The 1 Channel Modbus relay module is equipped with mature and stable 8-bit MCU and RS485 level communication chips. RS485 communication protocol using standard MODBUS RTU format can realize 1-way input signal detection and 1-way relay output, which can be used in digital quantity detection or power control occasions. Device address: range 1-255, default 255, support power-down saving Baud rate, input signal, relay status, equipment address can be read using software/instructions Onboard relay switch indicator