{"id":71489,"date":"2019-08-03T14:58:53","date_gmt":"2019-08-03T12:58:53","guid":{"rendered":"https:\/\/raspberrypi.dk\/produkt\/rs485-can-hat-for-raspberry-pi\/"},"modified":"2026-02-10T14:50:00","modified_gmt":"2026-02-10T13:50:00","slug":"rs485-can-hat-for-raspberry-pi","status":"publish","type":"product","link":"https:\/\/raspberrypi.dk\/en\/product\/rs485-can-hat-for-raspberry-pi\/","title":{"rendered":"2-Channel RS485 HAT for Raspberry Pi"},"content":{"rendered":"<h2>Overview<\/h2>\n<p>This is a 2-channel isolated RS485 expansion HAT designed for Raspberry Pi, adopts the SC16IS752+SP3485 solution, with embedded protection circuits such as power supply isolation, ADI magnetical isolation, and TVS diode, etc.<\/p>\n<p>It is easy to control the 2-channel RS485 for auto transceiving via SPI interface. Due to its fast communication, stability, reliability, and safety,\u00a0it is an ideal choice for fields like industrial automation.<\/p>\n<h2>Features<\/h2>\n<ul>\n<li>Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards<\/li>\n<li>Adopts SC16IS752+SP3485 dual chip combination, converts SPI to RS485, data rate up to 921600bps<\/li>\n<li>Allows transceiving data manually or automatically, configured by DIP switch<\/li>\n<li>Onboard TVS (Transient Voltage Suppressor), effectively suppress surge voltage and transient spike voltage in the circuit, lightningproof &amp; anti-electrostatic<\/li>\n<li>Onboard auto-recovery fuse and protection diodes, ensures the current\/voltage stable outputs, provides over-current\/over-voltage proof, improves shock resistance<\/li>\n<li>Onboard LEDs for indicating the power and transceiver status<\/li>\n<li>Breakout SPI control pins, for connecting with host control boards like Arduino<\/li>\n<li>Comes with development resources and manual (examples in C and Python)<\/li>\n<\/ul>\n<h2>Specifications<\/h2>\n<ul>\n<li>UART expansion chip: SC16IS752<\/li>\n<li>RS485 transceiver: SP3485<\/li>\n<li>Communication interface: SPI<\/li>\n<li>Data rate: 300 ~ 921600 bps<\/li>\n<li>Operating voltage: 3.3V \/ 5V<\/li>\n<li>Dimensions: 65mm \u00d7 56.5mm<\/li>\n<li>Mounting hole size: 3.0mm<\/li>\n<\/ul>\n<h2>What&#8217;s on Board<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/2-CH-RS485-HAT\/2-CH-RS485-HAT-intro.jpg\" alt=\"2-CH RS485 HAT on board resource\" \/><\/p>\n<ol>\n<li><strong>SC16IS752 UART expansion chip<\/strong><\/li>\n<li><strong>ADUM1412 digital isolator<\/strong><\/li>\n<li><strong>PC817 optocoupler<\/strong><\/li>\n<li><strong>SP3485 RS485 transceiver<\/strong><\/li>\n<li><strong>B0505LS power supply isolation module<\/strong><\/li>\n<li><strong>RT9193-33 power chip<\/strong><\/li>\n<li><strong>SMAJ12CA transient suppress diode array<\/strong><\/li>\n<li><strong>Auto-recovery fuse<\/strong><\/li>\n<li><strong>Status indicator<\/strong><br \/>\nPWR: power indicator<br \/>\nRXD\/TXD: UART transceiving indicator<\/li>\n<li><strong>Raspberry Pi GPIO connector:<\/strong>\u00a0for connecting Raspberry Pi<\/li>\n<li><strong>RS485 terminal<\/strong><\/li>\n<li><strong>MCU control header:<\/strong>\u00a0for connecting host control boards like Arduino<\/li>\n<li><strong>120\u03a9 terminal resistor switch<\/strong><\/li>\n<li><strong>Interrupt pin switch<\/strong><\/li>\n<li><strong>Operating mode selection<\/strong><br \/>\nHalf-auto: A=0, B=1<br \/>\nFull-auto: A=1, B=0<\/li>\n<\/ol>\n<h2>Example<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/2-CH-RS485-HAT\/2-CH-RS485-HAT-5_800.jpg\" \/><\/p>\n<h2>Pinouts<\/h2>\n<table class=\"tabSty-1\">\n<tbody>\n<tr>\n<th>PIN<\/th>\n<th>RASPBERRY PI (BCM)<\/th>\n<th>DESCRIPTION<\/th>\n<\/tr>\n<tr>\n<td>VCC<\/td>\n<td>5V<\/td>\n<td>3.3V\/5V power supply<\/td>\n<\/tr>\n<tr>\n<td>GND<\/td>\n<td>GND<\/td>\n<td>Ground<\/td>\n<\/tr>\n<tr>\n<td>SCK<\/td>\n<td>P21 (SPI1 SCLK)<\/td>\n<td>SPI clock input<\/td>\n<\/tr>\n<tr>\n<td>MOSI<\/td>\n<td>P20 (SPI1 MOSI)<\/td>\n<td>SPI data input<\/td>\n<\/tr>\n<tr>\n<td>MISO<\/td>\n<td>P19 (SPI1 MISO)<\/td>\n<td>SPI data output<\/td>\n<\/tr>\n<tr>\n<td>CS<\/td>\n<td>P18 (SPI1 CS)<\/td>\n<td>SPI chip select<\/td>\n<\/tr>\n<tr>\n<td>IRQ<\/td>\n<td>P24<\/td>\n<td>Interrupt output<\/td>\n<\/tr>\n<tr>\n<td>EN1<\/td>\n<td>P27<\/td>\n<td>Channel 1 TX\/RX enable: high for TX, low for RX<\/td>\n<\/tr>\n<tr>\n<td>EN2<\/td>\n<td>P22<\/td>\n<td>Channel 2 TX\/RX enable: high for TX, low for RX<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Dimension<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.waveshare.com\/img\/devkit\/accBoard\/2-CH-RS485-HAT\/2-CH-RS485-HAT-size.jpg\" \/><\/p>\n<h2>Development Resources<\/h2>\n<p><strong>Wiki :\u00a0<\/strong><a href=\"http:\/\/www.waveshare.com\/wiki\/2-CH_RS485_HAT\" target=\"_blank\" rel=\"noopener\">www.waveshare.com\/wiki\/2-CH_RS485_HAT<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<div class=\"overviewSec subHead\">2-Channel Isolated RS485 Expansion HAT For Raspberry Pi, SC16IS752+SP3485 Solution, With Multi Onboard Protection Circuits.<\/div>\n","protected":false},"featured_media":138232,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[612,459],"product_tag":[716,702],"class_list":{"0":"post-71489","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-industrial-raspberry-pi","7":"product_cat-raspberry-pi-hats-gpio-en","8":"product_tag-rpi4-en","9":"product_tag-rpi5-en","11":"first","12":"outofstock","13":"taxable","14":"shipping-taxable","15":"purchasable","16":"product-type-simple"},"composite_virtual":false,"composite_layout":"","composite_add_to_cart_form_location":"","composite_editable_in_cart":false,"composite_sold_individually_context":"","composite_shop_price_calc":"","composite_components":[],"composite_scenarios":[],"bundled_by":[],"bundle_stock_status":"outofstock","bundle_stock_quantity":0,"bundle_virtual":false,"bundle_layout":"","bundle_add_to_cart_form_location":"","bundle_editable_in_cart":false,"bundle_sold_individually_context":"","bundle_item_grouping":"","bundle_min_size":"","bundle_max_size":"","bundle_price":[],"bundled_items":[],"bundle_sell_ids":[],"yoast_head":"<!-- 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