{"product_id":"max3485-ttl-rs485-module-3v3","title":"MAX3485 TTL to RS485 Auto Direction Module - 3.3V","description":"\u003cdiv class=\"nznpd\"\u003e\n\u003cdiv class=\"nznpd__lead\"\u003e\n\u003cp class=\"nznpd__intro\"\u003eConnect a 3.3V microcontroller UART to a two-wire RS485 bus with this MAX3485 module. It runs from 3.3V, so it wires straight to an ESP32, Raspberry Pi Pico or other 3.3V board, and an onboard circuit switches between transmit and receive for you, so no direction-control pin is needed. Using a 5V board such as an Arduino Uno? Choose our \u003ca href=\"\/products\/max13487-ttl-rs485-autodirection-module\"\u003eMAX13487 5V RS485 module\u003c\/a\u003e instead.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003ch3 class=\"nznpd__h\"\u003eSpecifications\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__specs\"\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eBoard marking\u003c\/span\u003e\u003cstrong\u003eHW-144\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eTransceiver\u003c\/span\u003e\u003cstrong\u003eMAX3485\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eModule supply\u003c\/span\u003e\u003cstrong\u003e3.3V DC (3.0 to 3.6V)\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eLogic level\u003c\/span\u003e\u003cstrong\u003e3.3V UART\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eTTL interface\u003c\/span\u003e\u003cstrong\u003eVCC, TXD, RXD, GND\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eRS485 interface\u003c\/span\u003e\u003cstrong\u003eD+\/A, D-\/B, GND\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eBus mode\u003c\/span\u003e\u003cstrong\u003eTwo-wire half duplex\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eDirection control\u003c\/span\u003e\u003cstrong\u003eAutomatic\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eBus loading\u003c\/span\u003e\u003cstrong\u003e1 unit load, up to 32 nodes\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eStatus LEDs\u003c\/span\u003e\u003cstrong\u003ePower, TXD and RXD\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eTermination\u003c\/span\u003e\u003cstrong\u003e120 ohm via 120_S bridge\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"nznpd__spec\"\u003e\n\u003cspan\u003eBoard size\u003c\/span\u003e\u003cstrong\u003eAbout 54 x 22 mm\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003ch3 class=\"nznpd__h\"\u003eDatasheets\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__ds\"\u003e\n\u003ca class=\"nznpd__dsbar\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0664\/6127\/0112\/files\/MAX3485-TTL-RS485-Module-3V3-Datasheet-v2.pdf\" target=\"_blank\" rel=\"noopener\" aria-label=\"Download the MAX3485 TTL to RS485 3.3V module datasheet (PDF)\"\u003e\n\u003csvg width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpath d=\"M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z\"\u003e\u003c\/path\u003e\u003cpolyline points=\"14 2 14 8 20 8\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\n\u003cspan\u003eFull technical datasheet\u003c\/span\u003e\n\u003cspan class=\"nznpd__dsmeta\"\u003ePDF\u003csvg width=\"17\" height=\"17\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003cpath d=\"M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4\"\u003e\u003c\/path\u003e\u003cpolyline points=\"7 10 12 15 17 10\"\u003e\u003c\/polyline\u003e\u003cline x1=\"12\" y1=\"15\" x2=\"12\" y2=\"3\"\u003e\u003c\/line\u003e\u003c\/svg\u003e\u003c\/span\u003e\n\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003ch3 class=\"nznpd__h\"\u003eWhat's in the box\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__included\"\u003e\n\u003cdiv class=\"nznpd__qty\"\u003e1×\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eMAX3485 TTL to RS485 module\u003c\/strong\u003e\u003cp\u003eRed HW-144 board with a fitted right-angle 4-pin header and a green 3-way screw terminal.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003ch3 class=\"nznpd__h\"\u003eGreat for\u003c\/h3\u003e\n\u003cdiv class=\"nznpd__uses\"\u003e\n\u003cdiv class=\"nznpd__use\"\u003eReading a Modbus RTU energy meter from an ESP32\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eLinking two Raspberry Pi Picos over a long cable\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003ePolling RS485 sensors from a 3.3V controller\u003c\/div\u003e\n\u003cdiv class=\"nznpd__use\"\u003eTalking to a VFD or PLC serial port\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003csection class=\"nznpd__block\"\u003e\n\u003cdiv class=\"nznpd__qs\"\u003e\n\u003ch3\u003eWiring \u0026amp; getting started\u003c\/h3\u003e\n\u003col class=\"nznpd__steps\"\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect power with the circuit off\u003c\/strong\u003e\u003cp\u003eConnect a regulated 3.3V supply to VCC and join the controller and module grounds. Do not power it from 5V.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect the UART\u003c\/strong\u003e\u003cp\u003eConnect controller TX to TXD and controller RX to RXD. The module switches between sending and receiving by itself.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect the RS485 bus\u003c\/strong\u003e\u003cp\u003eConnect D+\/A to the remote A or + terminal and D-\/B to the remote B or - terminal. Keep the polarity the same along the whole bus.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eSet termination and start slow\u003c\/strong\u003e\u003cp\u003eBridge 120_S only when this module is at a physical end of the cable. Start at 9600 baud and raise the speed once replies are reliable.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n","brand":"NZN Electronics","offers":[{"title":"Default Title","offer_id":67589424906336,"sku":"MOD-MAX3485-RS485","price":4.49,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0664\/6127\/0112\/files\/max3485-ttl-rs485-module-3v3-hero.png?v=1790851556","url":"https:\/\/www.nznelectronics.co.nz\/products\/max3485-ttl-rs485-module-3v3","provider":"NZN Electronics","version":"1.0","type":"link"}