{"id":7317,"date":"2023-05-12T09:50:56","date_gmt":"2023-05-12T07:50:56","guid":{"rendered":"https:\/\/wp.delphin.de\/?post_type=glossar&#038;p=7317"},"modified":"2026-06-24T12:20:51","modified_gmt":"2026-06-24T10:20:51","slug":"external-bus-2","status":"publish","type":"glossar","link":"https:\/\/www.delphin.de\/en\/glossar\/externer-bus\/","title":{"rendered":"External bus"},"content":{"rendered":"<p class=\"wp-block-paragraph\">The <strong>External Bus<\/strong> is a specialized communication interface within the Delphin Message Series and is used to connect expansion devices to Delphin base units. This interface allows additional measurement and input\/output modules to be easily integrated into an existing data acquisition system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Technically, the External Bus is based on the proven <strong>CAN Bus Technology (Controller Area Network)<\/strong>. For communication, Delphin uses its own <strong>Delphin <a href=\"https:\/\/www.delphin.de\/en\/glossary\/dcp\/\" data-type=\"glossar\" data-id=\"6773\">CAN Protocol <\/a>(DCP)<\/strong>, which was specifically designed for reliable data transmission between Delphin devices.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, the external bus can be used to <strong>ProfiMessage Slave Devices<\/strong> with Delphin base units such as <a href=\"https:\/\/www.delphin.de\/en\/products\/measuring-testing-devices\/modular-data-acquisition-profimessage-d\/\" data-type=\"produkt\" data-id=\"1257\"><strong>ProfiMessage D<\/strong> <\/a>connect. This allows a measurement system to be flexibly expanded when additional measurement channels, inputs, or outputs are needed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A particular advantage is that multiple expansion units can be operated in series within a bus structure. This so-called series connection enables the modular expansion of a system without the need for extensive rewiring or additional communication interfaces.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To ensure trouble-free data transmission, the bus must be properly terminated. To do this, a <strong>Terminating resistor with 120 ohms<\/strong> installed. This prevents signal reflections on the line and ensures reliable communication between all connected devices.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Typical functions of the external bus:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Connecting ProfiMessage Expansion Devices<\/li>\n\n\n\n<li>Increasing the Number of Channels in a Measurement System<\/li>\n\n\n\n<li>Transmission of Measurement Values and Status Information<\/li>\n\n\n\n<li>Communication between the base unit and expansion modules<\/li>\n\n\n\n<li>Design of Modular Data Acquisition Systems<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Advantages of the External Bus:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Easy Expansion of Existing Delphin Systems<\/li>\n\n\n\n<li>Reliable Communication Based on CAN Technology<\/li>\n\n\n\n<li>Support for multiple expansion modules on a single bus line<\/li>\n\n\n\n<li>High immunity to interference in industrial environments<\/li>\n\n\n\n<li>Minimal wiring required<\/li>\n\n\n\n<li>Flexible adaptation to growing measurement tasks<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The external bus thus enables the modular design of high-performance measurement and data acquisition systems and ensures reliable communication between Delphin base units and expansion modules.<\/p>","protected":false},"featured_media":0,"template":"","class_list":["post-7317","glossar","type-glossar","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/glossar\/7317","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/glossar"}],"about":[{"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/types\/glossar"}],"wp:attachment":[{"href":"https:\/\/www.delphin.de\/en\/wp-json\/wp\/v2\/media?parent=7317"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}