【RS485 32-ch Relay Module】Industrial 32-ch relay module controlled via RS485 bus, adopts Modbus RTU protocol, supports 7~36V wide voltage power supply, rail-mounted ABS case design, easy to install, safe to use 【RS485 Communication】Configurable device address (1~255), multi devices can be cascaded on RS485 bus, in case of many devices are cascaded, or the communication distance is quite long, it is necessary to use RS485 repeaters 【Relay connection】Contact rating of the onboard relay up to 10A 250VAC/30VDC, directly controlling 220VAC home appliances, or devices below 30VDC. Features flash-on, flash-off function, it is possible to turn on the relay for a while and then close it automatically via the command 【Multiple protections】built-in protection circuits such as power supply isolation, ADI magnetical isolation, resettable fuse, TVS diode, optocoupler isolation, relay driver chip and reverse-proof circuit etc. 【LED Indicators】3 LEDs for indicating the MCU status and signal transceiving status