{"id":1384,"date":"2025-04-10T11:41:15","date_gmt":"2025-04-10T11:41:15","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&#038;p=1384"},"modified":"2025-04-28T06:48:16","modified_gmt":"2025-04-28T06:48:16","slug":"hmi430-700-rs485-serial-port","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-rs485-serial-port\/","title":{"rendered":"HMI430\/700: RS485 serial port"},"content":{"rendered":"\n<p>The HMI430\/700 has one RS485 port which may be used for MODBUS, custom serial communications or Xwire.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">RS485 MODBUS or Custom<\/h6>\n\n\n\n<p>When using MODBUS or custom communications, the address for this port is 254.<\/p>\n\n\n\n<p>The easiest way to configure this port for MODBUS or custom communications is to use the\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/hash-commands-and-functions\/open_serial-hash-command\/\">#Open_Serial<\/a>\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 COM485 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 \"COM485\" to 254)<br>   #Open_Serial Port(COM485) User(38400,8,N)  ;open COM485 @ 38400<br>   iiPrintText  COM485,\"Hello World\",13,10    ;send text out COM485<\/pre>\n\n\n\n<p>The HMI430 fully supports both MODBUS Master and MODBUS Slave.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">RS485 Xwire<\/h6>\n\n\n\n<p>At power on, Xwire is set to use the Xwire TTL port.\u00a0 If you want to switch Xwire to use the RS485 port instead, then use the\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/xwire-instructions\/xwirephys-nn-d28\/\">XwirePhys<\/a>\u00a0instruction.\u00a0 On the HMI XwirePhys can take one of two values:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>0: Set Xwire to use the dedicated TTL Xwire port.&nbsp; RS485 is available for MODBUS or custom communications.<\/li>\n\n\n\n<li>1: Set Xwire to use the RS485 port.&nbsp; MODBUS or custom communications is now unavailable on this port.<\/li>\n<\/ul>\n\n\n\n<p>You may call XwirePhys at any time and may even switch back and forth at any time.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The HMI430\/700 has one RS485 port which may be used for MODBUS, custom serial communications or Xwire. RS485 MODBUS or Custom When using MODBUS or&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1381,"menu_order":1,"template":"","class_list":["post-1384","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: RS485 serial port - 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: RS485 serial port - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"The HMI430\/700 has one RS485 port which may be used for MODBUS, custom serial communications or Xwire. 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