Modbus-Rtu 2-way Relay Module Output 2 Channel Switch Input TTL/RS485 Interface Communication

Modbus RTU instruction: http://img.banggood.com/file/products/20181018043936Modbus-RTU-instruction.docx Hardware resources: 1. RS485 communication interface 2. TTL communication interface 3. 2 channel optocoupler isolation input 4. 2 channel optocoupler isolation output 5. A user button 6. A user LED indicator 7. A power indicator 8. A STM32F030F4 microcontroller 9. 2 relay status indicator LED lights 10. Power terminal interface (12V power supply) Package includes: 1 x Modbus-Rtu 2-way Relay