{"id":2312,"date":"2025-04-22T15:50:06","date_gmt":"2025-04-22T13:50:06","guid":{"rendered":"https:\/\/stage-lettel.fk-agency.net\/?post_type=ressources&#038;p=2312"},"modified":"2025-10-15T10:58:52","modified_gmt":"2025-10-15T08:58:52","slug":"communication-modbus","status":"publish","type":"ressources","link":"https:\/\/stage-lettel.fk-agency.net\/fr\/ressources\/communication-modbus\/","title":{"rendered":"La communication RS485 Modbus"},"content":{"rendered":"\r\n\r\n<section class=\"blc-heroSingle\">\r\n\r\n\t<div class=\"container\">\r\n\t\t<div class=\"row gy-5\">\r\n\r\n\t\t\t<div class=\"col-xl-4 col-lg-6\">\r\n\t\t\t\t<div class=\"blc-heroSingle_txt\">\r\n\t\t\t\t\t<span class=\"blc-heroSingle_supttl\">Publi\u00e9 le 22 avril 2025<\/span>\r\n\t\t\t\t\t<h1 class='blc-heroSingle_ttl' class='blc-heroSingle_ttl' id=\"la-communication-rs485-modbus\">La communication RS485 Modbus<\/h1>\r\n\t\t\t\t\t<p class=\"blc-heroSingle_data\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"blc-heroSingle_tags\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t\t\t\t\t\t\t<\/p>\r\n\t\t\t\t<\/div>\r\n\t\t\t<\/div>\r\n\t\t\t\r\n\t\t\t<div class=\"col-xl-7 col-lg-5 offset-lg-1\">\r\n\t\t\t\t<figure class=\"heroSingle_med media-wrp__16x9 full\">\r\n\t\t\t\t\t<img decoding=\"async\" alt=\"Communication Modbus\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/Modbus-communication.jpg\" srcset=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/Modbus-communication-300x205.jpg 300w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/Modbus-communication-1024x701.jpg 1024w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/Modbus-communication-768x526.jpg 768w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/Modbus-communication-600x411.jpg 600w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/Modbus-communication.jpg 1249w\" sizes=\"(min-width: 992px) 893px, (min-width: 1200px) 1080px, (min-width: 1400px) 1260px, (min-width: 1600px) 1440px, 100vw\">\t\t\t\t\t\t\t\t\t<\/figure>\r\n\t\t\t<\/div>\r\n\r\n\t\t<\/div>\r\n\t<\/div>\r\n<\/section>\r\n\r\n\n\n\r\n\r\n<section class=\"blc-content-post spc-s5 bg-cw \"> \r\n    <div class=\"container\">\r\n\r\n        <div class=\"row\">\r\n            <div class=\"col-lg-8\">\r\n                <div class=\"editor\">\r\n                    <h2 id=\"presentation\">Pr\u00e9sentation<\/h2>\n<div class=\"container p-0\">\n<div class=\"row\">\n<div class=\"col-md-7 col-12\">\n      Le Modbus est le protocole de communication industriel le plus couramment utilis\u00e9.<\/p>\n<p><strong> Il permet la communication entre plusieurs \u00e9quipements connect\u00e9s sur un m\u00eame r\u00e9seau.<\/strong> Par exemple la remont\u00e9e d\u2019informations de compteurs d\u2019\u00e9nergie \u00e9lectrique sur un ordinateur.<\/p>\n<p>Ses avantages sont la <strong>flexibilit\u00e9<\/strong> et la <strong>simplicit\u00e9<\/strong> de mise en \u0153uvre.\n    <\/div>\n<div class=\"col-md-4 col-12 offset-lg-1 p-3\"><img decoding=\"async\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/modbus-vignette.jpg\" alt=\"Modbus\" \/>\n    <\/div>\n<\/p>\n<\/div>\n<\/div>\n<h2 id=\"les-differents-protocoles-modbus\">Les diff\u00e9rents protocoles Modbus<\/h2>\n<h3 id=\"le-modbus-rtu\">Le Modbus RTU<\/h3>\n<p>Gr\u00e2ce \u00e0 sa <strong>fiabilit\u00e9<\/strong> et sa <strong>simplicit\u00e9 d&rsquo;utilisation<\/strong>, le Modbus protocole RTU est le plus courant pour le d\u00e9ploiement d&rsquo;un r\u00e9seau en local. Il fonctionne sur le mode d&rsquo;une communication entre un appareil <strong>Ma\u00eetre et des esclaves<\/strong>.<\/p>\n<p>L&rsquo;\u00e9quipement Ma\u00eetre adresse <strong>une requ\u00eate<\/strong> \u00e0 un appareil esclave identifi\u00e9 par une adresse sp\u00e9cifique, qui lui adressera la<strong> r\u00e9ponse sollicit\u00e9e<\/strong>. La requ\u00eate peut \u00eatre une commande (\u00e9criture) ou une interrogation (lecture).<\/p>\n<p style=\"padding: 40px; background-color: #efefef; border-radius: 10px;\">La trame du Modbus RTU est constitu\u00e9e d&rsquo;une suite de caract\u00e8res <strong>hexad\u00e9cimaux<\/strong> et contient les informations du sch\u00e9ma suivant. Chaque octet composant une <strong>trame RTU<\/strong> est cod\u00e9 sur 2 caract\u00e8res hexad\u00e9cimaux (2 fois 4 bits) La taille maximale des donn\u00e9es est de 256 octets.<\/p>\n<p><img decoding=\"async\" class=\"wp-image-2324 size-full aligncenter\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/mdobus_schema_1.jpg\" alt=\"\" width=\"1122\" height=\"362\" srcset=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/mdobus_schema_1.jpg 1122w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/mdobus_schema_1-600x194.jpg 600w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/mdobus_schema_1-300x97.jpg 300w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/mdobus_schema_1-1024x330.jpg 1024w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/mdobus_schema_1-768x248.jpg 768w\" sizes=\"(max-width: 1122px) 100vw, 1122px\" \/><\/p>\n<div style=\"padding: 40px; background-color: #efefef; border-radius: 10px; margin-top: 3rem;\">\n<p><strong><span style=\"color: #1b1945;\">Exemple d&rsquo;interrogation de la tension instantan\u00e9e mesur\u00e9e par un compteur \u00e9lectrique Modbus MCT2-163M :<\/span><\/strong><\/p>\n<ul>\n<li>Adresse Modbus du compteur : 01<\/li>\n<li>Code fonction lecture : 03<\/li>\n<li>Adresse registre Tension : 0000<\/li>\n<\/ul>\n<p><strong><span style=\"color: #1b1945;\">La requ\u00eate prendra la forme suivante :<\/span><\/strong><br \/>\n<img decoding=\"async\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/requete-modbus.jpg\" alt=\"requete-modbus\" \/><\/p>\n<p><strong><span style=\"color: #1b1945;\">Et la r\u00e9ponse transmise par le compteur :<\/span><br \/>\n<img decoding=\"async\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/reponse-modbus.jpg\" alt=\"reponse-modbus\" \/><\/strong><\/p>\n<p>La valeur hexad\u00e9cimale <strong><span style=\"color: #1b1945;\">436A999A <\/span><\/strong>correspond \u00e0 <strong><span style=\"color: #1b1945;\">234,6V<\/span><\/strong>.<\/p>\n<\/div>\n<h3 id=\"cablage-et-bus-rs485\">C\u00e2blage et bus RS485<\/h3>\n<p>La liaison&nbsp;<strong>RS485<\/strong>&nbsp;est la plus utilis\u00e9e car elle permet d\u2019interroger&nbsp;<strong>32 \u00e9quipements<\/strong>&nbsp;esclaves sur une&nbsp;<strong>distance maximale de 1200m<\/strong>.<\/p>\n<p>Au-del\u00e0 de cette distance ou de ce nombre d\u2019\u00e9quipements, il est n\u00e9cessaire d\u2019installer un <strong>r\u00e9p\u00e9teur.<\/strong> Chaque r\u00e9p\u00e9teur permet d\u2019ajouter un nouveau segment de 32 \u00e9quipements, dans la limite d\u2019un maximum de <strong data-start=\"628\" data-end=\"673\">247 \u00e9quipements adressables par un ma\u00eetre<\/strong>.<\/p>\n<p>Le c\u00e2blage s\u2019effectue en liaison 2 fils et les 2 extr\u00e9mit\u00e9s du bus RS485 doivent \u00eatre termin\u00e9es \u00e0 l\u2019aide de r\u00e9sistance de <strong>120 ohms<\/strong> (<strong>r\u00e9sistances de terminaison<\/strong>). Cette terminaison permet d\u2019\u00e9liminer les r\u00e9flexions de signal et d\u2019am\u00e9liorer la stabilit\u00e9 ainsi que la fiabilit\u00e9 de la communication.<br \/>\n<img decoding=\"async\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/Com_Modbus_Illustration_01.jpg\" alt=\"sch\u00e9ma liaison RS485\" \/><\/p>\n<h3 id=\"resistance-aux-interferences-electromagnetiques\">R\u00e9sistance aux interf\u00e9rences \u00e9lectromagn\u00e9tiques<\/h3>\n<p>Pour am\u00e9liorer la r\u00e9sistance du RS485 aux interf\u00e9rences \u00e9lectromagn\u00e9tiques (<strong>EMI<\/strong>), il est essentiel de raccorder correctement la <strong>ligne de terre<\/strong> et d\u2019utiliser des <strong>c\u00e2bles blind\u00e9s<\/strong>.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/raccordement-ligne-terre.jpg\" alt=\"sch\u00e9ma liaison RS485\" \/><\/p>\n<p>Cette m\u00e9thode pr\u00e9sente un inconv\u00e9nient : le potentiel de terre des dispositifs esclaves peut diff\u00e9rer de celui du dispositif ma\u00eetre en raison de facteurs tels que <strong>la longueur des c\u00e2bles, le bruit \u00e9lectrique, les interf\u00e9rences ou les diff\u00e9rences de source d&rsquo;alimentation, etc<\/strong>.<\/p>\n<p>Cela peut entra\u00eener un <strong>d\u00e9calage du signal<\/strong> \u00e0 l\u2019arriv\u00e9 du dispositif ma\u00eetre, provoquant des erreurs. Dans ce cas, il est recommand\u00e9 d&rsquo;essayer de <strong>d\u00e9connecter<\/strong> les lignes de terre.<\/p>\n<div class=\"container my-3\" style=\"background-color: #fdfdfd; border-radius: 10px;\">\n<div class=\"row g-3 \">\n<div class=\"col-12 col-md-5\">\n<div class=\"p-3\"><strong><span style=\"color: #1b1945;\">L&rsquo;utilisation de c\u00e2bles blind\u00e9s devient indispensable en pr\u00e9sence de fortes interf\u00e9rences \u00e9lectromagn\u00e9tiques sur le site.<\/span><\/strong><\/div>\n<\/div>\n<div class=\"col-12 col-md-7\">\n<div class=\"p-3\"><img decoding=\"async\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/Com_Modbus_Illustration_02.jpg\" alt=\"illustration de c\u00e2ble blind\u00e9\" \/><\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>Le blindage de diff\u00e9rents c\u00e2bles doit \u00eatre connect\u00e9 de mani\u00e8re continue, garantissant un <strong>contact permanent<\/strong>. Il est recommand\u00e9 de le relier \u00e0 la terre <strong>uniquement \u00e0 une extr\u00e9mit\u00e9 du c\u00e2ble<\/strong>.<\/p>\n<div class=\"container my-3\" style=\"background-color: #fdfdfd; border-radius: 10px;\">\n<div class=\"row g-3 \">\n<div class=\"col-12 col-md-5\">\n<div class=\"p-3\"><strong><span style=\"color: #1b1945;\">La m\u00e9thode id\u00e9ale consiste \u00e0 r\u00e9aliser une connexion 360\u00b0 autour du blindage, \u00e0 l\u2019aide d\u2019un collier de serrage m\u00e9tallique ou une bague de masse, mont\u00e9s sur une plaque mise \u00e0 la terre.<\/span><\/strong><\/div>\n<\/div>\n<div class=\"col-12 col-md-7\">\n<div class=\"p-3\"><img decoding=\"async\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/Com_Modbus_Illustration_03.jpg\" alt=\"extr\u00e9mit\u00e9 du c\u00e2ble avec mise \u00e0 la terre\" \/><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"padding: 20px; background-color: #efefef; border-radius: 10px; margin-top: 3rem;\"><strong><span style=\"color: #1b1945;\">Mise \u00e0 la terre du blindage reliant plusieurs appareils dans une boucle Modbus.<\/span><\/strong><\/div>\n<p><img decoding=\"async\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/Com_Modbus_Illustration_04.jpg\" alt=\"illustration mise \u00e0 la terre blindage boucle Modbus\" \/><\/p>\n<div style=\"padding: 20px; background-color: #efefef; border-radius: 10px; margin-top: 3rem;\"><strong><span style=\"color: #1b1945;\">Adopter le bon chemin de c\u00e2ble<\/span><\/strong><\/div>\n<div class=\"container mt-3\">\n<div class=\"row\">\n<div class=\"col-12 col-md-4 text-center\">\n<div class=\"p-3\"><strong>Performance CEM faible<\/strong><img decoding=\"async\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/blindage1.jpg\" alt=\"protection faible\" \/><\/div>\n<\/div>\n<div class=\"col-12 col-md-4 text-center\">\n<div class=\"p-3\"><strong>Performance CEM acceptable<\/strong><img decoding=\"async\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/blindage2.jpg\" alt=\"Protection moyenne\" \/><\/div>\n<\/div>\n<div class=\"col-12 col-md-4 text-center\">\n<div class=\"p-3\"><strong>Performance CEM optimale<\/strong><img decoding=\"async\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/blindage3.jpg\" alt=\"protection optimale\" \/><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"padding: 20px; background-color: #efefef; border-radius: 10px; margin-top: 3rem;\"><strong><span style=\"color: #1b1945;\">Plus la goulotte ou le conduit est ferm\u00e9 et profond, meilleur est l\u2019effet de protection contre les EMI.<\/span><\/strong><\/div>\n<div class=\"container mt-3\">\n<div class=\"row g-5\">\n<div class=\"col-12 col-md-6 text-center \">\n<div class=\"p-3\"><strong><span style=\"color: #e61e5a;\">Mauvaise Protection<\/span><\/strong><img decoding=\"async\" class=\"p-3\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/blindage4.jpg\" alt=\"mauvaise protection\" \/><\/div>\n<\/div>\n<div class=\"col-12 col-md-6 text-center \">\n<div class=\"p-3\"><strong><span style=\"color: #198754;\">Bonne protection<\/span><\/strong><img decoding=\"async\" class=\"p-3\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/blindage5.jpg\" alt=\"bonne protection\" \/><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div style=\"padding: 20px; background-color: #efefef; border-radius: 10px; margin-top: 3rem;\"><strong><span style=\"color: #1b1945;\">S\u00e9paration des conducteurs de puissance<\/span><\/strong><br \/>\nIl est indispensable de s\u00e9parer les c\u00e2bles de natures diff\u00e9rentes (puissance, signal, donn\u00e9es, etc.) dans un m\u00eame chemin.<\/div>\n<div class=\"container mt-3 g-5\">\n<div class=\"row align-items-stretch\">\n<div class=\"col-12 col-md-6 d-flex\">\n<div class=\"d-flex flex-column p-3 w-100\">\n<p><strong><span style=\"color: #e61e5a;\">Mauvais agencement des c\u00e2bles<\/span><\/strong><br \/>\nRisque de perturbations \u00e9lectromagn\u00e9tiques<\/p>\n<p><img decoding=\"async\" class=\"img-fluid mt-auto\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/blindage6.jpg\" alt=\"mauvais agencement des c\u00e2bles\" \/><\/p>\n<\/div>\n<\/div>\n<div class=\"col-12 col-md-6 d-flex\">\n<div class=\"d-flex flex-column p-3 w-100\">\n<p><strong><span style=\"color: #198754;\">S\u00e9paration ad\u00e9quate des conducteurs de puissance<\/span><\/strong><br \/>\nConforme aux bonnes pratiques CEM<\/p>\n<p><img decoding=\"async\" class=\"img-fluid mt-auto\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/blindage7.jpg\" alt=\"s\u00e9paration ad\u00e9quate des conducteurs de puissance\" \/><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"container mt-3 g-5\">\n<div class=\"row align-items-stretch\">\n<div class=\"col-12 col-md-6 d-flex\">\n<div class=\"d-flex flex-column px-3 text-center w-100\">\n<p><img decoding=\"async\" class=\"img-fluid mt-auto\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/blindage8.jpg\" alt=\"Positionnement correct\" \/><\/p>\n<\/div>\n<\/div>\n<div class=\"col-12 col-md-6 d-flex\">\n<div class=\"d-flex flex-column px-3 text-center w-100\">\n<p><img decoding=\"async\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/10\/blindage9.jpg\" alt=\"l\u00e9gende\" \/><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<h3 id=\"le-parametrage-des-equipements\">Le param\u00e9trage des \u00e9quipements<\/h3>\n<p>Certains param\u00e8tres doivent \u00eatre ajust\u00e9s pour que la communication soit possible entre les appareils. On notera qu&rsquo;il est tr\u00e8s important de v\u00e9rifier ces points qui constituent les erreurs les plus fr\u00e9quentes :<\/p>\n<ul>\n<li>L\u2019adressage Modbus, unique pour chaque \u00e9quipement de 1 \u00e0 247<\/li>\n<li>Vitesse de communication : de 1200 \u00e0 19200 bits\/seconde<\/li>\n<li>Les donn\u00e9es (trame) : 7 ou 8 bits<\/li>\n<li>La parit\u00e9 : Paire (even), impaire (odd) ou sans parit\u00e9 (none),<\/li>\n<li>Arr\u00eat : 1 ou 2 bits de stop<\/li>\n<\/ul>\n<h3 id=\"le-modbus-tcp\">Le Modbus TCP<\/h3>\n<p>Il fonctionne sur le mode <strong>client-serveur<\/strong>.<\/p>\n<p>Contrairement au protocole RTU, ce sont les <strong>clients qui sont actifs<\/strong> et doivent se connecter en protocole TCP, pour <strong>lire et \u00e9crire dans le serveur Modbus<\/strong>.<\/p>\n<p>Le serveur est identifi\u00e9 par son <strong>adresse IP<\/strong> et le <strong>num\u00e9ro de port<\/strong> (par d\u00e9faut 502). Les clients s&rsquo;y connectent \u00e0 l&rsquo;aide de ses informations et peuvent lire et \u00e9crire sur le serveur.<\/p>\n<p>Le <strong>nombre de clients \u00e9tant illimit\u00e9<\/strong>, ce protocole est id\u00e9al pour une communication externalis\u00e9e \u00e0 grande \u00e9chelle. Son essor est fulgurant depuis son <strong>encapsulation dans les trames Ethernet gr\u00e2ce \u00e0 MODBUS over TCP\/IP<\/strong>.<\/p>\n<h2 id=\"les-logiciels-dacquisition-et-de-traitement\">Les logiciels d\u2019acquisition et de traitement<\/h2>\n<p>Il existe divers logiciels sur le march\u00e9 permettant de <strong>lire<\/strong> et de <strong>programmer ses appareils<\/strong> ou bien des solutions plus compl\u00e8tes pour une <strong>supervision globale de ses \u00e9quipements<\/strong> (se reporter au cahier technique supervision).<\/p>\n<p><strong>Les compteurs d\u2019\u00e9nergie et centrales de mesures Lettel sont fournis avec leur logiciel de lecture et de param\u00e9trage, <\/strong>dont voici quelques copies d&rsquo;\u00e9cran :<strong><br \/>\n<\/strong><\/p>\n<ul>\n<li><strong><span style=\"color: #1b1945;\">Valeurs instantan\u00e9es :<\/span><\/strong><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-3156\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/valeurs-instantanees-300x110.jpg\" alt=\"valeurs-instantanees-modbus\" width=\"300\" height=\"110\" srcset=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/valeurs-instantanees-300x110.jpg 300w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/valeurs-instantanees-600x219.jpg 600w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/valeurs-instantanees-1024x374.jpg 1024w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/valeurs-instantanees-768x281.jpg 768w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/valeurs-instantanees.jpg 1261w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<ul>\n<li><strong><span style=\"color: #1b1945;\">Donn\u00e9es harmoniques :&nbsp;<\/span><\/strong><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-3154\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/donnees-harmoniques-300x219.jpg\" alt=\"donnees-harmoniques-modbus\" width=\"300\" height=\"219\" srcset=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/donnees-harmoniques-300x219.jpg 300w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/donnees-harmoniques-600x437.jpg 600w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/donnees-harmoniques-1024x746.jpg 1024w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/donnees-harmoniques-768x560.jpg 768w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/donnees-harmoniques.jpg 1250w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<ul>\n<li><strong><span style=\"color: #1b1945;\">Graphique vectoriel :<\/span><\/strong><\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"alignnone size-medium wp-image-3155\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/graphique-vectoriel-300x164.jpg\" alt=\"graphique-vectoriel-modbus\" width=\"300\" height=\"164\" srcset=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/graphique-vectoriel-300x164.jpg 300w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/graphique-vectoriel-600x328.jpg 600w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/graphique-vectoriel-1024x560.jpg 1024w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/graphique-vectoriel-768x420.jpg 768w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/01\/graphique-vectoriel.jpg 1251w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>&nbsp;<\/p>\n<div>\n<div style=\"padding: 40px; background-color: #1b1945; color: white; font-weight: 500; margin-top: 50px;\">\n<p><img decoding=\"async\" style=\"float: left; width: 70px !important; height: 70px !important; margin-right: 20px;\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2021\/11\/favicon.png\" \/>Besoin d\u2019aide suppl\u00e9mentaire ? N\u2019h\u00e9sitez pas \u00e0 contacter notre support technique.<\/p>\n<div style=\"display: flex; justify-content: center; margin-top: 20px;\"><a class=\"c-btn btn btn-c1\" href=\"mailto:support@lettel.fr\" target=\"_blank\" rel=\"noopener\">Support technique<\/a><\/div>\n<\/div>\n<\/div>\n                                    <\/div>\r\n\r\n                                    \r\n<div class=\"c-socials-share\">\r\n  <p class=\"c-ttl\">Partager ou r\u00e9sumer l&rsquo;article&nbsp;:<\/p>\r\n  <ul class=\"c-list\">\r\n    <li>\r\n      <a href=\"https:\/\/www.linkedin.com\/shareArticle?mini=true&#038;url=https:\/\/stage-lettel.fk-agency.net\/fr\/ressources\/communication-modbus\/&#038;title=La communication RS485 Modbus\" target=\"_blank\" onclick=\"javascript:window.open(this.href, '', 'menubar=no,toolbar=no,resizable=yes,scrollbars=yes,height=600,width=600');return false;\" title=\"Linkedin\">\r\n        <i class=\"bi bi-linkedin\"><\/i>\r\n      <\/a>\r\n    <\/li>\r\n    <li>\r\n    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href=\"https:\/\/claude.ai\/new?q=Peux-tu%20me%20faire%20un%20r%C3%A9sum%C3%A9%20de%20l%27article%20https%3A%2F%2Fstage-lettel.fk-agency.net%2Ffr%2Fressources%2Fcommunication-modbus%2F%20en%2050%20mots%2C%20en%20pr%C3%A9cisant%20les%20%C3%A9l%C3%A9ments%20cl%C3%A9s%20%C3%A0%20retenir%20%3F\" target=\"_blank\" rel=\"noopener\" title=\"Claude\">\r\n        <img decoding=\"async\" class=\"ico\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/themes\/lettel\/assets\/dist\/svg\/ico-claude-blue.svg\" alt=\"Claude\">\r\n      <\/a>\r\n    <\/li>\r\n\r\n      <\/ul>\r\n<\/div>\r\n\t\t\t\t\t<!-- ===== BLOC AUTEUR ===== -->\r\n                    \t\t\t\t\t<!-- ===== FIN BLOC AUTEUR ===== -->\r\n\r\n                            <\/div>\r\n\r\n            <aside class=\"col-lg-3 offset-lg-1 d-none d-lg-block \">\r\n                <div class=\"c-aside-wrp\">\r\n                    \r\n<div class=\"c-socials-share\">\r\n  <p class=\"c-ttl\">Partager ou r\u00e9sumer l&rsquo;article&nbsp;:<\/p>\r\n  <ul class=\"c-list\">\r\n    <li>\r\n      <a href=\"https:\/\/www.linkedin.com\/shareArticle?mini=true&#038;url=https:\/\/stage-lettel.fk-agency.net\/fr\/ressources\/communication-modbus\/&#038;title=La communication RS485 Modbus\" target=\"_blank\" onclick=\"javascript:window.open(this.href, '', 'menubar=no,toolbar=no,resizable=yes,scrollbars=yes,height=600,width=600');return false;\" title=\"Linkedin\">\r\n        <i class=\"bi bi-linkedin\"><\/i>\r\n      <\/a>\r\n    <\/li>\r\n    <li>\r\n      <a href=\"mailto:?subject=La communication RS485 Modbus&amp;body=https:\/\/stage-lettel.fk-agency.net\/fr\/ressources\/communication-modbus\/\" title=\"Email\">\r\n        <i class=\"bi bi-envelope-fill\"><\/i>\r\n      <\/a>\r\n    <\/li>\r\n    <li>\r\n      <a href=\"https:\/\/chatgpt.com\/?q=Peux-tu%20me%20faire%20un%20r%C3%A9sum%C3%A9%20de%20l%27article%20https%3A%2F%2Fstage-lettel.fk-agency.net%2Ffr%2Fressources%2Fcommunication-modbus%2F%20en%2050%20mots%2C%20en%20pr%C3%A9cisant%20les%20%C3%A9l%C3%A9ments%20cl%C3%A9s%20%C3%A0%20retenir%20%3F\" target=\"_blank\" rel=\"noopener\" title=\"ChatGPT\">\r\n        <img decoding=\"async\" class=\"ico\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/themes\/lettel\/assets\/dist\/svg\/ico-chatgpt-blue.svg\" alt=\"ChatGPT\">\r\n      <\/a>\r\n    <\/li>\r\n    <li>\r\n      <a href=\"https:\/\/claude.ai\/new?q=Peux-tu%20me%20faire%20un%20r%C3%A9sum%C3%A9%20de%20l%27article%20https%3A%2F%2Fstage-lettel.fk-agency.net%2Ffr%2Fressources%2Fcommunication-modbus%2F%20en%2050%20mots%2C%20en%20pr%C3%A9cisant%20les%20%C3%A9l%C3%A9ments%20cl%C3%A9s%20%C3%A0%20retenir%20%3F\" target=\"_blank\" rel=\"noopener\" title=\"Claude\">\r\n        <img decoding=\"async\" class=\"ico\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/themes\/lettel\/assets\/dist\/svg\/ico-claude-blue.svg\" alt=\"Claude\">\r\n      <\/a>\r\n    <\/li>\r\n\r\n      <\/ul>\r\n<\/div>                    <div class=\"c-nav\">\r\n                        <p class=\"c-nav_ttl\">Sommaire<\/p>\r\n                        <ul class='table-content'><li class='table-content_item-lvl-2'><a class='table-content_link' href='#presentation'>Pr\u00e9sentation<\/a><li><a class='table-content_link' href='#les-differents-protocoles-modbus'>Les diff\u00e9rents protocoles Modbus<\/a><ul class='table-content'><li class='table-content_item-lvl-3'><a class='table-content_link' href='#le-modbus-rtu'>Le Modbus RTU<\/a><li><a class='table-content_link' href='#cablage-et-bus-rs485'>C\u00e2blage et bus RS485<\/a><li><a class='table-content_link' href='#resistance-aux-interferences-electromagnetiques'>R\u00e9sistance aux interf\u00e9rences \u00e9lectromagn\u00e9tiques<\/a><li><a class='table-content_link' href='#le-parametrage-des-equipements'>Le param\u00e9trage des \u00e9quipements<\/a><li><a class='table-content_link' href='#le-modbus-tcp'>Le Modbus TCP<\/a><\/ul><li class='table-content_item-lvl-2'><a class='table-content_link' href='#les-logiciels-dacquisition-et-de-traitement'>Les logiciels d\u2019acquisition et de traitement<\/a><\/li><\/ul>                    <\/div>\r\n                <\/div>\r\n            <\/aside>\r\n        <\/div>\r\n\r\n    <\/div>\r\n<\/section>\r\n\r\n\n\n\r\n\r\n<section class=\"blc-related-posts bg-cg spc-s3\">\r\n\r\n\t\t<header class=\"c-heading\">\r\n\t\t\t<div class=\"container\">\r\n\t\t\t\t<h2 class=\"c-ttl\" class=\"c-ttl\" id=\"les-autres-actualites-lettel\">Les autres actualit\u00e9s Lettel<\/h2>\r\n\t\t\t<\/div>\r\n\t\t<\/header>\r\n\r\n\t\t<div class=\"container\">\r\n\t\t\t<div class=\"swiper\" swiper-type=\"3\">\r\n\t\t\t\t<div class=\"swiper-wrapper\">\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<article class=\"swiper-slide\" id='2837'>\r\n\t\t\t\t\t\t\t\r\n<a class=\"c-card-post\" href='https:\/\/stage-lettel.fk-agency.net\/fr\/ressources\/les-transformateurs-de-courant\/'>\r\n\t<figure class=\"media-wrp__4x3\">\r\n\t\t<img decoding=\"async\" class=\"media\" alt=\"tc-vignette-logo\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/02\/tc-vignette.jpg\" srcset=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/02\/tc-vignette-300x255.jpg 300w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/02\/tc-vignette-600x509.jpg 600w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/02\/tc-vignette.jpg 732w\" sizes=\"(min-width: 992px) 397px, (min-width: 1200px) 480px, (min-width: 1400px) 560px, (min-width: 1600px) 640px, 100vw\">\r\n\t<\/figure>\r\n\t<div class=\"c-txt\">\r\n\t\t\t<p class=\"c-ttl c-ttl__md ttl-brd\">Les transformateurs de courant<\/p>\r\n\t\t\t<h3 class=\"c-desc\" class=\"c-desc\" id=\"leur-fonctionnement-les-differents-types-les-classes-de-precision\">Leur fonctionnement, les diff\u00e9rents types, les classes de pr\u00e9cision, &#8230;<\/h3>\r\n\t\t\t<p class=\"c-date\">Publi\u00e9 le 26 janvier 2022<\/p>\r\n\t\t\t<button class=\"c-link\">En savoir plus<\/button>\r\n\t<\/div>\r\n<\/a>\t\t\t\t\t\t<\/article>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<article class=\"swiper-slide\" id='9793'>\r\n\t\t\t\t\t\t\t\r\n<a class=\"c-card-post\" href='https:\/\/stage-lettel.fk-agency.net\/fr\/ressources\/accessoire-cablage\/'>\r\n\t<figure class=\"media-wrp__4x3\">\r\n\t\t<img decoding=\"async\" class=\"media\" alt=\"Armoire \u00e9lectrique\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/06\/armoire-elec.jpg\" srcset=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/06\/armoire-elec-300x300.jpg 300w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/06\/armoire-elec-150x150.jpg 150w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/06\/armoire-elec-768x768.jpg 768w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/06\/armoire-elec-600x600.jpg 600w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/06\/armoire-elec-100x100.jpg 100w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2025\/06\/armoire-elec.jpg 800w\" sizes=\"(min-width: 992px) 397px, (min-width: 1200px) 480px, (min-width: 1400px) 560px, (min-width: 1600px) 640px, 100vw\">\r\n\t<\/figure>\r\n\t<div class=\"c-txt\">\r\n\t\t\t<p class=\"c-ttl c-ttl__md ttl-brd\">Les accessoires de c\u00e2blage<\/p>\r\n\t\t\t<h3 class=\"c-desc\" class=\"c-desc\" id=\"enjeux-criteres-de-choix-et-securite\">Enjeux, crit\u00e8res de choix et s\u00e9curit\u00e9<\/h3>\r\n\t\t\t<p class=\"c-date\">Publi\u00e9 le 19 juin 2025<\/p>\r\n\t\t\t<button class=\"c-link\">En savoir plus<\/button>\r\n\t<\/div>\r\n<\/a>\t\t\t\t\t\t<\/article>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<article class=\"swiper-slide\" id='9807'>\r\n\t\t\t\t\t\t\t\r\n<a class=\"c-card-post\" href='https:\/\/stage-lettel.fk-agency.net\/fr\/ressources\/decret-bacs\/'>\r\n\t<figure class=\"media-wrp__4x3\">\r\n\t\t<img decoding=\"async\" class=\"media\" alt=\"immeubles BACS\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2024\/03\/BACS.webp\" srcset=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2024\/03\/BACS-300x194.webp 300w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2024\/03\/BACS-600x388.webp 600w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2024\/03\/BACS.webp 735w\" sizes=\"(min-width: 992px) 397px, (min-width: 1200px) 480px, (min-width: 1400px) 560px, (min-width: 1600px) 640px, 100vw\">\r\n\t<\/figure>\r\n\t<div class=\"c-txt\">\r\n\t\t\t<p class=\"c-ttl c-ttl__md ttl-brd\">Comprendre le D\u00e9cret BACS<\/p>\r\n\t\t\t<h3 class=\"c-desc\" class=\"c-desc\" id=\"champ-dapplication-mesures-phares-et-enjeux\">Champ d\u2019application, mesures phares et enjeux<\/h3>\r\n\t\t\t<p class=\"c-date\">Publi\u00e9 le 10 f\u00e9vrier 2025<\/p>\r\n\t\t\t<button class=\"c-link\">En savoir plus<\/button>\r\n\t<\/div>\r\n<\/a>\t\t\t\t\t\t<\/article>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<article class=\"swiper-slide\" id='3985'>\r\n\t\t\t\t\t\t\t\r\n<a class=\"c-card-post\" href='https:\/\/stage-lettel.fk-agency.net\/fr\/ressources\/classe-de-precision-compteur-electrique\/'>\r\n\t<figure class=\"media-wrp__4x3\">\r\n\t\t<img decoding=\"async\" class=\"media\" alt=\"classe-de-precision-compteur-loupe-greyscaled-vignette\" src=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/05\/classe-de-precision-compteur-loupe-greyscaled-vignette.jpg\" srcset=\"https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/05\/classe-de-precision-compteur-loupe-greyscaled-vignette-300x225.jpg 300w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/05\/classe-de-precision-compteur-loupe-greyscaled-vignette-600x450.jpg 600w, https:\/\/stage-lettel.fk-agency.net\/wp-content\/uploads\/2022\/05\/classe-de-precision-compteur-loupe-greyscaled-vignette.jpg 652w\" sizes=\"(min-width: 992px) 397px, (min-width: 1200px) 480px, (min-width: 1400px) 560px, (min-width: 1600px) 640px, 100vw\">\r\n\t<\/figure>\r\n\t<div class=\"c-txt\">\r\n\t\t\t<p class=\"c-ttl c-ttl__md ttl-brd\">Classes de pr\u00e9cision d&rsquo;un compteur \u00e9lectrique<\/p>\r\n\t\t\t<h3 class=\"c-desc\" class=\"c-desc\" id=\"le-cadre-normatif-et-les-differentes-classes-selon-les-applications\">Le cadre normatif et les diff\u00e9rentes classes selon les applications<\/h3>\r\n\t\t\t<p class=\"c-date\">Publi\u00e9 le 30 mai 2022<\/p>\r\n\t\t\t<button class=\"c-link\">En savoir plus<\/button>\r\n\t<\/div>\r\n<\/a>\t\t\t\t\t\t<\/article>\r\n\t\t\t\t\t\t\t\t\t\r\n\t\t\t\t<\/div>\r\n\t\t\t\t<div class=\"b-pagi swiper-pagination\"><\/div>\r\n\t\t\t<\/div>\r\n\t\t\t<div class=\"container container-navi\">\r\n\t\t\t\t<div class=\"swiper-button-prev\"><\/div>\r\n\t\t\t\t<div class=\"swiper-button-next\"><\/div>\r\n\t\t\t<\/div>\r\n\t\t<\/div>\r\n\r\n<\/section>\r\n\r\n\n\n\r\n\r\n<section class=\"blc-banner spc-s3 bg-c4\"> \r\n\t<div class=\"container tpl1\">\r\n\r\n\t\t<div class=\"row\">\r\n\t\t\t<div class=\"b-txt col-lg-6\">\r\n\t\t\t\t<h2 class=\"b-ttl\" data-aos=\"fade-up\" class=\"b-ttl\" data-aos=\"fade-up\" id=\"vous-souhaitez-etre-conseille\">Vous souhaitez \u00eatre conseill\u00e9&nbsp;?<\/h2>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"btn btn-c1\" data-aos=\"fade-up\" data-aos-delay=\"150\" 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