{"id":3634,"date":"2025-04-21T05:54:44","date_gmt":"2025-04-21T05:54:44","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&p=3634"},"modified":"2025-06-10T12:12:26","modified_gmt":"2025-06-10T12:12:26","slug":"error-handling-in-spx-communications-instructions","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/error-handling-in-spx-communications-instructions\/","title":{"rendered":"Error handling in SPx communications instructions"},"content":{"rendered":"\n

There are two possible error conditions resulting from an SPx communications instruction: Missing SPx peripheral and invalid command sent to a SPx peripheral. Both are fatal errors.<\/p>\n\n\n\n

If the addressed SPx peripheral is not present there will no response to messages. The SPLat processor will make 10 tries on a message before giving up. It will then execute a run time error restart, recording error type (Missing SPx peripheral) and program address.<\/p>\n\n\n\n

There is one exception, which is the “Are You There” message (SPxCmd0 with cc=127). If this fails to get a response after 10 tries, the SPLat processor will set U(0) to False and then continue. This provides a mechanism for your program to determine the presence of possibly optional SPx peripherals.<\/p>\n\n\n\n

If the addressed SPx peripheral is present but is sent a command that is not valid for it, or which it cannot currently execute (the peripheral might be busy or in the wrong state) it will send back a NACK (Negative ACKnowledge). This will be a result of a\u00a0SPLatWare<\/a>\u00a0programming error. The SPLat processor will make 10 tries on a message before giving up. It will then execute a run time error restart, recording the error type (Invalid command to SPx peripheral) and program address.<\/p>\n","protected":false},"excerpt":{"rendered":"

There are two possible error conditions resulting from an SPx communications instruction: Missing SPx peripheral and invalid command sent to a SPx peripheral. Both are…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3629,"menu_order":9,"template":"","class_list":["post-3634","spl_knowledgebase","type-spl_knowledgebase","status-publish","hentry"],"acf":[],"yoast_head":"\nError handling in SPx communications instructions - 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=\"Error handling in SPx communications instructions - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"There are two possible error conditions resulting from an SPx communications instruction: Missing SPx peripheral and invalid command sent to a SPx peripheral. Both are...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/error-handling-in-spx-communications-instructions\/\" \/>\n<meta property=\"og:site_name\" content=\"SPLat Controls\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-10T12:12:26+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/error-handling-in-spx-communications-instructions\/\",\"url\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/error-handling-in-spx-communications-instructions\/\",\"name\":\"Error handling in SPx communications instructions - SPLat Controls\",\"isPartOf\":{\"@id\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/#website\"},\"datePublished\":\"2025-04-21T05:54:44+00:00\",\"dateModified\":\"2025-06-10T12:12:26+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/error-handling-in-spx-communications-instructions\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/error-handling-in-spx-communications-instructions\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/error-handling-in-spx-communications-instructions\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Tutorials, application notes and white papers\",\"item\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"The SPLat Expansion Framework\",\"item\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"SPx communications instructions\",\"item\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/\"},{\"@type\":\"ListItem\",\"position\":5,\"name\":\"Error handling in SPx communications instructions\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/#website\",\"url\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/\",\"name\":\"SPLat Controls\",\"description\":\"OEM Embedded Machine Controllers\",\"publisher\":{\"@id\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/#organization\",\"name\":\"SPLat Controls\",\"url\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-content\/uploads\/2024\/10\/logo.svg\",\"contentUrl\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-content\/uploads\/2024\/10\/logo.svg\",\"caption\":\"SPLat Controls\"},\"image\":{\"@id\":\"https:\/\/webprojects.cloud\/wordpress\/splatco\/#\/schema\/logo\/image\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Error handling in SPx communications instructions - SPLat Controls","robots":{"index":"noindex","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"og_locale":"en_US","og_type":"article","og_title":"Error handling in SPx communications instructions - SPLat Controls","og_description":"There are two possible error conditions resulting from an SPx communications instruction: Missing SPx peripheral and invalid command sent to a SPx peripheral. Both are...","og_url":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/error-handling-in-spx-communications-instructions\/","og_site_name":"SPLat Controls","article_modified_time":"2025-06-10T12:12:26+00:00","twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/error-handling-in-spx-communications-instructions\/","url":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/error-handling-in-spx-communications-instructions\/","name":"Error handling in SPx communications instructions - SPLat Controls","isPartOf":{"@id":"https:\/\/webprojects.cloud\/wordpress\/splatco\/#website"},"datePublished":"2025-04-21T05:54:44+00:00","dateModified":"2025-06-10T12:12:26+00:00","breadcrumb":{"@id":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/error-handling-in-spx-communications-instructions\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/error-handling-in-spx-communications-instructions\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/error-handling-in-spx-communications-instructions\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/webprojects.cloud\/wordpress\/splatco\/"},{"@type":"ListItem","position":2,"name":"Tutorials, application notes and white papers","item":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/"},{"@type":"ListItem","position":3,"name":"The SPLat Expansion Framework","item":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/"},{"@type":"ListItem","position":4,"name":"SPx communications instructions","item":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/spx-communications-instructions\/"},{"@type":"ListItem","position":5,"name":"Error handling in SPx communications instructions"}]},{"@type":"WebSite","@id":"https:\/\/webprojects.cloud\/wordpress\/splatco\/#website","url":"https:\/\/webprojects.cloud\/wordpress\/splatco\/","name":"SPLat Controls","description":"OEM Embedded Machine Controllers","publisher":{"@id":"https:\/\/webprojects.cloud\/wordpress\/splatco\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/webprojects.cloud\/wordpress\/splatco\/#organization","name":"SPLat Controls","url":"https:\/\/webprojects.cloud\/wordpress\/splatco\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/webprojects.cloud\/wordpress\/splatco\/#\/schema\/logo\/image\/","url":"https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-content\/uploads\/2024\/10\/logo.svg","contentUrl":"https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-content\/uploads\/2024\/10\/logo.svg","caption":"SPLat Controls"},"image":{"@id":"https:\/\/webprojects.cloud\/wordpress\/splatco\/#\/schema\/logo\/image\/"}}]}},"_links":{"self":[{"href":"https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-json\/wp\/v2\/spl_knowledgebase\/3634","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-json\/wp\/v2\/spl_knowledgebase"}],"about":[{"href":"https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-json\/wp\/v2\/types\/spl_knowledgebase"}],"author":[{"embeddable":true,"href":"https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-json\/wp\/v2\/users\/1"}],"up":[{"embeddable":true,"href":"https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-json\/wp\/v2\/spl_knowledgebase\/3629"}],"wp:attachment":[{"href":"https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-json\/wp\/v2\/media?parent=3634"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}