{"id":1383,"date":"2025-04-10T11:40:45","date_gmt":"2025-04-10T11:40:45","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&#038;p=1383"},"modified":"2025-04-28T06:42:28","modified_gmt":"2025-04-28T06:42:28","slug":"hmi430-700-ttl-serial-ports","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/product-documentation\/product-documentation-controllers\/hmi430-700-product-documentation\/hmi430-700-communication-ports\/hmi430-700-ttl-serial-ports\/","title":{"rendered":"HMI430\/700: TTL serial ports"},"content":{"rendered":"\n<p>The HMI430\/700 has two TTL serial ports which may be used for MODBUS master\/slave or custom serial communications.&nbsp; They are labeled COM0 and COM1. The address for these ports is as follows:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>COM0: 252<\/li>\n\n\n\n<li>COM1: 253<\/li>\n<\/ul>\n\n\n\n<p>The HMI700 also has a RS232 port that is shared with COM0.<\/p>\n\n\n\n<p>The easiest way to configure these ports is to use the\u00a0#Open_Serial\u00a0instruction together with the\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/deprecated\/4d_visi-hash-command-multitrack-only\/portp-hash-function\/\">#Port()<\/a>\u00a0directive.\u00a0 Here&#8217;s an example of opening COM1 for user communications at 38400 baud and sending a &#8220;Hello World&#8221; message:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">   #Include     File( \"<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-content\/uploads\/2025\/04\/hmi430_io-3.spt\">hmi430_io.spt<\/a>\" )     ;include the HMI430 I\/O map (this sets \"COM1\" to 252)<br>   #Open_Serial Port(COM1) User(38400,8,N)  ;open COM1 @ 38400<br>   iiPrintText  COM1,\"Hello World\",13,10    ;send text out COM1<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>The HMI430\/700 has two TTL serial ports which may be used for MODBUS master\/slave or custom serial communications.&nbsp; They are labeled COM0 and COM1. The&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1381,"menu_order":0,"template":"","class_list":["post-1383","spl_knowledgebase","type-spl_knowledgebase","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>HMI430\/700: TTL serial ports - SPLat Controls<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"HMI430\/700: TTL serial ports - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"The HMI430\/700 has two TTL serial ports which may be used for MODBUS master\/slave or custom serial communications.&nbsp; They are labeled COM0 and COM1. 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