{"id":6617,"date":"2022-06-30T13:00:31","date_gmt":"2022-06-30T05:00:31","guid":{"rendered":"https:\/\/store.west-hn.com\/?p=6617"},"modified":"2022-07-15T11:44:26","modified_gmt":"2022-07-15T03:44:26","slug":"iot-communication-interface-rs422","status":"publish","type":"post","link":"https:\/\/store.west-hn.com\/en\/iot-communication-interface-rs422\/","title":{"rendered":"[IOT Communication Interface]--RS-422"},"content":{"rendered":"<h2 class=\"wp-block-heading\">summarize<\/h2><p>RS-422 (EIA RS-422-A Standard) is a standard for Apple's Macintosh computers.<a href=\"https:\/\/store.west-hn.com\/iot-communication-interface-serial-communication\/\" target=\"_blank\" rel=\"noreferrer noopener\">Serial Connection Standard<\/a> The full name is \"Balanced Voltage Digital Interface Circuit\" and its electrical characteristics: RS-422 uses differential signals (balanced transmission).<a href=\"https:\/\/store.west-hn.com\/iot-serial-communications-protocols-rs-485\/\">RS-232<\/a>Signals using an unbalanced reference ground. Differential transmission uses two wires to send and receive signals, which provides better noise immunity and longer transmission distances than RS-232. Better noise immunity and longer transmission distances are a big advantage in industrial environments.<\/p><figure class=\"wp-block-image size-full is-style-default\"><img loading=\"lazy\" decoding=\"async\" width=\"887\" height=\"399\" src=\"https:\/\/store.west-hn.com\/wp-content\/uploads\/2022\/06\/RS422-4-wire.jpg\" alt=\"RS-422\u94fe\u63a5\u65b9\u5f0f\" class=\"wp-image-6684\" title=\"RS-422 4-wire connection\" srcset=\"https:\/\/store.west-hn.com\/wp-content\/uploads\/2022\/06\/RS422-4-wire.jpg 887w, https:\/\/store.west-hn.com\/wp-content\/uploads\/2022\/06\/RS422-4-wire-768x345.jpg 768w, https:\/\/store.west-hn.com\/wp-content\/uploads\/2022\/06\/RS422-4-wire-600x270.jpg 600w\" sizes=\"auto, (max-width: 887px) 100vw, 887px\" \/><\/figure><p>RS-422 has been improved to produce a<a href=\"https:\/\/store.west-hn.com\/iot-communication-interface-rs485\/\">RS-485<\/a>(EIA-485 standard), RS-485 increases the number of devices from 10 to 32 and defines the electrical characteristics at the maximum number of devices to ensure sufficient signal voltage.<\/p><h2 class=\"wp-block-heading\">Features of RS-422<\/h2><ul class=\"wp-block-list\"><li>The maximum transmission rate of RS-422 is 10Mb\/s, and the maximum transmission rate of 100 meters of twisted-pair cable is 1Mb\/s (the length of its balanced twisted-pair cable is inversely proportional to the transmission rate).<\/li><li>Maximum transmission distance is 1200 meters (400 feet), but requires a relatively low transmission rate<\/li><li>Point-to-multipoint full-duplex bidirectional communication with one master and multiple slaves<\/li><li>Includes master device, maximum number of nodes is 10<\/li><li>Long-distance transmission requires a matching resistor of 100 ohms at the farthest end of the cable (related to the characteristic impedance of the transmission cable); if the distance is less than 300 meters, the matching resistor can be left out.<\/li><\/ul><h2 class=\"wp-block-heading\">RS-422 Interface Definition<\/h2><p>From the figure below, RS-422 as well as RS-485 data are transmitted using differential transmission, also known as balanced transmission, using a pair of twisted-pair wires (4 wires).RS-422 is used less nowadays due to the fact that it is easy to make a mistake by using 4 wires, so most of them use RS-485 instead.<\/p><figure class=\"wp-block-image size-full is-resized is-style-default\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/store.west-hn.com\/wp-content\/uploads\/2022\/06\/RS233-RS485-RS422.jpg\" alt=\"\u4e32\u53e3\u63a5\u53e3\u793a\u610f\u56fe\" class=\"wp-image-6691\" width=\"840\" height=\"493\" title=\"Schematic diagrams of the 3 types of serial interfaces\" srcset=\"https:\/\/store.west-hn.com\/wp-content\/uploads\/2022\/06\/RS233-RS485-RS422.jpg 954w, https:\/\/store.west-hn.com\/wp-content\/uploads\/2022\/06\/RS233-RS485-RS422-768x451.jpg 768w, https:\/\/store.west-hn.com\/wp-content\/uploads\/2022\/06\/RS233-RS485-RS422-600x352.jpg 600w\" sizes=\"auto, (max-width: 840px) 100vw, 840px\" \/><\/figure><h2 class=\"wp-block-heading\">Comparison of three serial interfaces<\/h2><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><figure id=\"\u4e32\u53e3\u6bd4\u8f83\u8868\u683c\" class=\"wp-block-table is-style-regular\"><table><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\"><strong>sports event<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>RS-232<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>RS-422<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>RS-485<\/strong><\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">transmission method<\/td><td class=\"has-text-align-center\" data-align=\"center\">single-ended<\/td><td class=\"has-text-align-center\" data-align=\"center\">increment<\/td><td class=\"has-text-align-center\" data-align=\"center\">increment<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Number of nodes<\/td><td class=\"has-text-align-center\" data-align=\"center\">1 receive, 1 transmit<\/td><td class=\"has-text-align-center\" data-align=\"center\">1 send, 10 receive<\/td><td class=\"has-text-align-center\" data-align=\"center\">1 send, 32 receive<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Maximum transmission distance<\/td><td class=\"has-text-align-center\" data-align=\"center\">15 meters<\/td><td class=\"has-text-align-center\" data-align=\"center\">1200 meters<\/td><td class=\"has-text-align-center\" data-align=\"center\">1200 meters<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Maximum transmission rate<\/td><td class=\"has-text-align-center\" data-align=\"center\">200kb\/s<\/td><td class=\"has-text-align-center\" data-align=\"center\">10Mb\/s<\/td><td class=\"has-text-align-center\" data-align=\"center\">10Mb\/s<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Maximum Drive Output Voltage<\/td><td class=\"has-text-align-center\" data-align=\"center\">+\/- 25V<\/td><td class=\"has-text-align-center\" data-align=\"center\">-0.25V-+6V<\/td><td class=\"has-text-align-center\" data-align=\"center\">-7V-+12V<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Output Signal Level (min. with load)<\/td><td class=\"has-text-align-center\" data-align=\"center\">+\/- 5V-+\/- 15V<\/td><td class=\"has-text-align-center\" data-align=\"center\">+\/- 2.0V<\/td><td class=\"has-text-align-center\" data-align=\"center\">+\/- 1.5V<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Output signal level (no load max.)<\/td><td class=\"has-text-align-center\" data-align=\"center\">+\/- 25V<\/td><td class=\"has-text-align-center\" data-align=\"center\">+\/- 6V<\/td><td class=\"has-text-align-center\" data-align=\"center\">+\/- 6V<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Driver Load Impedance<\/td><td class=\"has-text-align-center\" data-align=\"center\">3K\u03a9-7K\u03a9<\/td><td class=\"has-text-align-center\" data-align=\"center\">100\u03a9<\/td><td class=\"has-text-align-center\" data-align=\"center\">54\u03a9\/120\u03a9<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Oscillation rate (maximum)<\/td><td class=\"has-text-align-center\" data-align=\"center\">30V\/us<\/td><td class=\"has-text-align-center\" data-align=\"center\">inapplicable<\/td><td class=\"has-text-align-center\" data-align=\"center\">inapplicable<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Receiver Input Voltage Range<\/td><td class=\"has-text-align-center\" data-align=\"center\">+\/- 15V<\/td><td class=\"has-text-align-center\" data-align=\"center\">-10V-+10V<\/td><td class=\"has-text-align-center\" data-align=\"center\">-7V-+12V<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Receiver Input Threshold<\/td><td class=\"has-text-align-center\" data-align=\"center\">+\/- 3V<\/td><td class=\"has-text-align-center\" data-align=\"center\">+\/- 200mV<\/td><td class=\"has-text-align-center\" data-align=\"center\">+\/- 200mV<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Receiver Input Impedance<\/td><td class=\"has-text-align-center\" data-align=\"center\">2K\u03a9-7K\u03a9<\/td><td class=\"has-text-align-center\" data-align=\"center\">4K\u03a9<\/td><td class=\"has-text-align-center\" data-align=\"center\">&gt;=12K\u03a9<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Driver Common Mode Voltage<\/td><td class=\"has-text-align-center\" data-align=\"center\">inapplicable<\/td><td class=\"has-text-align-center\" data-align=\"center\">-3V-+3V<\/td><td class=\"has-text-align-center\" data-align=\"center\">-1V-+3V<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\">Receiver Common Mode Voltage<\/td><td class=\"has-text-align-center\" data-align=\"center\">inapplicable<\/td><td class=\"has-text-align-center\" data-align=\"center\">-7V-+7V<\/td><td class=\"has-text-align-center\" data-align=\"center\">-7V-+12V<\/td><\/tr><\/tbody><\/table><\/figure><\/div><h2 class=\"wp-block-heading\">World Power Technology Related Products<\/h2>\t\n  \n    <div class=\"row large-columns-4 medium-columns-3 small-columns-2 row-small has-shadow row-box-shadow-2-hover slider row-slider slider-nav-reveal slider-nav-push\"  data-flickity-options='{&quot;imagesLoaded&quot;: true, &quot;groupCells&quot;: &quot;100%&quot;, &quot;dragThreshold&quot; : 5, &quot;cellAlign&quot;: &quot;left&quot;,&quot;wrapAround&quot;: true,&quot;prevNextButtons&quot;: true,&quot;percentPosition&quot;: true,&quot;pageDots&quot;: false, &quot;rightToLeft&quot;: false, &quot;autoPlay&quot; : false}' >\n\n  \n\t     <div class=\"product-small col has-hover product type-product post-1676 status-publish first instock product_cat-serial-server product_tag-rs232 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