{"title":"Dual-channel RS485 Expansion Hat for Raspberry Pi 4B","handle":"dual-channel-rs485-expansion-hat-for-raspberry-pi-4b","url":"/products/dual-channel-rs485-expansion-hat-for-raspberry-pi-4b","description":"A dual-channel RS485 expansion HAT for Raspberry Pi that provides electrically isolated RS485 communication with built-in protection against lightning, surges, and transient voltage spikes. Each channel uses an isolated transceiver for reliable, interference-resistant data transmission — ideal for industrial IoT, environmental monitoring, and building automation systems.\n\nThe HAT uses the CH432T serial chip and TP75176E RS485 transceivers, with 120Ω terminal resistors and 5.08-3P pluggable terminal blocks for easy wiring. TX and RX indicator LEDs show communication activity in real time. Includes mounting hardware for secure attachment to your Raspberry Pi.\n\nKey Features\n\n\nDual RS485 Channels – Two independent, isolated RS485 communication interfaces\n\nElectrical & Signal Isolation – Isolated transceivers for reliable, noise-resistant data transfer\n\nLightning & Surge Protection – Built-in protection circuits including TVS diode\n\nTX/RX Indicator LEDs – Blue (TX) and green (RX) for real-time communication status\n\n120Ω Terminal Resistors – Included on each channel for proper bus termination\n\nPluggable Terminal Blocks – 5.08-3P connectors for tool-free wiring\n\nModbus Ready – Supports Modbus master/slave protocol over RS485\n\n\nIdeal For\n\nAgricultural and warehouse IoT systems\nIndoor and outdoor environmental monitoring\nLighting control and building automation\nSecurity and access control systems\nIndustrial sensor networks using Modbus protocol\n\n\nSpecifications\n\n\nOperating Voltage – 3.3V\n\nRS485 Transceiver – TP75176E\n\nSerial Chip – CH432T\n\nRS485 Channels – 2\n\nTerminal Resistance – 2× 120Ω\n\nWiring – 5.08-3P pluggable terminal blocks\n\nLEDs – Power (red), TX (blue), RX (green)\n\nCompatibility – Raspberry Pi 3B+, 4B\n\nMounting Holes – 2.5mm diameter\n\nDimensions – 56 × 65mm\n\n\nPackage Contents\n\n1× Dual-Channel RS485 Expansion HAT\n4× Copper Standoffs & Screws\n\n\nResources\n\nProduct Wiki\nSchematic (PDF)\nTP75176E Datasheet (PDF)\nDesign Document\nCAD File\n3D Model File\n","vendor":"DFRobot","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":1614,"title":"Default Title","sku":"DF-DFR0824","price":49.09,"on_sale":false,"in_stock":true,"available_quantity":103,"option1":"Default Title"}]}