This 8-channel latching relay module (C) is controlled via RS-485 and uses the Modbus RTU protocol. It features latching relays, meaning the relay states are retained even after power loss - ideal for applications where maintaining output state during outages is important. Housed in a DIN rail-mount ABS enclosure, it's built for quick installation in control cabinets or industrial setups. Each relay is rated for up to 10A at 250VAC or 30VDC. A dedicated driver chip provides reliable switching, and the flash-on/flash-off function allows relays to activate briefly and then return to their previous state, based on command parameters. The module supports configurable device addresses from 1 to 255 and can be cascaded with multiple units over the RS-485 bus (for longer distances or larger setups, RS-485 repeaters may be needed). Built-in protection includes unibody power and magnetic isolation, TVS diodes, and a resettable fuse. These help protect against surges, interference, and incorrect wiring. A reverse-proof circuit prevents damage from accidental polarity errors. Three onboard LEDs indicate MCU operation and RS-485 signal transmission. Note: Power adapter not included (12V DC Barrel Jack supply recommended). ⚠️Electrical Safety Precautions⚠️ * This product should be operated and used by professional electricians or technical personnel. During use, please ensure electrical safety and take protective measures such as anti-leakage and insulation. * Before installing, maintaining, or replacing relay equipment, make sure to turn off the power and unplug the device. * Do not attempt to dismantle relay equipment to avoid damaging the device or risking electric shock. * Please properly install and place the relay equipment. Avoid using it in damp, overly hot, or flammable environments to prevent safety accidents due to improper installation or use. Features * Latching relay retains state after power loss * Configurable device address (1–255); supports cascading on RS-485 bus * Flash-on/flash-off relay control with timing via command * Integrated power supply isolation; no separate supply needed for isolated terminal * Magnetic signal isolation for high reliability and low interference * Resettable fuse and TVS diode for surge, overcurrent, and electrostatic protection * Dedicated latching relay driver chip for stable switching * Reverse-polarity protection circuit * Relay contact rating: ≤10A at 250VAC or 30VDC * DIN rail-mount ABS enclosure * Three LEDs for MCU and RS-485 status indication Specifications Power Supply DC 7~36V Communication Interface RS-485 Communication Baudrate 4800, 9600, 19200, 38400, 57600, 115200, 128000, 256000 Default Communication Format 9600, N, 8, 1 Relay Channels 8 Channels Relay Type Magnetic latching relay Contact Form 1NO 1NC Contact Load ≤10A 250V AC or ≤10A 28V DC Modbus Protocol Standard Modbus RTU protocol RS-485 Address Setting 1~255 Indicator STA: MCU indicator, keeps flashing when MCU is operating normally TXD: Transmit Data indicator, lights up when transmitting data RXD: Receive Data indicator, lights up when receiving data Resources * Product Wiki Package Contents * 1x 8-Channel Modbus RTU Latching Relay Module (C) with RS-485 Interface Power supply not included. https://elecena.pl/product/28997807/8-channel-modbus-rtu-latching-relay-module-c-with-rs-485-interface 2025-06-27 https://elecena.pl/product/28997807/8-channel-modbus-rtu-latching-relay-module-c-with-rs-485-interface 2025-11-29