Serial Relay RS485 Remote Control Switch Smart Home 2DO 4DI Modbus RTU Protocol

Serial Relay Switch 1 Channel RS485 Interface Modbus RTU Protocol Smart Home

Waveshare Modbus Rtu Relay (B) RS485 7-36V

PLC Display LED Serial Port Meter Communication 4‑Digit DC For MODBUS‑RTU RS485

RS485 Serial Relay Industry Remote Control Switch 4DO 4DI Modbus RTU Protocol

RS485 0~1/2/5A 0-30V Current Voltage Collector Signal Acquisition MODBUS RTU

RS485 Serial Relay 6 Channel Intelligent Industry Remote Control Switch

DC12V 16Channel RS485 Relay Module Modbus RTU Expaning Board DIN Rail Board DIY