{"id":1477,"date":"2025-04-11T05:44:31","date_gmt":"2025-04-11T05:44:31","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&#038;p=1477"},"modified":"2025-06-10T06:11:25","modified_gmt":"2025-06-10T06:11:25","slug":"mmi203-comms-connector","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/product-documentation\/product-documentation-controllers\/mmi203-product-documentation\/mmi203-comms-connector\/","title":{"rendered":"MMi203: Comms connector"},"content":{"rendered":"\n<p>The comms connector is a standard DB9. It provides an RS232 compatible interface. It is used for communications with a PC for programming and use with SPLatLink.<\/p>\n\n\n\n<p>The RS232 interface is a basic interface with transmit data, receive data and ground. Pinouts are as follows:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><th>Pin<\/th><th>Signal name<\/th><th>Comments<\/th><\/tr><tr><th>1<\/th><td>&nbsp;<\/td><td>Not connected<\/td><\/tr><tr><th>2<\/th><td>RxD<\/td><td>Serial data output from board<\/td><\/tr><tr><th>3<\/th><td>TxD<\/td><td>Serial data input to board<\/td><\/tr><tr><th>4<\/th><td>&nbsp;<\/td><td>Not connected<\/td><\/tr><tr><th>5<\/th><td>Gnd<\/td><td>0V, signal ground<\/td><\/tr><tr><th>6<\/th><td>&nbsp;<\/td><td>Not connected<\/td><\/tr><tr><th>7<\/th><td>&nbsp;<\/td><td>Not connected<\/td><\/tr><tr><th>8<\/th><td>CTS<\/td><td>Hard-wired to +5V for accessory power<\/td><\/tr><tr><th>9<\/th><td>&nbsp;<\/td><td>Not connected<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>This is a DCE (&#8220;looks like a modem&#8221;) interface, suitable for connection to a DTE, such as a computer, with a straight-through cable.<\/p>\n\n\n\n<p>To connect the SPLat to another DCE, like a modem, you must use a&nbsp;<em>crossover<\/em>&nbsp;cable. The cable will need the following wiring:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><th>pin<\/th><th>pin<\/th><\/tr><tr><td>1<\/td><td>&nbsp;<\/td><\/tr><tr><td>2 RxD<\/td><td>3 TxD<\/td><\/tr><tr><td>3 TxD<\/td><td>2 RxD<\/td><\/tr><tr><td>4<\/td><td>&nbsp;<\/td><\/tr><tr><td>5 Gnd<\/td><td>5 Gnd<\/td><\/tr><tr><td>6<\/td><td>&nbsp;<\/td><\/tr><tr><td>7<\/td><td>&nbsp;<\/td><\/tr><tr><td>8 CTS<\/td><td>4 DTR<\/td><\/tr><tr><td>9<\/td><td>&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The SPLat cannot controls the RTS pin of a modem.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">Built in multi-drop capability<\/h6>\n\n\n\n<p>The interface has a special design that allows several boards&#8217; interfaces to be connected in parallel, like pin to like pin. This makes possible small systems of up to 5 boards in a multi-drop communications configuration, connected perhaps to a shared modem. Please contact SPLat Controls for information about suitable&nbsp;<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/glossary-of-terms\/#o370\">Firmware<\/a>&nbsp;to support this arrangement.<\/p>\n\n\n\n<p>See also&nbsp;<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/serial-communications\/rs232-pinouts-a-primer\/\">RS232 pinouts: A primer<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The comms connector is a standard DB9. It provides an RS232 compatible interface. It is used for communications with a PC for programming and use&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1422,"menu_order":18,"template":"","class_list":["post-1477","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: Comms connector - 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: Comms connector - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"The comms connector is a standard DB9. It provides an RS232 compatible interface. 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