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
