{"id":5854,"date":"2016-11-21T21:46:34","date_gmt":"2016-11-21T20:46:34","guid":{"rendered":"http:\/\/www.espai.es\/blog\/?p=5854"},"modified":"2016-11-23T13:34:28","modified_gmt":"2016-11-23T12:34:28","slug":"protocolo-modbus","status":"publish","type":"post","link":"https:\/\/www.espai.es\/blog\/2016\/11\/protocolo-modbus\/","title":{"rendered":"PROTOCOLO MODBUS: COMUNICACI\u00d3N  ARDUINO vs ANDROID"},"content":{"rendered":"<p>En los \u00faltimos tiempos est\u00e1n en auge las tecnolog\u00edas asociadas a los sistemas dom\u00f3ticos. Existen muchas alternativas tecnol\u00f3gicas que nos permiten hoy en d\u00eda tener en un m\u00f3vil la informaci\u00f3n de un proceso f\u00edsico que est\u00e1 pasando a centenares de kil\u00f3metros. De entre estas alternativas podemos destacar:<\/p>\n<ul>\n<li>Arduino: Sus procesadores de bajo coste y su facilidad de programaci\u00f3n y de despliegue ofrecen m\u00faltiples aplicaciones al campo de la dom\u00f3tica.<\/li>\n<li>Android: Es el sistema operativo de una importante cuota de mercado de m\u00f3viles, programables con la herramienta Android Studio.<\/li>\n<li>Modbus: Protocolo que permite comunicar Arduino con Android a trav\u00e9s de TCP\/IP (arquitectura cliente\/servidor).<\/li>\n<\/ul>\n<p>Modbus es un protocolo de comunicaciones a nivel aplicaci\u00f3n (como http), dise\u00f1ado en 1979 por Modicon para su gama de controladores l\u00f3gicos programables (PLCs).<\/p>\n<p>Es un protocolo de comunicaciones superior a otros, debido a que es p\u00fablico, su implementaci\u00f3n es f\u00e1cil, requiere poco desarrollo y existen librer\u00edas para multitud de dispositivos. Es un protocolo de comunicaciones est\u00e1ndar de facto en la industria.<\/p>\n<p>Para mostrar el funcionamiento del protocolo modbus, utilizaremos la siguiente maqueta de red, que simula un caso real de comunicaci\u00f3n entre un arduino y un m\u00f3vil android.<\/p>\n<p><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5988 size-full\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/3.png\" alt=\"Protocolo Modbus\" width=\"557\" height=\"258\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/3.png 557w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/3-300x139.png 300w\" sizes=\"auto, (max-width: 557px) 100vw, 557px\" \/><\/a><\/p>\n<p>Primero de todo tenemos que explicar c\u00f3mo se pone un arduino en la red. Se hace con un shield de ethernet para arduino.<\/p>\n<p><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/4.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5992 size-medium\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/4-300x218.png\" alt=\"Protocolo Modbus\" width=\"300\" height=\"218\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/4-300x218.png 300w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/4.png 563w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/SKU083549C.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5993 size-medium\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/SKU083549C-300x300.jpg\" alt=\"Protocolo Modbus\" width=\"300\" height=\"300\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/SKU083549C-300x300.jpg 300w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/SKU083549C-150x150.jpg 150w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/SKU083549C.jpg 600w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>El encaje entre el shield ethetrnet y la placa arduino es muy sencillo e intuitivo. Debemos conectar el shield arduino con un cable UTP cruzado al router.<\/p>\n<p>En la placa arduino introducimos el siguiente c\u00f3digo, el cual necesita de las librerias Mudbus.cpp y Mudbus.h.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5994 size-full\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/1.png\" alt=\"1\" width=\"700\" height=\"741\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/1.png 700w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/1-283x300.png 283w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/a><\/p>\n<p>En este c\u00f3digo vemos dos cosas importantes: Por un lado dota al equipo arduino de direcci\u00f3n MAC, IP, gateway y subred (se le podr\u00e1 hacer pings y el responder\u00e1, ser\u00e1 como un equipo m\u00e1s en red). Y por otro lado vemos que cada 10 milisegundos, carga o actualiza 3 valores del circuito arduino en los 3 primeros registros R del protocolo Mudbus, preparados para ser leidos desde otro dispositivo mediante comunicaci\u00f3n TCP\/IP.<\/p>\n<p>A continuaci\u00f3n debemos conectar nuestro dispositivo m\u00f3vil Android a la wifi de nuestro router. Dicho router habr\u00e1 sido configurado para dar por dhcp direcciones IP por encima de la direcci\u00f3n 10, para no tener conflictos (por ejemplo entre 192.168.1.20 &#8211; 192.168.1.100).<\/p>\n<p>El siguiente c\u00f3digo ejecutado en un android nos permitir\u00e1 acceder a los registros del protocolo Mudbus cargados con valores de la placa arduino:<\/p>\n<p><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/modbus3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5860 size-full\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/modbus3.png\" alt=\"modbus3\" width=\"643\" height=\"828\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/modbus3.png 643w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/modbus3-233x300.png 233w\" sizes=\"auto, (max-width: 643px) 100vw, 643px\" \/><\/a><\/p>\n<p>El c\u00f3digo anterior s\u00f3lo realiza una conexi\u00f3n y obtiene los valores de los registros R en el momento en que se realiza la consulta. Si se desea obtener en directo los valores de la placa arduino, se deben de hacer m\u00e1s llamadas a esta funci\u00f3n.<\/p>\n<p>Al tratarse de una aplicaci\u00f3n android y de una comunicaci\u00f3n via TCP\/IP, \u00e9sta tiene que hacerse mediante threads, puesto que el hilo principal de una aplicaci\u00f3n no puede lanzar una consulta Modbus TCP\/IP. Android obliga a hacer estas acciones a trav\u00e9s de un thread especial, el AsynTask, que es quien centraliza toda comunicaci\u00f3n TCP\/IP en un m\u00f3vil Android.<\/p>\n<p><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/modbus2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-5859 size-full\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/modbus2.png\" alt=\"modbus2\" width=\"560\" height=\"610\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/modbus2.png 560w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2016\/10\/modbus2-275x300.png 275w\" sizes=\"auto, (max-width: 560px) 100vw, 560px\" \/><\/a><\/p>\n<p>Esperamos que os haya gustado y hasta el pr\u00f3ximo art\u00edculo de Escola Espai!!!<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>En los \u00faltimos tiempos est\u00e1n en auge las tecnolog\u00edas asociadas a los sistemas dom\u00f3ticos. Existen muchas alternativas tecnol\u00f3gicas que nos permiten hoy en d\u00eda tener en un m\u00f3vil la informaci\u00f3n de un proceso f\u00edsico que est\u00e1 pasando a centenares de kil\u00f3metros. De entre estas alternativas&#8230;<\/p>\n","protected":false},"author":18,"featured_media":6001,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_ef_editorial_meta_date_first-draft-date":"","_ef_editorial_meta_paragraph_assignment":"","_ef_editorial_meta_checkbox_needs-photo":"","_ef_editorial_meta_number_word-count":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[218,5,1,101],"tags":[100,166,528,89],"class_list":["post-5854","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-escola-espai","category-programacion","category-sin-categoria","category-telefonia-movil","tag-android","tag-arduino","tag-escola-espai","tag-programacion-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - 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