Waveshare Modbus RTU Protocol 8-Ch Latching Relay Module (C) With RS485 Interface(30460)Features: 1. Support setting device address (1 255) to cascade multiple devices through RS485 bus 2. With flash on and flash off functions, the relay can be controlled by command to automatically close after being turned on for a period of time 3. Onboard integrated power isolation can provide stable isolation voltage, and the isolation end does not need additional power supply 4. Onboard integrated magnetic coupling isolation can be used for signal