{"id":3633,"date":"2025-04-21T05:55:34","date_gmt":"2025-04-21T05:55:34","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&#038;p=3633"},"modified":"2025-06-10T12:10:14","modified_gmt":"2025-06-10T12:10:14","slug":"spxcmd0-ccaaaa-out","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\/spxcmd0-ccaaaa-out\/","title":{"rendered":"SPxCmd0 cc,aaaa [Out]"},"content":{"rendered":"\n<p>This instruction results in 0 bytes of data being sent to the peripheral. This would be used either to send a simple command to the peripheral or to elicit a true\/false response.<\/p>\n\n\n\n<p>There are 128 command codes available with this instruction. Code 127 is reserved for a special purpose. That leaves codes 0-126 (127 possibilities).<\/p>\n\n\n\n<p>This instruction is designed to provide simple trigger commands or on\/off commands. For example, it could be used to provide on\/off commands to up to 63 bits of output on a peripheral.<\/p>\n\n\n\n<p>The peripheral will respond with a True or a False. This will be saved in U(0). This gives the possibility of polling up to 127 inputs or internal on\/off semaphores in a peripheral.<\/p>\n\n\n\n<p>Remember that it is entirely a function of the peripheral how it reacts to a command, and likewise the significance of the True\/False response is a function of the peripheral. For example, in one peripheral the command may cause it to start a machine, while in another it may simply want it to report its state of readiness.<\/p>\n\n\n\n<p>The instruction SPxCmd0 127,aaaa (i.e. with cc=127) has a special function. It is used as an &#8220;Are you there?&#8221; poll to peripheral aaaa. The peripheral must respond by sending back a True value, which is saved in U(0). If no peripheral responds, U(0) will be set to False. All other cases of a peripheral not responding to an SPx instruction result in a fatal run-rime error and full reset, i.e. the SPLat processor will turn off all outputs and start executing its program from the start.<\/p>\n\n\n\n<p>This is a low-level instruction associated with the\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/introduction\/\">SPLat Expansion Framework<\/a>. You will most likely never need to know how to use it.<\/p>\n\n\n\n<p>See also\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/expansion-support-in-splat-pc-v6\/error-handling-in-spx-communications-instructions\/\">Error handling in SPx transfer instructions<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This instruction results in 0 bytes of data being sent to the peripheral. This would be used either to send a simple command to the&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3629,"menu_order":0,"template":"","class_list":["post-3633","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>SPxCmd0 cc,aaaa [Out] - 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=\"SPxCmd0 cc,aaaa [Out] - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"This instruction results in 0 bytes of data being sent to the peripheral. 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