{"id":1429,"date":"2025-04-11T04:52:07","date_gmt":"2025-04-11T04:52:07","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&#038;p=1429"},"modified":"2025-06-10T06:06:27","modified_gmt":"2025-06-10T06:06:27","slug":"mmi203-making-external-connections","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/product-documentation\/product-documentation-controllers\/mmi203-product-documentation\/mmi203-making-external-connections\/","title":{"rendered":"MMi203: Making external connections"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"400\" height=\"365\" src=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-content\/uploads\/2025\/04\/MMi203-Making-external.jpg\" alt=\"\" class=\"wp-image-1430\" srcset=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-content\/uploads\/2025\/04\/MMi203-Making-external.jpg 400w, https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-content\/uploads\/2025\/04\/MMi203-Making-external-300x274.jpg 300w, https:\/\/webprojects.cloud\/wordpress\/splatco\/wp-content\/uploads\/2025\/04\/MMi203-Making-external-64x58.jpg 64w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/figure>\n\n\n\n<p>The above picture shows all the connectors used for making external connections to the MMi203 and its predecessors. Moving clockwise from the top these are:<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">Inputs 0-3 and 4-7<\/h6>\n\n\n\n<p>There are two 5-pin connectors for external digital inputs. Each connector has 4 signal pins and one common (ground). The wiring for these is detailed under\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/product-documentation\/product-documentation-controllers\/mmi203-product-documentation\/mmi203-external-inputs-and-outputs\/mmi203-external-digital-inputs-2\/\">MMi203 external digital inputs<\/a>.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">Power<\/h6>\n\n\n\n<p>This 2-pin connector is for applying power to the MMi203. The wiring and power supply requirements are described under\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/product-documentation\/product-documentation-controllers\/mmi203-product-documentation\/mmi203-power-supply\/\">MMi203 Power supply<\/a>.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">SPx<\/h6>\n\n\n\n<p>The SPx expansion scheme is documented\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/the-splat-expansion-framework\/the-splat-expansion-framework\/external-spx-peripherals\/\">elsewhere<\/a>\u00a0in the SPLat Knowledge Base.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">Outputs 0-3 and 4-7<\/h6>\n\n\n\n<p>These two 5-pin connectors are for the 8 external outputs. Each connector has the positive power supply pin brought out. The use and wiring of these is detailed under\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/product-documentation\/product-documentation-controllers\/mmi203-product-documentation\/mmi203-external-inputs-and-outputs\/mmi203-external-digital-outputs\/\">MMi203 external digital outputs<\/a>.<\/p>\n\n\n\n<p>CAUTION: Take care never to short an output pin to the positive common pin. If the output is on at the time you will blow up the output chip instantly!<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">Analog out<\/h6>\n\n\n\n<p>This 4-pin connector is for the 2 analog outputs. There are 2 signal pins and 2 ground wires. The use and wiring is documented under\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/product-documentation\/product-documentation-controllers\/mmi203-product-documentation\/mmi203-external-inputs-and-outputs\/mmi203-external-analog-outputs\/\">MMi203 external analog outputs<\/a>.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">Analog in<\/h6>\n\n\n\n<p>This 4-pin connector is for the 2 analog inputs. There are 2 signal pins and 2 ground wires. The use and wiring is documented under\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/product-documentation\/product-documentation-controllers\/mmi203-product-documentation\/mmi203-external-inputs-and-outputs\/mmi203-external-analog-inputs\/\">MMi203 external analog inputs<\/a>.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\"><a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/glossary-of-terms\/#o366\">SPice<\/a><\/h6>\n\n\n\n<p>This connector is for low cost SPice add-on boards. Normally you would simply plug a compatible board onto this connector. Some information about the connector is provided under\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/product-documentation\/product-documentation-controllers\/mmi203-product-documentation\/mmi203-spice-connector\/\">MMi203 SPice connector<\/a>.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">LCD<\/h6>\n\n\n\n<p>The LCD connector supports a character\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/product-documentation\/product-documentation-controllers\/mmi203-product-documentation\/mmi203-operator-interface\/mmi203-liquid-crystal-display\/\">Liquid Crystal Display<\/a>.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">Comms<\/h6>\n\n\n\n<p>This connector is for communications to a PC either directly or via a modem. The various uses are documented in many places throughout the SPLat Knowledge Base. You will find an overview under\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/product-documentation\/product-documentation-controllers\/mmi203-product-documentation\/mmi202-comms-connector\/\">MMi203 Comms connector<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The above picture shows all the connectors used for making external connections to the MMi203 and its predecessors. Moving clockwise from the top these are:&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1422,"menu_order":2,"template":"","class_list":["post-1429","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>MMi203: Making external connections - 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=\"MMi203: Making external connections - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"The above picture shows all the connectors used for making external connections to the MMi203 and its predecessors. 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