{"title":"Modbus RTU 16-Ch Relay Module, RS485 Interface, With Multiple Isolation Protection Circuits","handle":"modbus-rtu-16-ch-relay-module-rs485-interface-with-multiple-isolation-protection-circuits","url":"/products/modbus-rtu-16-ch-relay-module-rs485-interface-with-multiple-isolation-protection-circuits","description":"An industrial-grade 16-channel relay module controlled via RS485 bus using the Modbus RTU protocol. Built-in isolation protection circuits — including power supply isolation, ADI magnetic isolation, optocoupler isolation, resettable fuse, and TVS diode — ensure safe, stable, and reliable operation. Housed in a rail-mounted ABS enclosure for easy DIN rail installation.\n\nEach relay channel supports flash-on and flash-off functions, allowing timed activation that automatically switches off after a set duration. Device addresses are configurable from 1–255, enabling multiple modules to be cascaded on a single RS485 bus.\n\nKey Features\n\n\n16 Relay Channels – Contact rating up to 10A 250VAC / 30VDC per channel\n\nModbus RTU Protocol – Standard industrial communication via RS485\n\nMultiple Isolation Protection – Power supply isolation, ADI magnetic isolation, optocoupler isolation, resettable fuse, and TVS diode\n\nCascadable – Configurable device address (1–255) for multi-device RS485 bus setups\n\nFlash-On / Flash-Off – Timed relay activation with automatic shut-off\n\nReverse Polarity Protection – Prevents damage from incorrect wiring\n\nDedicated Relay Driver – Built-in freewheeling diode protection for stable driving\n\nRail-Mounted ABS Case – DIN rail compatible, safe and easy to install\n\nStatus LEDs – 3 LEDs indicate MCU status and signal transceiving\n\n\nSpecifications\n\n\nPower Supply – 5V (included)\n\nPower Consumption – 0.26W standby, 4.7W with all relays active\n\nInterface – RS485\n\nProtocol – Modbus RTU (function codes 01, 03, 05, 06, 0F)\n\nDefault Baud Rate – 9600 (supports 4800–256000)\n\nParity – None, even, or odd (configurable)\n\nRelay Rating – ≤10A 250VAC / 30VDC\n\n\nIdeal For\n\nIndustrial automation and control systems\nHome automation with 220–240VAC appliance switching\nMulti-device RS485 networked relay control\nApplications requiring high communication reliability\n\n\nPackage Contents\n\n1× Modbus RTU 16-Ch Relay Module\n1× 5V 2A Power Supply (US plug with EU adapter)\n\n\n\nNote: The included power supply has a US plug with an EU adapter. Australian customers may need a separate plug adapter. A USB-to-RS485 converter (not included) is required for PC-based testing and configuration.\n\n\nResources\n\nProduct Wiki – Documentation, demo code, and protocol reference\n","vendor":"Waveshare","product_type":"","in_stock":true,"options":[],"variants":[{"id":1442,"title":"Default Title","sku":"WS-24921","price":69.57,"on_sale":false,"in_stock":true,"available_quantity":12,"option1":"Default Title"}]}