Welcome to my quick review of an inexpensive 2-channel 5V relay module controlled via RS485 bus utilizing Modbus RTU protocol. As claimed by some online sellers, this easy-to-get Modbus RTU 2-Channel ...

Capable of operating to 100 million cycles at maximum voltage, the mini SIP Reed Relay P/N S1A has an even higher life expectancy at low signal levels. Measuring just 0.79" x 0.30" x 0.20", pinout ...