RE-2104 can be used as a standalone local server, RS485 to Ethernet communication converter, communication buffer, pulse counter for energy meters, digital I/O interface.

The real time operating system Nut/OS is ported on the board.

Nut/OS is an intentionally simple RTOS for the ATmega128, which provides a minimum of services to run Nut/Net, the TCP/IP stack. Its features include:

• Non-preemptive multithreading.
  
  
• Events.
  
  
• Periodic and one-shot timers.
  
  
• Dynamic heap memory allocation.
  
  
• Interrupt driven streaming I/O.
  
  

Supported Equipment

• ZVLC
  
  
• MEPCO
  
  
• OPLC
  
  
• HWHC
  
  
• KW2104
  
  
• KW2108
  
  
• KYZ
  
  
• Preferred
  
  
• Sensor Phone
  
  
• RS-232 serial port with on-board DB-9 connector
  
  
• LED indicators for power supply, programming
  mode and Ethernet activity
  
  
• Single power supply DC 9-15V / 1A
  
  

Peripherals

• RS485 adapter;
  
  
• 3 opto-coupled digital inputs + 1 opto-coupled output.
  
  
• 1-wire interface for possible connection of
  temperature sensor
  
  
• 2 analog inputs.
  
  
• 32Kbytes EEPROM with I2C interface