage-nmea","status":"publish","type":"post","link":"https:\/\/digitalyacht.fr\/blog\/2017\/08\/voltage-nmea\/","title":{"rendered":"\u00cates-vous positive ou n\u00e9gative ?"},"content":{"rendered":"

\"\"<\/p>\n

Un client nous a r\u00e9cemment contact\u00e9 afin de comprendre pourquoi il mesurait un voltage n\u00e9gative sur sa sortie NMEA0183 d\u2019un transpondeur AIS. Il a confirm\u00e9 qu\u2019il avait mis le fil rouge de son multim\u00e8tre sur la sortie + du fil NMEA et le fil noir sur la sortie – du NMEA, donc comment a-t-il pu mesurer un voltage n\u00e9gatif \u00e0 part si l\u2019AIS \u00e9tait d\u00e9fectueux.<\/p>\n

Normalement, quand vous mesurez par exemple le voltage d\u2019une batterie, les deux terminaux sont clairement \u00e9tiquet\u00e9 + et – donc apr\u00e8s avoir suivi les branchements, le multim\u00e8tre devrait toujours afficher un voltage positif. Cependant, avec la plupart des signaux NMEA0183, il y a un \u00ab\u00a0diff\u00e9rent\u00a0\u00bb voltage o\u00f9 la connexion positive et n\u00e9gative ont tous les deux des signaux et c\u2019est la diff\u00e9rence entre ces deux connexions que vous \u00eates en train de mesurer.<\/p>\n

En regardant le diagramme ci-dessus, vous pouvez voir que le signal varie entre 0V et +3,3V pour les deux connexions, mais ces signaux sont invers\u00e9s donc quand un signal est \u00e0 3,3V alors l\u2019autre signal va \u00e0 0V et vice-versa. Cela \u00e0 l’effet int\u00e9ressant de faire alterner les tensions mesur\u00e9es.<\/p>\n

La plupart des unit\u00e9s AIS, plus particuli\u00e8rement les r\u00e9cepteurs sortent uniquement les donn\u00e9es quand ils re\u00e7oivent des cibles AIS. Donc s\u2019il n\u2019y a pas de bateaux avec un syst\u00e8me AIS \u00e0 bord dans la zone, ce n\u2019est pas rare de mesurer un voltage n\u00e9gatif \u00e0 -3,3V sur la sortie de l\u2019AIS. En additionnant ceci avec le fait que les donn\u00e9es AIS sont \u00e0 une vitesse rapide (38400 bauds), alors les impulsions sont plus courtes et peuvent ne pas \u00eatre d\u00e9tect\u00e9es par le multim\u00e8tre. C\u2019est toujours utile d\u2019utiliser une Led pour essayer les sorties NMEA0183 et vous pouvez t\u00e9l\u00e9charger une note technique sur ce proc\u00e9d\u00e9 en cliquant ici.<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"Un client nous a r\u00e9cemment contact\u00e9 afin de comprendre pourquoi il mesurait un voltage n\u00e9gative sur sa sortie…\n","protected":false},"author":2,"featured_media":2696,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":37,"csco_singular_sidebar":"","csco_page_header_type":"","csco_appearance_masonry":"","csco_page_load_nextpost":"","csco_post_subtitle":"","csco_post_video_location":[],"csco_post_video_location_hash":"","csco_post_video_url":"","csco_post_video_bg_start_time":0,"csco_post_video_bg_end_time":0,"footnotes":""},"categories":[2,278],"tags":[169,264],"class_list":{"0":"post-2695","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-news","8":"category-techniques","9":"tag-nmea","10":"tag-voltage","11":"cs-entry","12":"cs-video-wrap"},"yoast_head":"\n\u00cates-vous positive ou n\u00e9gative ? 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